CN110174373A - A kind of polymer waveguide explosive gas sensor based on polycarbonate - Google Patents
A kind of polymer waveguide explosive gas sensor based on polycarbonate Download PDFInfo
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- CN110174373A CN110174373A CN201910460222.4A CN201910460222A CN110174373A CN 110174373 A CN110174373 A CN 110174373A CN 201910460222 A CN201910460222 A CN 201910460222A CN 110174373 A CN110174373 A CN 110174373A
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- explosive gas
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- 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 present invention discloses a kind of polymer waveguide explosive gas sensor based on polycarbonate and is unfavorable for practical application for the problem that sensitive polymer material used in existing polymer waveguide explosive gas sensor since the hole smaller response time is longer；Sensitive layer of the present invention using the porous polycarbonate of side chain chromophore containing dipole as explosives sensor, dipole chromophore in hole can rapidly adsorb the nitro explosive gas of electron deficient, the refractive index of film is set to change, in conjunction with the asymmetrical Mach-Zehnder interferometers structure of two-arm width, a kind of novel light wave derivative sensor is obtained, has structure simple, is easily integrated, the advantages that detectivity is high, fast response time and electromagnetism interference.
Description
Technical field
The invention belongs to optical waveguide sensory field, in particular to a kind of poly- carbonic acid of the electric light of side chain chromophore architectures containing dipole
Application of the ester material in the gas sensor of Mach-Zehnder interferometers structure.
Background technique
In informationized society, sensing technology has been widely applied to every field, such as food safety, environmental monitoring, work
People's lives are produced important influence by industry production etc..Sensing technology is grown rapidly with science, is widely used in the mankind
Social production and scientific research in, become an important technology of national economy and social development.Currently, in some extreme rings
Under border, such as high temperature and pressure, strong-electromagnetic field, the conditions such as ultralow temperature, there is an urgent need to high sensitivity, the sensor of strong antijamming capability comes
Realize the real-time monitoring to sensing target.
The development of optical sensor meets the demand of this respect.Optical sensor can electromagnetism interference, sensitivity compared with
Height, device structure design is versatile and flexible, and application range is wider.Optical sensor is in changes in environmental conditions such as temperature, pressure, magnetic fields
Under, light wave parameter, such as the variation of intensity, phase can be caused, realize sensing by detecting the variation of corresponding light wave parameter.Cause
This in recent decades, optical sensor has been increasingly becoming the primary study in the fields such as optics, medicine, biology, chemistry, materialogy
Object.Wherein, optical waveguide sensor is since with integrated level height, the advantages that electromagnetism interference is small in size, high sensitivity, be raw
An important realization platform for changing sensing receives extensive concern and research both at home and abroad.Utilize the light of polymeric material
Waveguide sensor is at low cost, and manufacture craft is simple, small with the coupling loss of optical fiber, is suitble to extensive manufacture.
For explosive gas detection in public safety, the fields such as industrial production have important application value, realize to explosion
For public place such as railway station, the safety check on airport has important for the quick response of object gas and highly sensitive detection
Practical significance.Therefore, the research of explosive gas sensor has important value for public safety.
But sensitive polymer material used in existing polymer waveguide explosive gas sensor due to hole compared with
The small response time is longer, is unfavorable for practical application.
Summary of the invention
In order to solve the above technical problems, the present invention proposes that a kind of polymer waveguide explosive gas based on polycarbonate passes
Sensor, sensitive covering of the porous polycarbonate of side chain chromophore containing dipole as explosives sensor, realizes its gas detection
Quick response.
The technical solution adopted by the present invention are as follows: a kind of polymer waveguide explosive gas sensor based on polycarbonate,
Using unpolarized electro-optic polymer material as the sensitive covering of explosive gas sensor, the unpolarized electro-optic polymer
Material is the porous polycarbonate of side chain chromophore containing dipole.
Further, the structure of the polycarbonate of side chain chromophore containing dipole are as follows:
Wherein, y:(x+z)=1:1.
Further, the explosive gas sensor are as follows: successively include input straight wave guide, 1 × 2 optical power distributor, two
Once moral arm, 2 × 1 wave multiplexers and output waveguide are formed by connecting asymmetrical Mach.
Further, described two asymmetrical Mach once moral arm, wherein the first arm is the straight wave guide of one fixed width,
Second arm is formed by connecting by input tapered transmission line, width less than the narrow straight wave guide of the first arm, output tapered transmission line.
Further, two arm lengths of described two asymmetrical Mach once moral arm are not identical.
Further, 1 × 2 optical power distributor is bimodulus Y-branch, and 2 × 1 wave multiplexers are single mode Y-branch.
Further, 1 × 2 optical power distributor is single mode Y-branch, and 2 × 1 wave multiplexers are single mode Y-branch.
Beneficial effects of the present invention: the present invention according to asymmetric mach, once wrap in sensitivity by moral arm, effective refractive index difference
When layer refractive index changes, the effective refractive index of two-arm changes difference, so that the phase difference of two-arm changes, according to output
The drift for interfering spectrum wavelength, detects explosion gas；It has the advantage that
1, the present invention uses unpolarized electro-optic polymer material, which is a kind of side chain containing dipole hair
The polycarbonate porous material of color group, the dipole chromophore in hole can rapidly adsorb the nitro explosive gas of electron deficient
Body makes the refractive index of film change, and realizes highly sensitive detection of gas；
2, sensor of the invention can realize the Sensitive Detection to 2,4-DNT, this kind of explosion gas of nitrobenzene；
3, sensor structure provided by the invention is simple, is easily integrated；
4, asymmetric mach provided by the invention once moral arm, wherein the first arm is the straight wave guide of one fixed width, Article 2
Arm is formed by connecting by input tapered transmission line, width less than the narrow straight wave guide of the first arm, output tapered transmission line；Narrow waveguide is in sensitivity
When cladding index changes, effective refractive index is changed greatly, and may make the phase difference of the two-arm variable big, is easy to detect.
Detailed description of the invention
Fig. 1 is that the polymer optical wave guide explosive gas of Mach-Zehnder interferometers structure provided in an embodiment of the present invention passes
The three-dimensional structure and device sectional drawing of sensor；
Wherein, 1 is input straight wave guide, and 2 be 1 × 2 optical power distributor, and 31 and 32 be respectively two asymmetrical Mach once moral arm
4 be 2 × 1 wave multiplexers, and 5 be output waveguide, and 6 be input tapered transmission line, and 7 be output tapered transmission line；
Fig. 2 is the mould field hot spot point of two asymmetric mach once moral arm of structure shown in Fig. 1 provided in an embodiment of the present invention
Butut；
Wherein, Fig. 2 (a) is the corresponding mould field hot spot distribution of wide straight wave guide, and Fig. 2 (b) is the narrow corresponding mould of straight wave guide
Field hot spot distribution；
Fig. 3 be it is provided in an embodiment of the present invention at room temperature, the Mach-Zehnder interferometers wave as prepared by EOPC1
Lead the testing result of p-nitrophenyl volatilization gas；
Fig. 4 be it is provided in an embodiment of the present invention at room temperature, MZ waveguide 2 prepared by EOPC1,4- dinitrotoluene (DNT)
The testing result of volatilization gas.
Specific embodiment
For convenient for those skilled in the art understand that technology contents of the invention, with reference to the accompanying drawing to the content of present invention into one
Step is illustrated.
Reported explosive gas detector majority be all based on electricity sensing, under strong electrical field or magnetic field condition vulnerable to
Interference, leads to measurement error, and the explosive gas detector based on Fibre Optical Sensor is difficult to integrate, and flexible structure degree is poor.For
Problem above, the invention proposes a kind of novel light waves of Mach-Zehnder interferometers structure to lead explosive gas detector, institute
The optical waveguide detector of design is using refractive index sensing as principle, fast response time, electromagnetism interference, and device architecture is simply easy to collect
At realization hand-held detection.And sensitive polymer material used in existing polymer waveguide explosive gas sensor due to
Hole is smaller, and the response time is longer, is unfavorable for practical application.In response to this problem, the invention proposes side chain chromophories containing dipole
Sensitive covering of the porous polycarbonate as explosives sensor, realizes the quick response of its gas detection.
The quick adsorption of explosive gas is acted in conjunction with the asymmetrical structure of two-arm and electro-optic polymer material, construction
A kind of novel light wave derivative sensor, the sensor using a kind of unpolarized electro-optic polymer material as sensitive covering,
The electro-optic polymer material is a kind of polycarbonate porous material of side chain chromophore containing dipole, and the dipole chromophore in hole can
Rapidly to adsorb the nitro explosive gas of electron deficient, the refractive index of film is made to change.
The porous polycarbonate structure of side chain chromophore containing dipole are as follows:
Wherein, y:(x+z)=1:1.
The present embodiment is illustrated by taking two asymmetrical Mach as shown in Figure 1 once sensor of moral arm as an example:
The sensor structure is successively including inputting straight wave guide 1,1 × 2 optical power distributor, 2, two asymmetrical Mach once
Moral arm (31 and 32), 2 × 1 wave multiplexers 4 and output waveguide 5 are formed by connecting；In the present embodiment: two asymmetrical Mach were once
Wherein the first arm is the straight wave guide 31 of one fixed width to moral arm, and the second arm is by input tapered transmission line 6, width less than the first arm
Narrow straight wave guide 32, output tapered transmission line 7 be formed by connecting, 1 × 2 optical power distributor 2 be bimodulus Y-branch, 2 × 1 wave multiplexers 4 be single mode
Y-branch.
Realization principle are as follows: the work light of sensor be C+L waveband width light source, light by single mode optical fiber from input straight wave guide
Input, is assigned to two-arm waveguide of different size by bimodulus Y-branch and is transmitted, of different size due to two-arm causes it to have
It is different to imitate refractive index.When the electro-optic polymer refractive index of top covering changes because of the concentration variation of explosive gas, two-arm
Effective refractive index change different, the mould field hot spot distribution map of two asymmetric mach once moral arm is illustrated in figure 2, wherein narrow wave
The effective refractive index led changes greatly, so that the phase difference of two-arm changes, leads to the drift of output interference spectrum wavelength.It is different
Explosive gaseous species and concentration correspond to different interference central wavelength, are achieved in the inspection to explosive gaseous species and concentration
It surveys.
The dipole chromophore of the present embodiment is illustrated by taking EOPC1 as an example, and EOPC1 structure is as follows:
According to the device architecture of design, goes out mach zhender waveguide sensor with polymeric material, detect nitre respectively
Base benzeneVolatilization gas and 2,4-DNT volatilization gasThe testing result of nitrobenzene such as Fig. 3
Shown, the testing result of 2,4- dinitrotoluene (DNT)s is as shown in Figure 4.
As shown in Figure 3 and Figure 4, at room temperature, as the time increases, the concentration of two kinds of gas increases, interference spectrum
Wavelength drifts about to correspondingly long wave length direction, and when electro-optic polymer reaches saturation for the absorption of gas, wavelength is no longer moved.
As shown in Figure 3 and Figure 4, since the chemical property of two kinds of gas molecules is different, the response time of device, wavelength shift reaches
The time of saturated absorption is all different, embodies device and senses to the selectivity of explosive gas.In the wavelength of existing spectrometer
On resolution base, sensor prepared by the present invention can rapidly detect 2,4- dinitrotoluene (DNT) in 30 seconds, to nitre
The response time of base benzene was less than 10 seconds.The electro-optic polymer of host-guest system used in existing gas sensor is to DNT gas
The response time of body at 30 minutes or more, lacks the feasibility of practical application.Explosive gas sensor of the invention can be real
Existing DNT concentration, which is less than 1ppb, to be detected in 30 seconds, and nitro phenenyl concentration, which is less than 100ppb, to be detected in 10s；It can be seen that
The detection efficiency of the explosive gas sensor of invention is much higher than existing sensor.
To sum up, the present invention realizes the quick detection to two kinds of explosive gas by Mach-Zehnder interferometers structure,
A kind of explosive gas optical waveguide sensor is produced, speed of detection is fast, high sensitivity, has good practical application value.
Those skilled in the art can also make several equivalent variations and replace, it should be understood that in present disclosure
It changes, for example side chain contains similar chromophore architectures: the electric light makrolon material of EOPC2, EOPC3, EOPC4,1 × 2 optical power distributor
For single mode Y-branch, the asymmetrical Mach-Zehnder interferometers structure of length realizes that these equivalent replacements should be included in
Within scope of the presently claimed invention.
EOPC2 structure are as follows:
EOPC3 structure is
EOPC4 structure are as follows:
Claims (7)
1. a kind of polymer waveguide explosive gas sensor based on polycarbonate, which is characterized in that with unpolarized electric light
Sensitive covering of the polymer material as explosive gas sensor, the unpolarized electro-optic polymer material are side chain containing even
The porous polycarbonate of pole chromophore.
2. a kind of polymer waveguide explosive gas sensor based on polycarbonate according to claim 1, feature
It is, the structure of the polycarbonate of side chain chromophore containing dipole are as follows:
Wherein, y:(x+z)=1:1.
3. a kind of polymer waveguide explosive gas sensor based on polycarbonate according to claim 2, feature
It is, the explosive gas sensor are as follows: successively include input straight wave guide, 1 × 2 optical power distributor, two asymmetrical Mach
Once moral arm, 2 × 1 wave multiplexers and output waveguide were formed by connecting.
4. a kind of polymer waveguide explosive gas sensor based on polycarbonate according to claim 3, feature
It is, described two asymmetrical Mach once moral arm, wherein the first arm is the straight wave guide of one fixed width, the second arm is by inputting
Tapered transmission line, width are formed by connecting less than the narrow straight wave guide of the first arm, output tapered transmission line.
5. a kind of polymer waveguide explosive gas sensor based on polycarbonate according to claim 3, feature
It is, two arm lengths of described two asymmetrical Mach once moral arm are not identical.
6. a kind of polymer waveguide explosive gas sensor based on polycarbonate according to claim 4 or 5, special
Sign is that 1 × 2 optical power distributor is bimodulus Y-branch, and 2 × 1 wave multiplexers are single mode Y-branch.
7. a kind of polymer waveguide explosive gas sensor based on polycarbonate according to claim 4 or 5, special
Sign is that 1 × 2 optical power distributor is single mode Y-branch, and 2 × 1 wave multiplexers are single mode Y-branch.
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| CN201910460222.4A CN110174373A (en) | 2019-05-30 | 2019-05-30 | A kind of polymer waveguide explosive gas sensor based on polycarbonate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111982859A (en) * | 2020-08-31 | 2020-11-24 | 山东大学 | Refractive index sensor based on Mach-Zehnder structure and detection method thereof |
| CN112730330A (en) * | 2021-01-19 | 2021-04-30 | 中南大学 | Carbon point waveguide-based benzoyl peroxide gas sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111982859A (en) * | 2020-08-31 | 2020-11-24 | 山东大学 | Refractive index sensor based on Mach-Zehnder structure and detection method thereof |
| CN111982859B (en) * | 2020-08-31 | 2021-12-24 | 山东大学 | Refractive index sensor based on Mach-Zehnder structure and detection method thereof |
| CN112730330A (en) * | 2021-01-19 | 2021-04-30 | 中南大学 | Carbon point waveguide-based benzoyl peroxide gas sensor |
| CN112730330B (en) * | 2021-01-19 | 2022-11-01 | 中南大学 | Carbon point waveguide-based benzoyl peroxide gas sensor |
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