CN108871697A - A kind of gas leakage detection device of all optical fibre structure - Google Patents
A kind of gas leakage detection device of all optical fibre structure Download PDFInfo
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- CN108871697A CN108871697A CN201810426205.4A CN201810426205A CN108871697A CN 108871697 A CN108871697 A CN 108871697A CN 201810426205 A CN201810426205 A CN 201810426205A CN 108871697 A CN108871697 A CN 108871697A
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- vibrating diaphragm
- gas leakage
- sound wave
- size vibrating
- small size
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
Abstract
A kind of gas leakage detection device of all optical fibre structure provided by the present invention is sensed for leaking caused sound wave to gas, and transmitting receiving portion, coupling unit, guiding optical cable and gas including optical signal leak sound wave collection part.The present invention drives guiding optical cable using vibrating diaphragm, changes the light path of probe source, realizes that the external modulation of gas leakage signal, modulated optical signal are transmitted to detector via guiding optical cable and demodulate, realizes the real-time monitoring to gas leakage situation.A kind of sound wave collection device is devised, the center amplitude of vibrating diaphragm can be increased, substantially increase the detectivity of device.
Description
Technical field
The present invention relates to the gas leak detection apparatus of a kind of full-fiber sensor, especially all optical fibre structure.
Background technique
Common sensor is active device currently on the market, is easy to produce electric spark, sensors with auxiliary electrode is for monitoring oil
Feed channel or the leakage situation of gas tank are danger closes, and common sensor does not have good anti-electromagnetic interference capability and resists
Corrosive power, applicable place receive limitation.
Full-fiber sensor has electromagnetism interference, anticorrosive, waterproof characteristic, and application place is more extensive；All -fiber
The gas leakage detection device of structure is passive device, and energy security application is in combustible and explosive area, when oil-gas pipeline or gas tank are sent out
When raw leakage, the sound wave of generation will cause the vibration of vibrating diaphragm, change the light path of probe source, to make the light of probe source
Intensity values size changes.
Intensity of acoustic wave caused by gas leakage is often very faint, is only capable of making vibrating diaphragm that small vibration occur
It is dynamic, so that detectivity is not high.The present invention devises a kind of sound wave collection device, constructs one kind in sound wave collection device
Enlarged cavity substantially increases the detectivity of the gas leak detection apparatus of all optical fibre structure.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of gas leakage inspection of achievable high sensitivity
Survey technology.
The gas leakage detection system of a kind of all optical fibre structure provided by the present invention, for leaking caused sound to gas
Wave is sensed, and the gas leakage detection system of all optical fibre structure includes：
Light source, three port circulators, guiding optical cable, vibrating diaphragm, sound wave collection device, highly reflecting films, photodetector, acquisition
Card；Wherein：The output end of the light source is connected with the input terminal of three port circulators, one end of the guiding optical cable and three ports
The transmitting-receiving multiplexing end of circulator is connected, and the other end of the guiding optical cable is fiber end face, and the guiding optical cable passes through small size vibration
Together with small size vibrating diaphragm gluing, the fibre-optical probe is suspended in sound wave collection device for the part of dynamic diaphragm, the height
Reflectance coating is plated in plane parallel with fiber end face in sound wave collection device, the output end and photoelectricity of three port circulator
The input terminal of detector is connected, and the output end of the photodetector is connected with the input terminal of capture card.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described；
Fig. 1 is a kind of index path of the gas leakage detection system of all optical fibre structure of the present invention.
Appended drawing reference：1, light source；2, three port circulator；3, guiding optical cable；Fiber end face 4,；5, small size vibrating diaphragm；
6, sound wave collection device；7, highly reflecting films；8, photodetector；9, capture card；10, large size vibrating diaphragm.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation retouches art, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Figure 1, a kind of gas leakage detection system of all optical fibre structure, structure include：Light source 1, three port rings
Shape device 2, guiding optical cable 3, fiber end face 4, small size vibrating diaphragm 5, sound wave collection device 6, highly reflecting films 7, photodetector 8,
Capture card 9, large size vibrating diaphragm 10；The output end of the light source is connected with the input terminal of three port circulators, the guidance light
Fine one end is connected with the transmitting-receiving of three port circulators multiplexing end, and the other end of the guiding optical cable is fiber end face, described to draw
Guiding fiber passes through the part of small size vibrating diaphragm together with small size vibrating diaphragm gluing, and the guiding optical cable parts hang is in sound
In wave collection device, the highly reflecting films are plated in plane parallel with fiber end face in sound wave collection device, three port
The output end of circulator is connected with the input terminal of photodetector, the output end of the photodetector and the input terminal of capture card
It is connected.
The light source 1 is single wavelength light source, and the optical fiber used is graded index multimode fiber.
The trumpet vibrating diaphragm 5 and large size vibrating diaphragm 10 are PET film, and with a thickness of 0.01mm, diameter is respectively
2mm, 4mm；Vibrating diaphragm preparation process is as follows：
（1）With phthalic acid (PTA) and ethylene glycol（EG）For raw material, with ionic liquid tetrafluoro boron l- methyl -3- butyl imidazole
([BMIm] BF4/AlCl3) is catalyst, carries out esterification, is generated to generation ethylene terephthalate (BHET)；
（2）Polyethylene terephthalate (BHET is extracted using liquid separation method）；
（3）BHET occurs polycondensation reaction under catalyst Ecocat effect and generates PET；
（4）The PET film with a thickness of 0.01mm is generated using membrane technology.
The concrete operations mode that the guiding optical cable 3 is embedded in small size vibrating diaphragm 5 is as follows：
（1）The experiment optical fiber for taking one with 3 same specification of guiding optical cable, under the conditions of 30 DEG C of room temperature, the concentrated sulfuric acid for being 96% by concentration
It is applied to the fiber end face of experiment optical fiber, the fiber end face with the concentrated sulfuric acid is then made vertically to fit in small size vibrating diaphragm 5, weight
Multiple aforesaid operations are multiple, until the small sircle hole slightly larger than experiment fibre diameter occurs in small size 5 center of vibrating diaphragm.Finally use wine
Essence wipes small size vibrating diaphragm 5, removes pollutant；
（2）It is uniformly applied to the cladding surface away from 5 end face 2mm of guiding optical cable using micro silicon rubber, guiding optical cable 3 is inserted into
The central small hole of small size vibrating diaphragm 5, and make 3 end face of guiding optical cable away from central small hole 2mm, silicon rubber is air-dried, so that guidance
Optical fiber 3 is fixed on small size vibrating diaphragm 5.
The highly reflecting films 7 are total station reflector plate, with a thickness of 0.8mm.
The sound wave collection device 6 is to be completely closed device, and acoustic wave inlet is flaring pyriform, and sound wave is relatively narrow by one
Channel transfer to trumpet vibration diaphragm causes diaphragm vibration.The wall of the sound wave collection device 6 is that lightweight is anticorrosive with material
Titanium alloy, with a thickness of 1mm, it is 4mm, outer diameter 5mm that pears type, which is flared internal diameter,；The internal diameter of cylindrical sleeve is 2mm, and outer diameter is
3mm.Distance of 6 end face of guiding optical cable apart from highly reflecting films is 0.4mm；A height of 4.2mm of cylindrical sleeve.Large size vibrating diaphragm
10 are close to flaring pears type end side, and small size vibrating diaphragm 5 is close to the upper port of cylindrical sleeve, constitute closed sound wave amplification dress
It sets；Large size vibrating diaphragm 10 is used to collect the acoustic wave energy that gas leakage generates, and acoustic wave energy is bound in device 6 and transmits
To small size vibrating diaphragm 5, small size vibrating diaphragm 5 is caused to generate vibration, drives guiding optical cable 3 immediately, change fiber end face 4 with
Vertical range between highly reflecting films 7.Ignore loss of the energy in sound wave collection device 6, due to small size vibrating diaphragm 5 and greatly
The area ratio of number vibrating diaphragm 10 is 1:4, then the center amplitude ratio of the two is 4:1, so that fiber end face 5 and highly reflecting films 7
The distance between variation it is sensitiveer.
The sample rate of the capture card 9 is 50ks/s.
A kind of working principle of the gas leakage detection system to all optical fibre structure is described in detail below：
It is injected in guiding optical cable 3 by the continuous light that the light source 1 is exported by three port circulators 2, continuous light passes through guidance
Optical fiber 3 enters fiber end face 4, and the emergent light of fiber end face 4 is transmitted to highly reflecting films 7, reflects light back into fiber end face 4 and drawn
Guiding fiber 3 receives, and reflected light enters photodetector 8 by the output end of three port circulators 2 and be converted to electric signal, then by
Capture card 9 acquires.When gas leakage occurs for the external world, the acoustic signals generated by gas leakage are by the big of sound wave collection device 6
Number vibrating diaphragm 10 is collected, and acoustic signals then pass through one section of relatively narrow pipeline and are transmitted to small size vibrating diaphragm 5, small size vibrating membrane
Piece 5 deformation occurs under the action of sound wave and drive gluing guiding optical cable 3 be subjected to displacement, the intensity of reflected light is with guidance light
The displacement of fibre 3 changes, i.e., intensity of reflected light is modulated by acoustic signals,
Intensity modulation functional relation is：
The light intensity that I (z) is detected by reception optical fiber terminal in formula；Z is graded index multimode fiber end face 4 and highly reflecting films
Vertical range between 7；I0To enter the light intensity in launching fiber by light source couples, R is the reflectivity of highly reflecting films 7, and value is
0.95；σ is the relevant parameter of a characterization Refractive Index Profile o；a0To close fiber core radius, Graded-index multimode is closed fine
4, a0=25um；ζ be to light source type and light source with fiber coupling situation relevant modulation parameter；θcFor gradual change shape fiber optic collimator
The maximum outgoing of device 4, θc=16°。
The vibration information of sound wave, including intensity can be obtained by handling the collected intensity of reflected light signal of capture card 9
Information and frequency information.
Claims (8)
1. a kind of gas leakage detection device of all optical fibre structure, it is characterised in that including：
Light source 1, three port circulators 2, guiding optical cable 3, fiber end face 4, small size vibrating diaphragm 5, sound wave collection device 6, height are anti-
Penetrate film 7, photodetector 8, capture card 9, large size vibrating diaphragm 10；Wherein：The output end of the light source 1 and three port circulators
2 input terminal is connected, and one end of the guiding optical cable 3 is connected with the transmitting-receiving of three port circulators 2 multiplexing end, the guiding optical cable
3 other end is connected with fiber end face 4, part and small size vibrating diaphragm 5 of the guiding optical cable 3 across small size vibrating diaphragm 5
Together, the paces of the guiding optical cable 3 are suspended in sound wave collection device 6 gluing, and the highly reflecting films 7 are plated in sound wave collection
In device 6 in the plane parallel with fiber end face 4, the output end of three port circulator 2 and the input terminal of photodetector 8
It is connected, the output end of the photodetector 8 is connected with the input terminal of capture card 9.
2. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：The light source
1 is single wavelength light source, and the optical fiber used is graded index multimode fiber.
3. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：The trumpet
Vibrating diaphragm 5 and large size vibrating diaphragm 10 are PET film, and with a thickness of 0.01mm, diameter is respectively 2mm, 4mm.
4. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：Described draws
Guiding fiber 3 is embedded in the mode of small size vibrating diaphragm 5.
5. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：It is described high anti-
Penetrating film 5 is total station reflector plate, with a thickness of 0.8mm.
6. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：The sound wave
The acoustic wave inlet of collection device 6 is flaring pyriform, and sound wave causes film by a relatively narrow channel transfer to small size vibrating diaphragm
Piece vibration, the wall of the sound wave collection device 6 is the erosion-resisting titanium alloy of lightweight with material, with a thickness of 1mm, the flaring of pears type
Internal diameter is 4mm, outer diameter 5mm；The internal diameter of cylindrical sleeve is 2mm, and outer diameter 3mm, 5 end face of guiding optical cable is apart from highly reflecting films
Distance be 0.4mm；A height of 4.2mm of cylindrical sleeve.
7. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：The sound wave
Collection device 6 is to be completely closed device, and large size vibrating diaphragm 10 is close to flaring pears type end side, and small size vibrating diaphragm 5 is close to cylinder
The upper port of shape sleeve constitutes closed acoustic amplification device；Large size vibrating diaphragm 10 is used to collect the sound that gas leakage generates
Wave energy, acoustic wave energy are bound in device 6 and are transmitted at small size vibrating diaphragm 5, and small size vibrating diaphragm 5 is caused to generate vibration
It is dynamic, guiding optical cable 3 is driven immediately, changes the vertical range between fiber end face 4 and highly reflecting films 7；Ignore energy to receive in sound wave
Loss in acquisition means 6, since the area ratio of small size vibrating diaphragm 5 and large size vibrating diaphragm 10 is 1:4, then the center of the two
Amplitude ratio is 4:1, so that the variation of the distance between fiber end face 4 and highly reflecting films 7 is sensitiveer.
8. a kind of gas leakage detection device of all optical fibre structure according to claim 1, it is characterised in that：The acquisition
The sample rate of card 9 is 50ks/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810426205.4A CN108871697B (en) | 2018-05-07 | 2018-05-07 | Gas leakage detection device with all-fiber structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810426205.4A CN108871697B (en) | 2018-05-07 | 2018-05-07 | Gas leakage detection device with all-fiber structure |
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| CN108871697B CN108871697B (en) | 2020-09-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749399A (en) * | 2019-10-31 | 2020-02-04 | 西安西变组件有限公司 | Conservator capsule leakage detection device and transformer oil storage system |
| CN117007173A (en) * | 2023-10-07 | 2023-11-07 | 山东省科学院激光研究所 | Optical fiber acoustic wave sensor for monitoring pipeline leakage |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247490A (en) * | 1992-06-04 | 1993-09-21 | Martin Marietta Corporation | Pressure-compensated optical acoustic sensor |
| CN104165684A (en) * | 2014-07-15 | 2014-11-26 | 中国计量学院 | Surface plasmon resonance-based supersensitive hydrophone |
| CN105300507A (en) * | 2015-10-26 | 2016-02-03 | 南京航空航天大学 | Optical fiber vibration sensor and M-Z sensing arm optical path structure comprising same |
| CN106468722A (en) * | 2016-05-25 | 2017-03-01 | 哈尔滨工业大学 | Intrinsical Fabry-perot optical fiber acceleration transducer based on 45 ° of optical fiber and processing method |
-
2018
- 2018-05-07 CN CN201810426205.4A patent/CN108871697B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5247490A (en) * | 1992-06-04 | 1993-09-21 | Martin Marietta Corporation | Pressure-compensated optical acoustic sensor |
| CN104165684A (en) * | 2014-07-15 | 2014-11-26 | 中国计量学院 | Surface plasmon resonance-based supersensitive hydrophone |
| CN105300507A (en) * | 2015-10-26 | 2016-02-03 | 南京航空航天大学 | Optical fiber vibration sensor and M-Z sensing arm optical path structure comprising same |
| CN106468722A (en) * | 2016-05-25 | 2017-03-01 | 哈尔滨工业大学 | Intrinsical Fabry-perot optical fiber acceleration transducer based on 45 ° of optical fiber and processing method |
Non-Patent Citations (2)
| Title |
|---|
| 孙晶华 等: "《大学物理实验教程》", 30 June 2016, 哈尔滨工程大学出版社 * |
| 王振成 等: "《工程测试技术及应用》", 31 August 2014, 重庆大学出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749399A (en) * | 2019-10-31 | 2020-02-04 | 西安西变组件有限公司 | Conservator capsule leakage detection device and transformer oil storage system |
| CN110749399B (en) * | 2019-10-31 | 2021-09-21 | 西安西变组件有限公司 | Conservator capsule leakage detection device and transformer oil storage system |
| CN117007173A (en) * | 2023-10-07 | 2023-11-07 | 山东省科学院激光研究所 | Optical fiber acoustic wave sensor for monitoring pipeline leakage |
| CN117007173B (en) * | 2023-10-07 | 2024-01-30 | 山东省科学院激光研究所 | Optical fiber acoustic wave sensor for monitoring pipeline leakage |
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