CN110031429A - A kind of pH tester and test method - Google Patents
A kind of pH tester and test method Download PDFInfo
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- CN110031429A CN110031429A CN201910410181.8A CN201910410181A CN110031429A CN 110031429 A CN110031429 A CN 110031429A CN 201910410181 A CN201910410181 A CN 201910410181A CN 110031429 A CN110031429 A CN 110031429A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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Abstract
The invention discloses a kind of pH tester and test method, the pH tester includes prod, test pond and test substrate, wherein the prod includes light source, single mode optical fiber, photosensitive unit, processor and display screen；The test pond is used to accommodate the mixed liquor of nematic crystal and pH solution to be measured；The test substrate includes substrate, the gold thin film with groove direction being formed on the substrate and the inducing molecule being fixed in the gold thin film, for inducing the nematic liquid crystal molecules to align；Wherein the single mode optical fiber is configured as in the mixed liquor for protruding into test pond in test, the light of the light source outgoing is propagated in the single mode optical fiber, the light that single mode optical fiber is emitted is converted into electric signal through photosensitive unit, the pH value for obtaining pH solution to be measured is handled through processor, and is shown on a display screen.Embodiment high sensitivity provided by the invention, be not easy to be disturbed, small in size and production it is simple.
Description
Technical field
The present invention relates to pH the field of test technology, more particularly to a kind of pH tester and test method.
Background technique
Traditional pH test is mainly measured using glass electrode formula pH sensor and optical profile type pH sensor.Vitreous electricity
Pole formula pH sensor is using the potential difference of measurement pH solution to be measured and reference electrode come pH value determination, and there are impedances for this sensor
High, the shortcomings that volume is big, the high-alkali occasion measurement that is not suitable for peracid；Optical profile type pH sensor is then to utilize pH sensitive dye such as phenol
Red, methyl orange etc. is reacted with test substance, is then analyzed according to it the reflection of different wavelengths of light or outgoing efficiency difference
To its pH value, for this sensor vulnerable to ambient light interference, precision is not high；A kind of chemical modification pH sensing is also proposed in the prior art
Device, this sensor plated with sensitive chemical film on fiber core experience test substance pH value, according to sensitive under different pH value
The optical index of film is different, using the effect that suddenly dies, analyzes the available pH value of phase drift of emergent light.This sensor essence
Degree is high, but manufacture difficulty is big, and some high soda acid occasions lack suitable sensitive membrane.
Summary of the invention
At least one to solve the above-mentioned problems, first aspect present invention provides a kind of pH tester, including prod, survey
Pond and test substrate are tried, wherein
The prod includes light source, single mode optical fiber, photosensitive unit, processor and display screen；
The test pond is used to accommodate the mixed liquor of nematic crystal and pH solution to be measured；
The test substrate includes substrate, the gold thin film with groove direction being formed on the substrate and is fixed on institute
The inducing molecule in gold thin film is stated, for inducing the nematic liquid crystal molecules to align；
Wherein
The test substrate is sealingly disposed in the test pond in test and contacts with the mixed liquor；
The single mode optical fiber is configured as protruding into the mixed liquor in test, and the light of the light source outgoing is in the list
It is propagated in mode fiber；
The photosensitive unit is used to the light that the single mode optical fiber is emitted being converted to electric signal；
The processor is used to obtain the pH value of the pH solution to be measured according to the electric signal；
The display screen is for showing the pH value.
Further, the test pond includes
Cover board with the first opening, the single mode optical fiber protrude into the mixed liquor from first opening；
For accommodating the receiving portion of the mixed liquor of nematic crystal and pH solution to be measured；And
The pedestal being detachably connected with described accommodation section, the test substrate are sealingly disposed in the pedestal in test
It is upper to be contacted with the mixed liquor.
Further, the prod further includes the shell of the second opening, wherein the light source, photosensitive unit, processor
In the housing, the display screen is set on the shell for setting；
One end of the single mode optical fiber includes the covering of fibre core and cladding fibre core, and the other end has exposed fibre core, wherein
Described one end is protruded into the shell by second opening, is fixedly connected by the covering with the shell, described another
The exposed fibre core of one end protrudes into the mixed liquor, wherein the end of the other end has photo-emission part；
The pH tester further includes circulator, and the circulator includes first port, second port and third port,
In
The light that the light source is emitted is transmitted to the second port by the first port；
The light is totally reflected angle and imports the single mode optical fiber by the second port, and is received by the photo-emission part
The reflected light of reflection is guided through the third port to the photosensitive unit；
Or
The prod further includes the shell of the second opening, wherein the light source, photosensitive unit, processor are arranged described
In shell, the display screen is set on the shell；
The single mode optical fiber includes light incident side portion, light exit side portion and at least one bending part, wherein the light is incident
End and light exit side portion are protruded into the shell and are fixedly connected with the shell, the bending part by second opening
It protrudes into the mixed liquor.
Further, it is arranged on the shell:
Power switch key, for being powered on for tester；
Key is measured, for starting measurement；
Data switch key, the data shown for switching the tester.
Further, the prod further includes liquid crystal purifier, liquid crystal Storage Box, unidirectional quantitative hydraulic pump, the first list
To valve, second one-way valve, first pipe and second pipe, wherein
The nematic crystal is stored in liquid crystal the storage box, in test by the first pipe to the survey
It tries pond and the nematic crystal is provided；
First check valve is for controlling the nematic crystal unidirectionally by the first pipe；
Described in the unidirectional quantitative hydraulic pump is used to extracted from the test pond at the end of test by second pipe
Purified nematic crystal is quantitatively transferred in the liquid crystal the storage box to the liquid crystal purifier by nematic crystal；
The second one-way valve unidirectionally passes through the second pipe for controlling the nematic crystal.
Further, the test pond includes
Cover board with the first opening, first through hole and the second through-hole, wherein the single mode optical fiber is open from described first
It protrudes into the mixed liquor, the first pipe is protruded into the test pond by the first through hole, and the second pipe is logical
Second through-hole is crossed to protrude into the test pond to the test bottom of pond portion；
For accommodating the receiving portion of the mixed liquor of nematic crystal and pH solution to be measured, wherein have on the side wall of receiving portion
Liquid inlet, the liquid inlet are encapsulated with polyester film；And
The pedestal being detachably connected with described accommodation section, the test substrate are sealingly disposed in the pedestal in test
It is upper to be contacted with the mixed liquor.
Further, the prod further includes the shell of the second opening, third through-hole and fourth hole, wherein the light
Source, photosensitive unit, processor, liquid crystal purifier, liquid crystal Storage Box, the setting of unidirectional quantitative hydraulic pump are in the housing, described
Display screen is set on the shell；
One end of the single mode optical fiber includes the covering of fibre core and cladding fibre core, and the other end has exposed fibre core, wherein
Described one end is protruded into the shell by second opening, is fixedly connected by the covering with the shell, described another
The exposed fibre core of one end protrudes into the mixed liquor, wherein the end of the other end has photo-emission part；
The first pipe and second pipe pass through third through-hole respectively and fourth hole stretches out the shell；
The pH tester further includes circulator, and the circulator includes first port, second port and third port,
In
The light that the light source is emitted is transmitted to the second port by the first port；
The light is totally reflected angle and imports the single mode optical fiber by the second port, and is received by the photo-emission part
The reflected light of reflection is guided through the third port to the photosensitive unit；
Or
The prod further includes the shell of the second opening, third through-hole and fourth hole, wherein the light source, photosensitive list
In the housing, the display screen is arranged for member, processor, liquid crystal purifier, liquid crystal Storage Box, the setting of unidirectional quantitative hydraulic pump
In on the shell；
The single mode optical fiber includes light incident side portion, light exit side portion and at least one bending part, wherein the light is incident
End and light exit side portion are protruded into the shell and are fixedly connected with the shell, the bending part by second opening
It protrudes into the mixed liquor；
The first pipe and second pipe pass through third through-hole respectively and fourth hole stretches out the shell.
Further, it is arranged on the shell:
Power switch key, for being powered on for tester；
Key is measured, for starting measurement；
Data switch key, the data shown for switching the tester；
Liquid crystal injects key, provides the nematic crystal to the test pond for enabling the liquid crystal the storage box；
Liquid crystal extracts key, for starting the unidirectional quantitative hydraulic pump.
Further, the inducing molecule is that 16- dredges base cetyl acid, including-COOH group and-SH group.
Second aspect of the present invention provides a kind of test method using pH tester described in first aspect, comprising:
The test substrate is sealingly disposed in the test pond；
To the test pond according to predetermined amount injection nematic liquid crystal molecules and pH solution to be measured to form the mixed liquor,
Wherein the nematic liquid crystal molecules are aligned through the gold thin film and inducing molecule formation；
The single mode optical fiber of prod is protruded into the mixed liquor；
PH value is obtained after the numerical stability shown on device to be shown.
Further, the prod further includes liquid crystal purifier, liquid crystal Storage Box, unidirectional quantitative hydraulic pump, the first list
To valve, second one-way valve, first pipe and second pipe, wherein
The nematic crystal is stored in liquid crystal the storage box, in test by the first pipe to the survey
It tries pond and the nematic crystal is provided；
First check valve is for controlling the nematic crystal unidirectionally by the first pipe；
Described in the unidirectional quantitative hydraulic pump is used to extracted from the test pond at the end of test by second pipe
Purified nematic crystal is quantitatively transferred in the liquid crystal the storage box to the liquid crystal purifier by nematic crystal；
The second one-way valve unidirectionally passes through the second pipe for controlling the nematic crystal,
It is described to the test pond according to predetermined amount injection nematic liquid crystal molecules include: that the liquid crystal the storage box passes through institute
It states first pipe and provides the nematic crystal to the test pond；
After obtaining pH value, the test method further include:
The mixed liquor is extracted from the test pond by the second pipe to the liquid crystal purifier, and will purification
The nematic crystal crossed is delivered in the liquid crystal the storage box.
Beneficial effects of the present invention are as follows:
The present invention formulates a kind of pH tester and test method for existing problem at present, by single mode optical fiber with to
It is molten to sense pH to be measured using the effect that suddenly dies of the induction force effect and light of nematic crystal tested person substrate for the contact of column type liquid crystal
The pH value of liquid.Become according to the refractive index of nematic crystal caused by the mixed liquor for being mixed with nematic crystal and pH solution to be measured
Change, modulate the spectrum for the emergent light that the single mode optical fiber projects, optical signal is received by photosensitive element, carries out signal through processor
The pH value of pH solution to be measured described in real-time display on a display screen after processing, so that the problems of the prior art are compensated for, and
Have the characteristics that high sensitivity, be not easy to be disturbed, small in size and production it is simple.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows the structural schematic diagram of pH tester described in one embodiment of the present of invention；
Fig. 2 shows the structural formulas of inducing molecule described in one embodiment of the present of invention；
Fig. 3 shows the schematic diagram through inducing molecule treated test substrate described in one embodiment of the present of invention；
Fig. 4 shows the schematic diagram of evanescent wave of the single mode optical fiber described in one embodiment of the present of invention in nematic crystal；
Fig. 5 shows the schematic diagram of single mode optical fiber described in another embodiment of the invention；
Fig. 6 shows the structural schematic diagram of pH tester described in another embodiment of the invention；
Fig. 7 shows the flow chart of test method described in one embodiment of the present of invention.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
Liquid crystal is that a kind of fluid orderly with direction, the mobility of existing liquid, and birefringence for having crystal etc. are each
Anisotropy.According to its form and arrangement mode, liquid crystal can be divided into smectic type, cholesteric, nematic, wherein smectic crystal point
Son be in rodlike or strip, arrangement and move it is constrained larger, it is insensitive to external condition；Cholesteryl liquid crystal then has exclusive
Helicoidal structure has the optical properties such as optical activity, selective scattering and circular-dichroism；And nematic liquid crystal molecules
Rodlike in length, molecule is axially orderly, to extraneous condition responsive, makes it according to certain means (electricity, magnetic, alkyl compound etc.)
It arranges in certain direction, then display or senser element can be made.
Since the refractive index of nematic liquid crystal molecules is determined by the orientation of its molecule, thus inventor proposes, utilizes
Sensitive media of the nematic liquid crystal molecules as pH, as the pH for the mixed liquor for being mixed with nematic liquid crystal molecules and pH solution to be measured
Value change leads to nematic liquid crystal molecules position Xiang Bianhua, then changes the refractive index of nematic liquid crystal molecules, can then pass through
Single mode optical fiber experiences the variation of the refractive index, so as to obtain the pH value of pH solution to be measured.
As shown in Figure 1, An embodiment provides a kind of pH tester, including prod 10, test pond 20
And test substrate, wherein the prod 10 includes light source 11, single mode optical fiber 12, photosensitive unit 13, processor 14 and display
Screen 15；The test pond 20 is used to accommodate the mixed liquor of nematic crystal 21 and pH solution 25 to be measured；The test substrate includes
It substrate 22, the gold thin film (not depending on out in figure) with groove direction being formed on the substrate and is fixed in the gold thin film
Inducing molecule 24, for inducing the nematic liquid crystal molecules to align；Wherein the test substrate is sealed in test
Setting contacts in the test pond 20 with the mixed liquor；The single mode optical fiber 12 is configured as protruding into test described mixed
It closes in liquid, the light that the light source 11 is emitted is propagated in the single mode optical fiber 12；The photosensitive unit 13 is used for the single mode
The light that optical fiber 12 is emitted is converted to electric signal；The processor 14 for obtaining the pH solution to be measured according to the electric signal
PH value；The display screen 15 is for showing the pH value.
In an alternative embodiment, the test pond 20 includes the cover board 27 with the first opening 23, the single mode
Optical fiber 12 protrudes into the mixed liquor from first opening 23；For accommodating the mixed of nematic crystal 21 and pH solution 25 to be measured
Close the receiving portion 26 of liquid；And the pedestal 29 being detachably connected with described accommodation section 26, the test substrate 22 quilt in test
It is sealingly disposed on the pedestal 29 and is contacted with the mixed liquor.The cover board 27 is connect with receiving portion 26 by UV glue 28, institute
It states pedestal 29 to be threadedly coupled with 26 use of receiving portion, and is sealed between receiving portion 26 and pedestal 29 using O-ring seal 291.
In the present embodiment, the material of 29 three of described accommodation section 26, cover board 27 and pedestal is not react with nematic liquid crystal molecules
Glass, can it is identical, can also be different, for example, Corning Incorporated production Gorilla Glass (gorilla glass), should
Glass is environment-friendly type aluminium silicon tempered glass.
In a specific example, as shown in Figure 1, testing the pH value of pH solution to be measured according to the following steps:
Firstly, pedestal 29 is arranged in test pond 20, test substrate, the test substrate packet are set on the pedestal 29
Include substrate 22, the gold thin film (not depending on out in figure) with groove direction that is formed in the substrate 22 and to be fixed on the gold thin
Inducing molecule 24 on film.
The substrate 22 is silica, and it is thin that one layer of gold with certain groove direction is sprayed on the silica
Film is fixed with inducing molecule 24 in the gold thin film.The gold thin film with certain groove direction is to nematic liquid crystal molecules
With mooring forces effect.As shown in Fig. 2, the inducing molecule is that 16- dredges base cetyl acid, the 16- dredges base cetyl
Acid be silylating reagent assembling film, ordered liquid crystal molecule can be induced to arrange, especially when in reagent carbon atom number be greater than 12
When can induce liquid crystal molecule vertical arrangement.It includes-COOH group and-SH group that the 16-, which dredges base cetyl acid, wherein institute
Stating-COOH is faintly acid group, can be changed with pH value, the ion concentration of mixed liquor, which will ionize, therefore can
Using the indicator by the group as test pH value；The backbone of 16- mercaptohexadecanoic base acid and-COOH group can make to
Column type liquid crystal molecule vertical arrangement.- SH the group is fixed on the substrate 22 for 16- to be dredged base cetyl acid, such as
Fig. 3 show the substrate that the processing of base cetyl acid is dredged through 16-, and the nematic liquid crystal molecules are by 16- mercaptohexadecanoic base
The induction vertical arrangement of the backbone of acid and-COOH group, in the present embodiment, the nematic liquid crystal molecules are 5CB liquid
Brilliant molecule.
Secondly, injecting nematic crystal 21 and pH to be measured according to predetermined amount to the test pond respectively by the first opening 23
Solution 25 simultaneously forms mixed liquor, and the nematic crystal 21 is aligned through the gold thin film and inducing molecule formation.
The nematic crystal 21 that predetermined amount is injected to test pond 20, in the mooring forces and inducing molecule of the gold thin film of substrate 22
Under the collective effect of 24 induction force, the arrangement position of the nematic crystal 21 is to showing as y-axis as described in Figure 1 and horizontal x
Axis arranges at an angle, and the nematic crystal 21 is smaller apart from the remoter suffered mooring forces of the substrate 22 and induction force,
The angle more tends to horizontal.It is then injected into pH solution 25 to be measured, nematic crystal 21 and the pH solution 25 to be measured are mixed
Form mixed liquor.Due to 16- mercaptohexadecanoic base acid-COOH group is weak acid group, with being mixed with pH solution to be measured
The pH value change of mixed liquor will ionize, and according to pH value difference, then degree of ionization is also different, leads to part 16- mercaptohexadecanoic
Base acid molecule loses inducing action to nematic liquid crystal molecules, and nematic crystal is by gold thin film mooring forces and relatively smaller at this time
The effect of 16- mercaptohexadecanoic base acid molecule induction force, position will be to will change.Due to the refractive index and its liquid crystal of nematic crystal
The molecules align form of molecule is related, thus phase will occur for the variation of the pH value with mixed liquor, the refractive index of nematic crystal
It should change.
In view of the evanescent wave variation that pH solution itself ion motion to be measured also results in, in an optional embodiment
In, the volume ratio of the nematic liquid crystal molecules and the pH solution to be measured is greater than 5, then can exclude because of pH solution itself to be measured
Influence of the ion motion to evanescent wave.
Finally, single mode optical fiber 12, which is inserted into the mixed liquor, carries out pH value detection to the pH solution 25 to be measured, and will inspection
The pH value of survey is shown on display screen 15.
As shown in Figure 1, showing the pH value of the pH solution 25 to be measured on the display screen 15: pH 10.23 is with completion pair
The test of the pH value of the pH solution 25 to be measured.I.e. by single mode optical fiber 12 with the effect that suddenly dies and can by induced alignment to
Column type liquid crystal 21 realizes the detection to the pH value of pH solution 25 to be measured, to solve problems of the prior art.In this reality
It applies in example, it is contemplated that the thermal expansion coefficient of silica fibre is minimum, and the single mode optical fiber 12 is single-mode quartz optical fibers.
Specifically, when the effect that suddenly dies refers to that light is totally reflected from optically denser medium fibre core directive optically thinner medium covering,
Not only there is back wave, the transmitted wave (i.e. evanescent wave) exponentially decayed there is also amplitude.As shown in figure 4, wherein along optical fiber
Wave after axial direction is propagated is evanescent wave, and the energy of evanescent wave is decayed with exponential form, and after propagating a distance, energy will
Along reflection light direction return light fibre.In general, defining evanescent wave amplitude decays to normal direction corresponding to the 37% of interface amplitude
Distance is the penetration depth dp of evanescent wave:
In formula, λ is optical wavelength, n1For fiber core refractive index, n2For cladding index, θ is angle of light, can by formula (1)
Know, dpRelated to refractive index and incidence angle, incidence angle is smaller, and fibre core and cladding index difference are smaller, and penetration depth is bigger.
For improve the single mode optical fiber evanescent wave sensitivity, in an alternative embodiment, as shown in Figure 1, institute
The shell 18 that prod further includes the second opening 19 is stated, wherein the light source 11, photosensitive unit 13, processor 14 are arranged described
In shell 18, the display screen 15 is set on the shell 18；One end of the single mode optical fiber 12 includes fibre core 121 and cladding
The covering 122 of fibre core, the other end have exposed fibre core 121, wherein described one end protruded by second opening 19 it is described
In shell 18, it is fixedly connected by the covering 122 with the shell 18, the exposed fibre core 121 of the other end protrudes into institute
It states in mixed liquor, wherein the end of the other end has photo-emission part 17；The pH tester further includes circulator 16, described
Circulator 16 includes first port 1, second port 2 and third port 3, wherein the light source 11 is emitted by the first port 1
Light be transmitted to the second port 2；The light is totally reflected angle and imports the single mode optical fiber 12 by the second port 2,
And the reflected light reflected by the photo-emission part 17 is received, through the third port 3 guidance to the photosensitive unit 13.
Specifically, the light that the light source 11 is emitted enters from the first port 1 of circulator 16 and by second port 2 to be all-trans
Firing angle degree enters the single mode optical fiber 12, reflects through the photo-emission part 17 and generates reflected light, and the reflected light enters circulator
16 second port 2 simultaneously enters the photosensitive unit 13 by third port 3 with vertical angle.The light of the i.e. described light source outgoing is with complete
Reflection angle enters single mode optical fiber, since there are refringences between the fibre core 121 and mixed liquor, causes in single mode optical fiber
The light of transmission generates evanescent wave in transmission process, i.e., improves institute by reducing fibre core and extraneous refringence according to formula 1
The sensitivity of the evanescent wave of single mode optical fiber is stated, the light of transmission and the spectrum of reflected light are modulated to realize.It is last photosensitive
Received reflected light is converted to electric signal by unit 13, then is transmitted to the processor 14, carries out signal through the processor 14
Processing, calculating can be obtained the pH value to pH solution to be measured, and test result shown on display screen 15, to realize
Detection to pH solution ph to be measured.I.e..In the present embodiment, the shell 18 is the polymer comprising PVC, the single-mode optics
Fibre 12 is fixed on the housing by silicone adhesive；The photo-emission part 17 is reflective film.
In the present embodiment, the covering 122 of single mode optical fiber 12 is removed by substances such as hydrofluoric acid, is directly placed into mixed liquor
Tested, i.e., will be changed to the biggish covering of fiber core refractive index difference with the lesser mixed liquor of fiber core refractive index difference, to reduce
Fibre core and extraneous refringence.Assuming that the refractive index in the region (i.e. mixed liquor) of filling covering is nj, when the ph value of mixed liquor
Variation leads to refractive index njChange and directly affects dpVariation, and then influence the time that evanescent wave energy returns to fibre core, to eventually lead to
The spectrum of the evanescent wave of optical fiber drifts about.The spectrum that the evanescent wave is detected by photosensitive unit 13 analyzes the saturating of the spectrum
Peak or loss peak are penetrated, can be obtained the variation of the refractive index of filling region, pH solution to be measured can be obtained by processor calculating
PH value, to realize the detection to the pH value of pH solution to be measured.Specific step is as follows:
First, optical signal is emitted from light source, through circulator to be totally reflected angle into the single mode optical fiber, in the mixing
The reflective film reflection that optical signal described in liquid passes through positioned at end of the single mode optical fiber far from light source side generates reflected light letter
Number.
As shown in Figure 1, light source 11 issues wavelength 1300-1680nm broadband optical signal, in the present embodiment, the light source 11
For LED light source, injected from the first port of circulator 16, second port projects, the optical signal of outgoing with the single mode optical fiber
The angle that the angle sine value of 12 121 axis of fibre core is less than fiber numerical aperture injects the fibre core 121 of single mode optical fiber 12, in fibre
The interior onwards transmission in a manner of total reflection of core 121.In total reflection transmission process, due to the effect that suddenly dies, passed in the fibre core 121
Defeated optical signal can experience the refractive index of mixed liquor, the evanescent wave sphere of action as described in the dotted portion on Fig. 4 is, and
And the evanescent wave is wider in the partial action range of no covering 122.In the present embodiment, the pH solution 25 to be measured with it is described
Nematic crystal 21 in test pond is mixed to form mixed liquor, and the pH value variation of the mixed liquor influences to be located at the test pond bottom
The gold thin film and inducing molecule 24 of the test substrate 22 in portion to the position of the nematic crystal 21 to arrangement, thus change it is described to
The refractive index of column type liquid crystal 21.The optical signal is propagated forward in the single mode optical fiber 12, is encountered positioned at the single mode optical fiber
The photo-emission part 17 of end far from light source side generates reflected light signal, and the photo-emission part is that reflection is thin in the present embodiment
Film, HfO specially with high reflectivity2-SiO2Bilayer film, wherein HfO2For internal layer membrane, SiO2For outer membrane,
The top of the test department of the fibre core 121 far from interconnecting piece side is plated in by magnetron sputtering technique, the reflected light signal exists
Evanescent wave will be also generated when transmitting in optical fiber, which continues to sense the refractive index of nematic crystal described in mixed liquor, root
According to the penetration range d of evanescent wave described in the refraction index changingp, and then the spectrum of the evanescent wave is modulated.
Second, the reflected light signal is transmitted to circulator 16 through the single mode optical fiber 12, through the circulator 16 to hang down
Squareness is transmitted to the photosensitive unit 13；The photosensitive unit 13 exports electric signal according to the reflected light signal and is transmitted to
Processor 14.
The reflected light signal is projected from the fibre core 121 of single mode optical fiber 12, into the second port of the circulator 16, by
It in the one-way transmission of circulator 16, is projected from the third port of circulator 16, and vertical transfer is to the photosensitive unit 13, at this
Photosensitive unit described in embodiment is 1/3 inch of area array CCD photosensitive unit, and the chip that is internally integrated of the photosensitive unit 13 will be anti-
It penetrates optical signal and is converted to analog electrical signal, be converted to electric signal input processing through amplifying circuit, address decoder, analog-digital converter
In device 14.
Third, the processor 14 obtain the pH value of the pH solution 25 to be measured according to the electric signal and are shown in described
On display screen 15.
The processor 14 carries out signal processing to the electric signal, analyzes the damage of the outgoing optical signal of the single mode optical fiber
Peak drift time is consumed, the corresponding relationship of the pH value of pH solution to be measured and the drift time of outgoing optical signal is obtained by fitting, from
And obtain the pH value of the pH solution to be measured and be shown on the display screen 15, " pH 10.23 " as shown in Figure 1, thus real
Now to the detection of the pH value of pH solution to be measured.
It is worth noting that in the present embodiment, the folding of the optical signal and reflected light signal by the mixed liquor
Penetrating rate variation leads to the spectrum change of the optical signal and reflected light signal, can further increase suddenly dying for the single mode optical fiber
The sensitivity of wave.
For the sensitivity of the evanescent wave of the raising single mode optical fiber, in another alternative embodiment, the prod
It further include the shell 18 of the second opening 19, wherein the light source 11, photosensitive unit 13, processor 14 are arranged in the shell 18
In, the display screen 15 is set on the shell 18；The single mode optical fiber 12 includes light incident side portion 123, light exit side portion
124 and at least one bending part 125, wherein the light incident side portion and light exit side portion protrude into institute by second opening 19
It states in shell and is fixedly connected with the shell, the bending part 125 protrudes into the mixed liquor.
In a specific example, as shown in figure 5, the single mode optical fiber 12 is U-shaped optical fiber.Optical signal goes out from light source 11
It penetrates, the light incident side portion 123 of the single mode optical fiber 12 is entered with incident light, through the mixed liquor from the light of the single mode optical fiber 12
It is emitted end 124 and exports emergent light, the emergent light is vertically into the photosensitive unit 13；The photosensitive unit 13 is according to described
The optical signal output electric signal of emergent light is simultaneously transmitted to processor 14；The processor 14 obtain according to the electric signal it is described to
It surveys the pH value of pH solution and is shown on the display screen 15.
The incident light that i.e. light source 11 issues is injected from the light incident side portion 123 of U-shaped optical fiber, according to formula 1, in U-shaped optical fiber
In, the incidence angle of optical signal is variable, and transmits in the optical fiber with bending part, and the incidence angle gradually becomes smaller, described
Evanescent wave in test pond becomes larger with becoming smaller for incidence angle, and then evanescent wave penetration depth is caused to become larger, and modulates institute
The spectrum of optical signal is stated, the last optical signal is projected from the light exit side portion 124 of U-shaped optical fiber, and the emergent light band of injection needs
The sensing signal for surveying the pH value of pH solution 25, is converted to electric signal into photosensitive unit 13 and by photosensitive unit 13, then be transmitted to
The processor 14 can be obtained the pH value to pH solution 25 to be measured through the processor 14 progress signal processing, calculating,
And show test result on a display screen, to realize the detection to the pH value of pH solution 25 to be measured.
In the present embodiment, the photosensitive unit 13 is CCD photosensitive unit, perpendicular to the light exit side of the U-shaped optical fiber
Portion 124, vertically into the CCD photosensitive unit, the photosensitive unit 13 will be reflected the emergent light by being internally integrated chip
Optical signal is converted to analog electrical signal, is converted to electric signal input processor through amplifying circuit, address decoder, analog-digital converter
In 14.In view of the size of whole pH tester, the present embodiment uses 1/3 inch of area array CCD photosensitive unit, those skilled in the art
Member should select the photosensitive unit of appropriate size according to practical application scene, and to meet actual demand, details are not described herein.
In view of the ease of use of the pH tester, in an alternative embodiment, it is arranged on the shell: electricity
Source switch key, for being powered on for tester；Key is measured, for starting measurement；Data switch key, it is aobvious for switching the tester
The data shown.
Specifically, the pH tester realizes the function to the triggering of the function button on the shell in response to test man
The corresponding function of energy key, such as be powered on by " power switch key " for tester to open the pH tester, pass through " measurement
Key " starting measures the measurement to realize the pH value to pH solution to be measured, and it is aobvious to switch the pH tester by " data switch key "
The data shown.
Since the pH solution to be measured is mixed into the nematic crystal to form mixed liquor, the nematic crystal without
Method is reused.In order to reuse the pH tester, need the mixed liquor discharge in the test pond replacing the survey
Try substrate.It repeats the above steps when testing again, injects nematic crystal and pH solution to be measured is detected.
For the reuse convenient for the pH tester, as shown in fig. 6, in an alternative embodiment, the test
Stick 10 further includes liquid crystal purifier 31, liquid crystal Storage Box 32, unidirectional quantitative hydraulic pump 33, the first check valve 34, second one-way valve
35, first pipe 36 and second pipe 37 are wherein stored with the nematic crystal in liquid crystal the storage box 32, in test
The nematic crystal is provided to the test pond 20 by the first pipe 36；First check valve 34 is for controlling institute
Nematic crystal is stated unidirectionally by the first pipe 36；The unidirectional quantitative hydraulic pump 33 is used at the end of test by the
Two pipelines 37 extract the nematic crystal to the liquid crystal purifier 31 from the test pond 20, and by purified nematic
Type liquid crystal is quantitatively transferred in the liquid crystal the storage box 32；The second one-way valve 35 is unidirectional for controlling the nematic crystal
Pass through the second pipe 37.
In an alternative embodiment, the test pond 20 includes having the first opening, first through hole 41 and second logical
The cover board in hole 42, wherein the single mode optical fiber protrudes into the mixed liquor from first opening, the first pipe 36 passes through
The first through hole 41 protrudes into the test pond 20, and the second pipe 37 protrudes into the test by second through-hole 42
To the test bottom of pond portion in pond 20；For accommodating the receiving portion of the mixed liquor of nematic crystal and pH solution to be measured, wherein holding
Receiving has liquid inlet 43 on the side wall in portion, and the liquid inlet is encapsulated with polyester film；And it is detachably connected with described accommodation section
Pedestal, the test substrate contacts with the mixed liquor in test by sealed set on the base.
In a specific embodiment, as shown in fig. 6, after the pH tester completes primary test, by described
Mixed liquor in the test pond 20 is transmitted to the liquid crystal by second pipe 37, the second liquid crystal through-hole 42 and second one-way valve 35
Purifier 31.Then, nematic crystal and pH solution to be measured in the mixed liquor are separated using the liquid crystal purifier 31, it will
Nematic crystal after separation is stored in the liquid crystal Storage Box 32, in the present embodiment, pre- in the liquid crystal the storage box 32
A large amount of nematic crystal is first stored, such as storage 10 times measure required nematic crystal.When needing to carry out new test
When, using the unidirectional quantitative hydraulic pump 33 by the first pipe 36, the first liquid crystal through-hole 41 and the first check valve 34 from
The nematic crystal is exported to the test pond, the unidirectional quantitative hydraulic pump according to predetermined amount in the liquid crystal Storage Box 32
33 provide the power by the nematic crystal according to predetermined amount injection test pond 20, the first check valve 34 and second one-way valve 35
For unidirectional single-pass, prevent adverse current from destroying the purity of the nematic crystal.In the present embodiment, the pH solution to be measured passes through survey
It tries setting liquid inlet 43 on pond and injects test pond, the liquid inlet 43 is encapsulated with polyester film, and the polyester film is specially PET
Film, the liquid inlet are sealed by PET film, pH solution to be measured can be injected the test pond from liquid inlet by needle tubing,
To be mixed to form mixed liquor with nematic liquid crystal molecules.So far the pH tester has been prepared for carrying out new test, example
Test pond and the nematic crystal are mixed to form mixed liquor as described in by pH solution to be measured injection, and the single mode optical fiber is inserted
Enter the test pond, repeats the above steps to realize the pH test value of the pH solution to be measured.
For improve the single mode optical fiber evanescent wave sensitivity, in an alternative embodiment, as shown in fig. 6, institute
State the shell that prod further includes the second opening, third through-hole and fourth hole, wherein the light source, photosensitive unit, processor,
In the housing, the display screen is set to the shell for liquid crystal purifier, liquid crystal Storage Box, the setting of unidirectional quantitative hydraulic pump
On；One end of the single mode optical fiber includes the covering of fibre core and cladding fibre core, and the other end has exposed fibre core, wherein described one
End is protruded into the shell by second opening, is fixedly connected by the covering with the shell, the other end
Exposed fibre core protrudes into the mixed liquor, wherein the end of the other end has photo-emission part；The first pipe and
Two pipelines pass through third through-hole respectively and fourth hole stretches out the shell；The pH tester further includes circulator, the ring
Shape device includes first port, second port and third port, wherein the light that the light source is emitted is transmitted to by the first port
The second port；The light is totally reflected angle and imports the single mode optical fiber by the second port, and is received by the light
The reflected light of reflecting part reflection, guides through the third port to the photosensitive unit.The specific embodiment of the present embodiment with
Embodiment in above-described embodiment by existing refringence between fibre core and mixed liquor is similar, and those skilled in the art answer
Work as understanding, be configured according to actual needs, details are not described herein.
For the sensitivity of the evanescent wave of the raising single mode optical fiber, in another alternative embodiment, the prod
It further include the shell of the second opening, third through-hole and fourth hole, wherein the light source, photosensitive unit, processor, liquid crystal purify
In the housing, the display screen is set on the shell for device, liquid crystal Storage Box, the setting of unidirectional quantitative hydraulic pump；It is described
Single mode optical fiber includes light incident side portion, light exit side portion and at least one bending part, wherein the light incident side portion and light outgoing
End is protruded into the shell and is fixedly connected with the shell by second opening, and the bending part protrudes into the mixing
In liquid；The first pipe and second pipe pass through third through-hole respectively and fourth hole stretches out the shell.The present embodiment
The implementation for causing evanescent wave to become larger is gradually become smaller by incidence angle in U-shaped optical fiber in specific embodiment and above-described embodiment
Mode is similar, it will be appreciated by those skilled in the art that being configured according to actual needs, details are not described herein.
In view of the ease of use of the pH tester, in an alternative embodiment, it is arranged on the shell: electricity
Source switch key, for being powered on for tester；Key is measured, for starting measurement；Data switch key, it is aobvious for switching the tester
The data shown；Liquid crystal injects key, provides the nematic crystal to the test pond for enabling the liquid crystal the storage box；Liquid crystal
Key is extracted, for starting the unidirectional quantitative hydraulic pump.
Specifically, the pH tester realizes the function to the triggering of the function button on the shell in response to test man
The corresponding function of energy key, such as be powered on by " power switch key " for tester to open the pH tester, pass through " measurement
Key " starting measures the measurement to realize the pH value to pH solution to be measured, and it is aobvious to switch the pH tester by " data switch key "
The data shown are exported nematic crystal according to predetermined amount to the test by " liquid crystal injection key " from liquid crystal Storage Box
Pond can also start the unidirectional quantitative hydraulic pump by passing through " liquid crystal extraction key " after terminating test to extract from test pond
Mixed liquor, and by the nematic crystal separating-purifying in mixed liquor and be stored in liquid crystal Storage Box using liquid crystal purifier.
Corresponding with pH tester provided by the above embodiment, one embodiment of the application also provides a kind of using above-mentioned
The test method of pH tester, since the pH that test method provided by the embodiments of the present application and above-mentioned several embodiments provide is tested
Instrument is corresponding, therefore is also applied for test method provided in this embodiment in aforementioned embodiments, in the present embodiment no longer in detail
Thin description.
As shown in fig. 7, one embodiment of the application also provides a kind of test method using above-mentioned pH tester, packet
It includes: the test substrate is sealingly disposed in the test pond；Nematic crystal is injected according to predetermined amount to the test pond
Molecule and pH solution to be measured are to form the mixed liquor, wherein the nematic liquid crystal molecules are through the gold thin film and inducing molecule
Formation aligns；The single mode optical fiber of prod is protruded into the mixed liquor；It is obtained after the numerical stability shown on device to be shown
PH value.
In another alternative embodiment, the prod further includes liquid crystal purifier, liquid crystal Storage Box, unidirectionally quantifies
Hydraulic pump, the first check valve, second one-way valve, first pipe and second pipe, be wherein stored in liquid crystal the storage box it is described to
Column type liquid crystal, for providing the nematic crystal to the test pond by the first pipe in test；Described first
Check valve is for controlling the nematic crystal unidirectionally by the first pipe；The unidirectional quantitative hydraulic pump is for testing
At the end of the nematic crystal extracted to the liquid crystal purifier from the test pond by second pipe, and will be purified
Nematic crystal be quantitatively transferred in the liquid crystal the storage box；The second one-way valve is for controlling the nematic crystal list
To by the second pipe, described to the test pond includes: the liquid crystal according to predetermined amount injection nematic liquid crystal molecules
The storage box provides the nematic crystal to the test pond by the first pipe；After obtaining pH value, the test
Method further include: extract the mixed liquor from the test pond by the second pipe to the liquid crystal purifier, and will
Purified nematic crystal is delivered in the liquid crystal the storage box.The i.e. described pH tester can be realized reuse.
The present invention formulates a kind of pH tester and test method for existing problem at present, by single mode optical fiber with to
It is molten to sense pH to be measured using the effect that suddenly dies of the induction force effect and light of nematic crystal tested person substrate for the contact of column type liquid crystal
The pH value of liquid.Become according to the refractive index of nematic crystal caused by the mixed liquor for being mixed with nematic crystal and pH solution to be measured
Change, modulate the spectrum for the emergent light that the single mode optical fiber projects, optical signal is received by photosensitive element, carries out signal through processor
The pH value of pH solution to be measured described in real-time display on a display screen after processing, so that the problems of the prior art are compensated for, and
Have the characteristics that high sensitivity, be not easy to be disturbed, small in size and production it is simple.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (11)
1. a kind of pH tester, which is characterized in that including prod, test pond and test substrate, wherein
The prod includes light source, single mode optical fiber, photosensitive unit, processor and display screen；
The test pond is used to accommodate the mixed liquor of nematic crystal and pH solution to be measured；
The test substrate includes substrate, the gold thin film with groove direction being formed on the substrate and is fixed on the gold
Inducing molecule on film, for inducing the nematic liquid crystal molecules to align；
Wherein
The test substrate is sealingly disposed in the test pond in test and contacts with the mixed liquor；
The single mode optical fiber is configured as protruding into the mixed liquor in test, and the light of the light source outgoing is in the single-mode optics
It is propagated in fibre；
The photosensitive unit is used to the light that the single mode optical fiber is emitted being converted to electric signal；
The processor is used to obtain the pH value of the pH solution to be measured according to the electric signal；
The display screen is for showing the pH value.
2. pH tester according to claim 1, which is characterized in that the test pond includes
Cover board with the first opening, the single mode optical fiber protrude into the mixed liquor from first opening；
For accommodating the receiving portion of the mixed liquor of nematic crystal and pH solution to be measured；And
The pedestal being detachably connected with described accommodation section, the test substrate test when by sealed set on the base with
The mixed liquor contact.
3. pH tester according to claim 1 or 2, which is characterized in that
The prod further includes the shell of the second opening, wherein the light source, photosensitive unit, processor are arranged in the shell
In, the display screen is set on the shell；
One end of the single mode optical fiber includes the covering of fibre core and cladding fibre core, and the other end has exposed fibre core, wherein described
One end is protruded into the shell by second opening, is fixedly connected by the covering with the shell, the other end
Exposed fibre core protrude into the mixed liquor, wherein the end of the other end have photo-emission part；
The pH tester further includes circulator, and the circulator includes first port, second port and third port, wherein
The light that the light source is emitted is transmitted to the second port by the first port；
The light is totally reflected angle and imports the single mode optical fiber by the second port, and is received and reflected by the photo-emission part
Reflected light, guide through the third port to the photosensitive unit；
Or
The prod further includes the shell of the second opening, wherein the light source, photosensitive unit, processor are arranged in the shell
In, the display screen is set on the shell；
The single mode optical fiber includes light incident side portion, light exit side portion and at least one bending part, wherein the light incident side portion
It is protruded into the shell with light exit side portion by second opening and is fixedly connected with the shell, the bending part protrudes into
In the mixed liquor.
4. pH tester according to claim 3, which is characterized in that be arranged on the shell:
Power switch key, for being powered on for tester；
Key is measured, for starting measurement；
Data switch key, the data shown for switching the tester.
5. pH tester according to claim 1, which is characterized in that
The prod further includes liquid crystal purifier, liquid crystal Storage Box, unidirectional quantitative hydraulic pump, the first check valve, second unidirectional
Valve, first pipe and second pipe, wherein
The nematic crystal is stored in liquid crystal the storage box, in test by the first pipe to the test pond
The nematic crystal is provided；
First check valve is for controlling the nematic crystal unidirectionally by the first pipe；
The unidirectional quantitative hydraulic pump is used to extract the nematic from the test pond by second pipe at the end of test
Purified nematic crystal is quantitatively transferred in the liquid crystal the storage box to the liquid crystal purifier by type liquid crystal；
The second one-way valve unidirectionally passes through the second pipe for controlling the nematic crystal.
6. according to right want 5 described in pH tester, which is characterized in that the test pond includes
Cover board with the first opening, first through hole and the second through-hole, wherein the single mode optical fiber is protruded into from first opening
In the mixed liquor, the first pipe is protruded into the test pond by the first through hole, and the second pipe passes through institute
The second through-hole is stated to protrude into the test pond to the test bottom of pond portion；
For accommodating the receiving portion of the mixed liquor of nematic crystal and pH solution to be measured, wherein have on the side wall of receiving portion into liquid
Mouthful, the liquid inlet is encapsulated with polyester film；And
The pedestal being detachably connected with described accommodation section, the test substrate test when by sealed set on the base with
The mixed liquor contact.
7. pH tester according to claim 5 or 6, which is characterized in that
The prod further includes the shell of the second opening, third through-hole and fourth hole, wherein the light source, photosensitive unit,
In the housing, the display screen is set to for processor, liquid crystal purifier, liquid crystal Storage Box, the setting of unidirectional quantitative hydraulic pump
On the shell；
One end of the single mode optical fiber includes the covering of fibre core and cladding fibre core, and the other end has exposed fibre core, wherein described
One end is protruded into the shell by second opening, is fixedly connected by the covering with the shell, the other end
Exposed fibre core protrude into the mixed liquor, wherein the end of the other end have photo-emission part；
The first pipe and second pipe pass through third through-hole respectively and fourth hole stretches out the shell；
The pH tester further includes circulator, and the circulator includes first port, second port and third port, wherein
The light that the light source is emitted is transmitted to the second port by the first port；
The light is totally reflected angle and imports the single mode optical fiber by the second port, and is received and reflected by the photo-emission part
Reflected light, guide through the third port to the photosensitive unit；
Or
The prod further includes the shell of the second opening, third through-hole and fourth hole, wherein the light source, photosensitive unit,
In the housing, the display screen is set to for processor, liquid crystal purifier, liquid crystal Storage Box, the setting of unidirectional quantitative hydraulic pump
On the shell；
The single mode optical fiber includes light incident side portion, light exit side portion and at least one bending part, wherein the light incident side portion
It is protruded into the shell with light exit side portion by second opening and is fixedly connected with the shell, the bending part protrudes into
In the mixed liquor；
The first pipe and second pipe pass through third through-hole respectively and fourth hole stretches out the shell.
8. pH tester according to claim 7, which is characterized in that be arranged on the shell:
Power switch key, for being powered on for tester；
Key is measured, for starting measurement；
Data switch key, the data shown for switching the tester；
Liquid crystal injects key, provides the nematic crystal to the test pond for enabling the liquid crystal the storage box；
Liquid crystal extracts key, for starting the unidirectional quantitative hydraulic pump.
9. pH tester according to claim 1, which is characterized in that the inducing molecule is that 16- dredges base cetyl acid,
Including-COOH group and-SH group.
10. a kind of test method using pH tester described in claim 1 characterized by comprising
The test substrate is sealingly disposed in the test pond；
Nematic liquid crystal molecules and pH solution to be measured are injected to form the mixed liquor according to predetermined amount to the test pond, wherein
The nematic liquid crystal molecules are aligned through the gold thin film and inducing molecule formation；
The single mode optical fiber of prod is protruded into the mixed liquor；
PH value is obtained after the numerical stability shown on device to be shown.
11. test method according to claim 10, which is characterized in that
The prod further includes liquid crystal purifier, liquid crystal Storage Box, unidirectional quantitative hydraulic pump, the first check valve, second unidirectional
Valve, first pipe and second pipe, wherein
The nematic crystal is stored in liquid crystal the storage box, in test by the first pipe to the test pond
The nematic crystal is provided；
First check valve is for controlling the nematic crystal unidirectionally by the first pipe；
The unidirectional quantitative hydraulic pump is used to extract the nematic from the test pond by second pipe at the end of test
Purified nematic crystal is quantitatively transferred in the liquid crystal the storage box to the liquid crystal purifier by type liquid crystal；
The second one-way valve unidirectionally passes through the second pipe for controlling the nematic crystal,
It is described that include: the liquid crystal the storage box according to predetermined amount injection nematic liquid crystal molecules to the test pond pass through described the
One pipeline provides the nematic crystal to the test pond；
After obtaining pH value, the test method further include:
The mixed liquor is extracted from the test pond by the second pipe to the liquid crystal purifier, and will be purified
Nematic crystal is delivered in the liquid crystal the storage box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410181.8A CN110031429A (en) | 2019-05-17 | 2019-05-17 | A kind of pH tester and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910410181.8A CN110031429A (en) | 2019-05-17 | 2019-05-17 | A kind of pH tester and test method |
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| CN110031429A true CN110031429A (en) | 2019-07-19 |
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| CN201910410181.8A Pending CN110031429A (en) | 2019-05-17 | 2019-05-17 | A kind of pH tester and test method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568946A (en) * | 2015-01-23 | 2015-04-29 | 中国农业大学 | Intelligent optical fiber pH sensor |
| CN106644959A (en) * | 2016-12-06 | 2017-05-10 | 中国农业大学 | Evanescent wave coupling humidity sensing optical fiber and preparation method thereof |
| KR20180021482A (en) * | 2016-08-22 | 2018-03-05 | 경북대학교 산학협력단 | pH sensitive nematic liquid crystal double emulsion droplet and preperation method thereof |
| TW201821597A (en) * | 2016-12-07 | 2018-06-16 | 淡江大學 | Liquid crystal composition and pH sensing device applying thereof |
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2019
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|---|---|---|---|---|
| CN104568946A (en) * | 2015-01-23 | 2015-04-29 | 中国农业大学 | Intelligent optical fiber pH sensor |
| KR20180021482A (en) * | 2016-08-22 | 2018-03-05 | 경북대학교 산학협력단 | pH sensitive nematic liquid crystal double emulsion droplet and preperation method thereof |
| CN106644959A (en) * | 2016-12-06 | 2017-05-10 | 中国农业大学 | Evanescent wave coupling humidity sensing optical fiber and preparation method thereof |
| TW201821597A (en) * | 2016-12-07 | 2018-06-16 | 淡江大學 | Liquid crystal composition and pH sensing device applying thereof |
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