CN207007712U - The long-range pH value monitoring device of laser type - Google Patents
The long-range pH value monitoring device of laser type Download PDFInfo
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- CN207007712U CN207007712U CN201720839000.XU CN201720839000U CN207007712U CN 207007712 U CN207007712 U CN 207007712U CN 201720839000 U CN201720839000 U CN 201720839000U CN 207007712 U CN207007712 U CN 207007712U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 24
- 239000013307 optical fiber Substances 0.000 claims abstract description 62
- 230000010287 polarization Effects 0.000 claims abstract description 25
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 210000004899 c-terminal region Anatomy 0.000 claims abstract description 8
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- 238000005516 engineering process Methods 0.000 claims description 7
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- 230000003287 optical effect Effects 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
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Abstract
The utility model discloses a kind of long-range pH value monitoring device of laser type, including narrow linewidth laser, three-dB coupler, delivery optical fiber, sensing head, carrier fluid groove and light power meter, the three-dB coupler includes A ports, B ports, C-terminal mouth and D ports, the output end of the narrow linewidth laser connects the A ports of the three-dB coupler, the sensing head includes the D-shaped optical fiber and polarization maintaining optical fibre to link together, the B ports connect the D-shaped optical fiber of the sensing head by the delivery optical fiber, the D ports connect the polarization maintaining optical fibre by the delivery optical fiber, the C-terminal mouth connects the light power meter.The monitoring device can solve the complicated of pH value monitoring device and can not realize the remote technical problem monitored in real time.
Description
Technical field
Fiber optic sensor technology field is the utility model is related to, more particularly to a kind of laser for being used to monitor the pH value of solution
The long-range pH value monitoring device of formula.
Background technology
The pH value of liquid be reflect its acid-base value important parameter, and modern industry process control technology, biotechnology,
Important parameter index in the technical field such as medical treatment and environmental monitoring.Therefore, the accurate measurement to pH value has important with monitoring
Realistic meaning.
Traditional pH value measuring method has pH test paper Comparison Method, pH glass electrode methods, indicator analysis etc., these methods
The deficiency of long response time, stability difference and the not high aspect of measurement accuracy be present.Fibre optical sensor due to high sensitivity, stably
Property good and strong interference immunity the features such as be used for progress pH measurement.Existing pH optical fibre measuring methods and pH fibre optical sensor knot
Structure is relative complex, causes instrument and equipment cost higher.Therefore, it is necessary to develop one simple in construction, the high and low cost of measurement accuracy,
The pH value measurement apparatus of on-line monitoring and remote monitoring can be realized.
Utility model content
Technical problem to be solved in the utility model is：There is provided a kind of laser type long-range pH value monitoring device, the monitoring
Device solves the complicated of pH value monitoring device and can not realize the remote technical problem monitored in real time.
In order to solve the above technical problems, technical scheme is used by the utility model：A kind of long-range pH value prison of laser type
Survey device, including narrow linewidth laser, three-dB coupler, delivery optical fiber, sensing head and light power meter, the three-dB coupler bag
Include A ports, B ports, C-terminal mouth and D ports, the A ports of the output end connection three-dB coupler of the narrow linewidth laser, institute
D-shaped optical fiber and polarization maintaining optical fibre that sensing head includes linking together are stated, the B ports connect the biography by the delivery optical fiber
Feel the D-shaped optical fiber of head, the D ports connect the polarization maintaining optical fibre by the delivery optical fiber, described in the three-dB coupler connection
Sensing head forms sagnac interferometer, and the C-terminal mouth connects the light power meter.
As an improvement mode, in addition to carrier fluid groove, the sensing head be arranged in the carrier fluid groove.
As an improvement mode, the D-shaped optical fiber is multimode fibre, and the side wall of the multimode fibre is thrown by side
Grind development technology and be provided with depression.
As an improvement mode, the middle part of the depression is plane, and the both ends of the depression are curved surface.
As an improvement mode, the length of the depression is 2cm, and the depth of the depression is the one of core diameter
Half.
As an improvement mode, the D-shaped optical fiber is connected to the polarization maintaining optical fibre by way of to core welding
Together.
As an improvement mode, the length of the polarization maintaining optical fibre is 8~18cm, the core diameter of the polarization maintaining optical fibre
For 9~11.5 μm, the multimode fibre length is 10~20cm, and the core diameter of the multimode fibre is 50 μm or 62.5 μm.
As an improvement mode, the output wavelength of the narrow linewidth laser is that the interference spectrum some trough rises
Along the wavelength of opening position half.
Use technique effect acquired by above-mentioned technical proposal for：
The laser that narrow linewidth laser is sent is divided into two-way after three-dB coupler, and two-way laser is respectively along two transmission light
Fibre is transmitted in the opposite direction, and when external environment (liquid pH value) change residing for sensing head, the heterogeneite of two-way light can be sent out
Raw corresponding change, causes two-way light to produce phase difference, light can form interference spectrum, narrow linewidth laser after reentering coupler
The optical maser wavelength sent when interference spectrum moves, can be led just at the wavelength of half at interference spectrum some trough leading edge position
The luminous power of detection is caused to change, analyzing changed power by light power meter can be monitored to pH value.This kind of laser type pH
Value monitoring device sensing head directly contacts with testing liquid so that the response of sensor is rapid, and sensitivity is higher, narrow-linewidth laser
Device, which exports more superpower laser, makes the distance of monitoring longer, and the monitoring device has that simple in construction, cost is low, can monitor in real time
The advantages of.
Due to also including carrier fluid groove, the sensing head is arranged in the carrier fluid groove, carrier fluid groove can be used to contain prepare liquid
Body carries out the monitoring of pH value.
Because the D-shaped optical fiber is multimode fibre, the side wall of the multimode fibre is provided with by Side polishing fiber development technology
Depression, Side polishing fiber is carried out using multimode fibre, because the core diameter of multimode fibre is larger, the depth in rubbing down area can basis
It is actually needed and is adjusted, and adjusting range is larger, and the fibre core of multimode fibre depressed area is directly in contact with extraneous medium, outside
Boundary's medium serves as the covering of multimode fibre depressed area, and because optical fiber has evanscent field characteristic, fibre core directly contacts with extraneous medium,
Evanscent field characteristic is stronger, and the laser being leaked in extraneous medium can increase.
Because the middle part of the depression is plane, the both ends of depression are curved surface, and the laser in multimode fibre fibre core can be in song
Extraneous medium is entered at face, so as in extraneous Propagation, and the laser in extraneous medium at the curved surface of the other end
Fibre core can be coupled into.
Because the length of depression is 2cm, the depth of depression is the half of core diameter, can improve what is propagated in fibre core
The optical path difference of laser and the laser in extraneous Propagation, while make be retained in the light intensity of the fibre core of depressed area with being leaked to
The light intensity of laser in extraneous medium improves signal to noise ratio more closely, make the light intensity of interference light bigger.
Because D-shaped optical fiber connects together by way of to core welding with polarization maintaining optical fibre, multimode fibre can be reduced as far as possible
With the light loss of polarization maintaining optical fibre junction.
Brief description of the drawings
Fig. 1 is the structural representation of the laser type pH value monitoring device of utility model；
Fig. 2 is D-shaped optical fiber structure schematic diagram；
Fig. 3 be Fig. 2 in F-F to sectional view；
In figure, 1- line widths laser, 3-3dB couplers, 4- delivery optical fibers, 51-D shapes optical fiber, 52- polarization maintaining optical fibres, 6- are carried
Liquid bath, 7- light power meters, 8- liquid, L- multimode fibre rubbing downs section length, h- are multimode fibre rubbing down depth.
Embodiment
The utility model is further illustrated with reference to the accompanying drawings and examples.
It is jointly shown with reference to Fig. 1 to Fig. 3, a kind of long-range pH value monitoring device of laser type, including narrow linewidth laser 1,3dB
Coupler 3, delivery optical fiber 4, D-shaped optical fiber 51, polarization maintaining optical fibre 52, carrier fluid groove 6 and light power meter 7.D-shaped optical fiber 51 and polarization-maintaining
Optical fiber 52 is welded together composition sensing head.Three-dB coupler 3 includes A ports, B ports, C-terminal mouth and D ports.Narrow linewidth swashs
The A ports of the output end connection three-dB coupler 3 of light device 1, the B ports of three-dB coupler connect the D of sensing head by delivery optical fiber 4
Shape optical fiber 51, D ports connect polarization maintaining optical fibre 52, C-terminal mouth connection light power meter 7 by delivery optical fiber 4.
D-shaped optical fiber 51 is developed using multimode Side polishing fiber, and the side wall of multimode fibre passes through Side polishing fiber development technology
Provided with depression, because the core diameter of multimode fibre is larger, the depth in rubbing down area can be adjusted according to being actually needed, and
Adjusting range is larger, and the middle part of depression is plane, and the both ends of depression are curved surface, and the laser in multimode fibre fibre core can be at curved surface
Extraneous medium is entered, so as in extraneous Propagation, and the laser and can coupling in extraneous medium at the curved surface of the other end
Close into fibre core.The fibre core of multimode fibre depressed area is directly in contact with extraneous medium, and extraneous medium serves as multimode fibre depressed area
Covering, because optical fiber has evanscent field characteristic, fibre core directly contacts with extraneous medium, and evanscent field characteristic is stronger, is leaked to outer
Laser in boundary's medium can increase.Multimode fibre can be excited with the light of simultaneous transmission various modes in Fibre Optical Sensor using it
The characteristic of various modes, realize non-interfering simultaneous transmission.Polarization maintaining optical fibre 52 can keep the polarization state of light not send out when passing light
It is raw to change, and loss is low, improves signal to noise ratio, it is possible to achieve high-precision measurement.
The output end of narrow linewidth laser 1 is connected with the A ports of three-dB coupler, and narrow linewidth laser 1 is anti-vibration single-frequency
Narrow linewidth laser 1, the optical maser wavelength of described anti-vibration single mode narrow linewidth laser 1 output are just equal to sensing head interference spectrum
Some trough leading edge position at half wavelength, interference spectrum move when, can cause detection luminous power change, make
Power analysis it is more convenient with it is direct.Described narrow linewidth laser 1 has higher power output, so as to which laser can pass
It is defeated and apart from longer, realize remote monitoring.
In the present embodiment, sensing head 5 includes one section of D-shaped optical fiber 51 and one section of polarization maintaining optical fibre 52, and connected mode is D-shaped optical fiber
51 use to core welding with polarization maintaining optical fibre 52, and welding pattern is MM-MM patterns, can reduce multimode fibre and polarization maintaining optical fibre 52 as far as possible
The light loss of junction.The smooth of welded joint and cleaning are should ensure that in welding optic fibre, strengthens the durability and reality of sensor-based system
The property used.The length of polarization maintaining optical fibre 52 is 8~18cm, and core diameter is 9~11.5 μm, and cladding diameter is 125 μm.D-shaped optical fiber 51
It is made of multimode fibre Side polishing fiber, multimode fibre length is 10~20cm, and core diameter is 50 μm or 62.5 μm, and covering is straight
Footpath is 125 μm, and multimode fibre rubbing down section length L is 2cm, is that multimode fibre rubbing down depth h is that fibre core grinds off half, can improve
The optical path difference of the laser propagated in fibre core and the laser in extraneous Propagation, while make be retained in the fibre core of depressed area
Light intensity with the light intensity of laser that is leaked in extraneous medium more closely, make the light intensity of interference light bigger, improve signal to noise ratio.
The D ports of three-dB coupler 3 are connected with the input of light power meter 7.Light power meter 7 is power of single channel meter 7,
The measurement range of power of single channel meter 7 is big, superior performance, economical and practical.
The operation principle of the long-range pH value monitoring device of the laser type is：
The laser that narrow linewidth laser 1 is sent is divided into two-way after three-dB coupler 3, and transmits in opposite direction, light
After inciding D-shaped optical fiber 51, the light of various modes is inspired first, and the light of partial mode can enter Jie in the external world in rubbing down area
In matter, because extraneous medium is different from the refractive index of multimode fibre fibre core, so leakage light can change in extraneous transmission speed
Become, when leakage light is coupled into multimode fibre again, energy loss be present, so the power of light is just changed.Light passes to
During polarization maintaining optical fibre 52, polarization maintaining optical fibre 52 can keep the polarization state of light well, and meet that the light of the pattern of certain condition can be sent out
Raw interference so that energy is redistributed, and characteristic wavelength corresponding to interference peaks and interference paddy, light weight are produced on transmission spectrum
Interference spectrum is formed after newly entering coupler.
The long-range pH value monitoring device of this laser type by the optical maser wavelength that described narrow linewidth laser is sent just at
Wavelength at interference spectrum trough leading edge position half, the light path of two-way interference light can be changed when environmental liquids pH value changes
Difference, that is, change the phase difference of two-way interference light, such interference spectrum can move, that is, the wavelength of investigated trough can move, wavelength
Movement can cause the luminous power of detection to change, therefore the change of trough wavelength is assured that by the measurement of optical power change
Change amount, it is possible thereby to pH value be calculated, so as to realize online remote monitoring.
The course of work of this laser type pH value monitoring device：
When measuring the pH value of liquid 7, as shown in Figure 1, sensing head is placed in carrier fluid groove 6, and the liquid 8 that needs are measured adds
To being totally submerged sensing head in injection carrier fluid groove 6, when the external environment residing for sensing head changes, the heterogeneite of two-way light
Change, cause two-way light to produce phase difference, the pH value of different liquids 8 will directly affect the optical signal of sensor output, light
Power meter 7 detects the change of luminous power when different liquids 8 are contained in carrier fluid groove 6, is become by the power for analyzing light power meter 7
Change, and then analyze the pH value of liquid 8, realize pH monitoring.
The equal change or modification change completed under technical spirit suggested by all the utility model of described above, all should
It is detailed description for the preferable possible embodiments of the utility model to belong to the utility model and contain, but embodiment and is not used to limit
Fixed patent claim of the present utility model, lid the scope of the claims.
Claims (8)
- A kind of 1. long-range pH value monitoring device of laser type, it is characterised in thatIncluding narrow linewidth laser, three-dB coupler, delivery optical fiber, sensing head and light power meter, the three-dB coupler includes A Port, B ports, C-terminal mouth and D ports, the output end of the narrow linewidth laser connect the A ports of the three-dB coupler, institute D-shaped optical fiber and polarization maintaining optical fibre that sensing head includes linking together are stated, the B ports connect the biography by the delivery optical fiber Feel the D-shaped optical fiber of head, the D ports connect the polarization maintaining optical fibre by the delivery optical fiber, described in the three-dB coupler connection Sensing head forms sagnac interferometer, and the C-terminal mouth connects the light power meter.
- 2. the long-range pH value monitoring device of laser type as claimed in claim 1, it is characterised in that also including carrier fluid groove, the biography Sense head is arranged in the carrier fluid groove.
- 3. the long-range pH value monitoring device of laser type as claimed in claim 1, it is characterised in that the D-shaped optical fiber is multimode light Fibre, the side wall of the multimode fibre are provided with depression by Side polishing fiber development technology.
- 4. the long-range pH value monitoring device of laser type as claimed in claim 3, it is characterised in that the middle part of the depression is flat Face, the both ends of the depression are curved surface.
- 5. the long-range pH value monitoring device of laser type as claimed in claim 4, it is characterised in that the length of the depression is 2cm, The depth of the depression is the half of core diameter.
- 6. the long-range pH value monitoring device of laser type as claimed in claim 1, it is characterised in that the D-shaped optical fiber and the guarantor Polarisation fibre connects together by way of to core welding.
- 7. the long-range pH value monitoring device of laser type as claimed in claim 3, it is characterised in that the length of the polarization maintaining optical fibre is 8~18cm, the core diameter of the polarization maintaining optical fibre are 9~11.5 μm, and the multimode fibre length is 10~20cm, the multimode The core diameter of optical fiber is 50 μm or 62.5 μm.
- 8. the long-range pH value monitoring device of laser type as claimed in claim 1, it is characterised in that the narrow linewidth laser it is defeated Go out the wavelength that wavelength is half at interference spectrum some trough leading edge position.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720839000.XU CN207007712U (en) | 2017-07-12 | 2017-07-12 | The long-range pH value monitoring device of laser type |
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| CN201720839000.XU CN207007712U (en) | 2017-07-12 | 2017-07-12 | The long-range pH value monitoring device of laser type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132201A (en) * | 2017-07-12 | 2017-09-05 | 广西师范大学 | The long-range pH value monitoring device of laser type |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132201A (en) * | 2017-07-12 | 2017-09-05 | 广西师范大学 | The long-range pH value monitoring device of laser type |
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Granted publication date: 20180213 |