CN107132201A - 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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- CN107132201A CN107132201A CN201710564133.5A CN201710564133A CN107132201A CN 107132201 A CN107132201 A CN 107132201A CN 201710564133 A CN201710564133 A CN 201710564133A CN 107132201 A CN107132201 A CN 107132201A
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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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
-
- 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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
Abstract
The invention 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 mouthful 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 linked 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 mouthful connection 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
The present invention relates to fiber optic sensor technology field, more particularly to a kind of laser type of pH value for monitoring solution are remote
Journey pH value monitoring device.
Background technology
The pH value of liquid be reflect its acid-base value important parameter, be also modern industry process control technology, biotechnology,
Important parameter index in the technical field such as medical treatment and environmental monitoring.Therefore, have to the accurate measurement of pH value and monitoring important
Realistic meaning.
Traditional pH value measuring method has PH test paper Comparison Method, PH glass electrode methods, indicator analysis etc., these methods
There is the deficiency of response time length, stability difference and the not high aspect of measurement accuracy.Fibre optical sensor because sensitivity is high, 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.Accordingly, it would be desirable to develop that 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.
The content of the invention
The technical problems to be solved by the invention are：There is provided a kind of laser type long-range pH value monitoring device, the monitoring device
Solve the complicated of pH value monitoring device and the remote technical problem monitored in real time can not be realized.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of long-range pH value monitoring dress of laser type
Put, including 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 mouthful and D ports, the output end of the narrow linewidth laser connect the A ports of three-dB coupler, the biography
Sense head includes the D-shaped optical fiber and polarization maintaining optical fibre linked together, and the B ports connect the sensing head by the delivery optical fiber
D-shaped optical fiber, the D ports pass through the delivery optical fiber and connect the polarization maintaining optical fibre, and the three-dB coupler connects the sensing
Head constitutes sagnac interferometer, the C-terminal mouthful connection light power meter.
As an improvement mode, in addition to carrier fluid groove, the sensing head is 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
Development technology is ground provided with depression.
As an improvement mode, the middle part of the depression is plane, and the two 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 9~11.5um, the multimode fibre length is 10~20cm, and the core diameter of the multimode fibre is 50um or 62.5um.
As an improvement mode, the output wavelength of the narrow linewidth laser is the interference spectrum some trough rising
The wavelength of half at along position.
Use the 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, which is reentered, can form interference spectrum, narrow linewidth laser after coupler
The optical maser wavelength sent when interference spectrum is moved, 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 is directly contacted 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 simple in construction, cost low, can monitor in real time
Advantage.
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, carries out Side polishing fiber, because the core diameter of multimode fibre is larger, the depth in rubbing down area can basis using multimode fibre
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 is directly contacted 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 two ends of depression are that laser in curved surface, multimode fibre fibre core can be
Extraneous medium is entered at curved surface, so that in extraneous Propagation, and the laser in extraneous medium at the curved surface of the other end
Fibre core can be coupled into again.
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 making 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 is connected together with polarization maintaining optical fibre by way of to core welding, 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 for the laser type pH value monitoring device invented；
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 present invention is further described 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 light
Fibre 52 is welded together composition sensing head.Three-dB coupler 3 includes A ports, B ports, C-terminal mouthful and D ports.Narrow-linewidth laser
The output end of device 1 connects the A ports of three-dB coupler 3, and the B ports of three-dB coupler connect the D-shaped of sensing head by delivery optical fiber 4
Optical fiber 51, D ports connect polarization maintaining optical fibre 52, C-terminal mouthful 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 actual needs, and
Adjusting range is larger, and the middle part of depression is plane, and the two ends of depression are that the laser in curved surface, multimode fibre fibre core can be in curved surface
Place enters extraneous medium, so that in extraneous Propagation, and the laser energy in extraneous medium at the curved surface of the other end
It is coupled 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 depression
The covering in area, because optical fiber has evanscent field characteristic, fibre core is directly contacted with extraneous medium, and evanscent field characteristic is stronger, is leaked to
Laser in extraneous medium can increase.Multimode fibre can be swashed with the light of simultaneous transmission various modes in Fibre Optical Sensor using it
The characteristic of various modes is sent out, non-interfering simultaneous transmission is realized.Polarization maintaining optical fibre 52 can keep the polarization state of light not when passing light
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 that described anti-vibration single mode narrow linewidth laser 1 is exported just is 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 that laser can be passed
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 9~11.5um, and cladding diameter is 125um.D-shaped optical fiber 51
It is made of multimode fibre Side polishing fiber, multimode fibre length is 10~20cm, core diameter is 50um or 62.5um, and covering is straight
Footpath is 125um, 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 making 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
Incide after D-shaped optical fiber 51, the light of various modes is inspired first, 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, there is energy loss, so the power of light is just changed.Light is passed to
During polarization maintaining optical fibre 52, polarization maintaining optical fibre 52 can keep the polarization state of light well, and meet the light of the pattern of certain condition and can send out
Raw interference so that energy is redistributed, and generation interference peaks characteristic wavelength corresponding with interference paddy, light weight on transmission spectrum
Interference spectrum is formed after newly entering coupler.
The optical maser wavelength that the long-range pH value monitoring device of this laser type is sent by described narrow linewidth laser 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, and such interference spectrum can be moved, that is, the wavelength of investigated trough can be moved, wavelength
Movement can cause the luminous power of detection to change, therefore be assured that by the measurement of optical power change the change of trough wavelength
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 for needing to measure is added
Inject in carrier fluid groove 6 to sensing head is totally submerged, 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
The change of luminous power in the detection carrier fluid of power meter 7 groove 6 during splendid attire different liquids 8, 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 present invention of described above, all should belong to
It is the detailed description for being directed to the present invention preferably possible embodiments that the present invention, which is contained, but embodiment is not limited to the special of the present invention
Sharp application range, lid the scope of the claims.
Claims (8)
1. a kind of long-range pH value monitoring device of laser type, it is characterised in that
Including 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 mouthful 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 described pass 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, and the three-dB coupler connection is described
Sensing head constitutes sagnac interferometer, the C-terminal mouthful connection 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 is provided with depression by Side polishing fiber development technology.
4. the long-range pH value monitoring device of laser type as claimed in claim 1, it is characterised in that the middle part of the depression is flat
Face, the two 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 is protected with described
Polarisation fibre is connected together by way of to core welding.
7. the long-range pH value monitoring device of laser type as claimed in claim 1, 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 is 9~11.5um, and the multimode fibre length is 10~20cm, the multimode
The core diameter of optical fiber is 50um or 62.5um.
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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| CN201710564133.5A CN107132201A (en) | 2017-07-12 | 2017-07-12 | The long-range pH value monitoring device of laser type |
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| CN201710564133.5A CN107132201A (en) | 2017-07-12 | 2017-07-12 | The long-range pH value monitoring device of laser type |
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Cited By (3)
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| CN109738373A (en) * | 2019-01-22 | 2019-05-10 | 北京信息科技大学 | PH sensor and preparation method thereof based on photonic crystal fiber |
| CN109883586A (en) * | 2019-02-26 | 2019-06-14 | 山东大学 | A kind of lithium niobate crystal pressure sensor and its application based on polarization interference |
| CN111426337A (en) * | 2020-03-30 | 2020-07-17 | 重庆邮电大学 | Sagnac interference fluid sensing system based on side-throwing optical fiber |
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| CN109738373A (en) * | 2019-01-22 | 2019-05-10 | 北京信息科技大学 | PH sensor and preparation method thereof based on photonic crystal fiber |
| CN109883586A (en) * | 2019-02-26 | 2019-06-14 | 山东大学 | A kind of lithium niobate crystal pressure sensor and its application based on polarization interference |
| CN109883586B (en) * | 2019-02-26 | 2021-05-11 | 山东大学 | Lithium niobate crystal pressure sensor based on polarization interference and application thereof |
| CN111426337A (en) * | 2020-03-30 | 2020-07-17 | 重庆邮电大学 | Sagnac interference fluid sensing system based on side-throwing optical fiber |
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