CN107917784B - A kind of pipeline road Oil Leakage Detecting system and its working method based on fiber grating - Google Patents
A kind of pipeline road Oil Leakage Detecting system and its working method based on fiber grating Download PDFInfo
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Abstract
The present invention relates to aviation pipeline Oil Leakage Detecting technical fields, provide a kind of pipeline road Oil Leakage Detecting system and its working method based on fiber grating.The system includes the wavelength demodulation device and computer of detection sensor, multichannel, the detection sensor is made of base material, sensitive material, fiber grating, optical fiber is passed through from sensitive material and base material, and the different grating of two wavelength is set in sensitive material and the intermediate of base material respectively, grating in sensitive material is detection grating, grating in base material is reference grating, and reference grating and detection grating are symmetrically arranged in the joint of aircraft conduit.The present invention can overall monitor aircraft fuel oil, lubricating oil, hydraulic oil system pipeline oil leak situation, provide information accurately and timely for daily maintenance and airmiss processing, ensure flight safety.
Description
Technical field
The present invention relates to aviation pipeline Oil Leakage Detecting technical field, specifically a kind of petroleum pipeline based on fiber grating
Road Oil Leakage Detecting system and its working method.
Background technique
The leak detection of aircraft pipe-line system is the task of a difficulty and complexity during aircraft inspection.System on aircraft
Very much, it is necessary to assure the systematic leakproofness of institute on aircraft just can ensure that aircraft being capable of safe flight.Aviation pipeline system is main
It is made of hydraulic system, fuel system and oil system, working environment and the working condition difference of each system lack one at present
Kind detects oil leak method exclusively for aviation pipeline.
Summary of the invention
The purpose of the present invention is to overcome the above deficiencies in the prior art, provides a kind of based on fiber grating
Pipeline road Oil Leakage Detecting system and its working method, which being capable of overall monitor aircraft fuel oil, lubricating oil, hydraulic oil
The oil leak situation of system pipeline provides information accurately and timely for daily maintenance and airmiss processing, ensures flight safety.
The purpose of the present invention is what is be achieved by the following technical measures: a kind of pipeline road oil leak based on fiber grating
Detection system, including detection sensor, multi-channel wavelength (FBG) demodulator and computer, the detection sensor is by base material, quick
Feel material, fiber grating composition, the sensitive material is made of the ethylene propylene diene rubber of chance oil swell, and it is in long strip, with aircraft
The surface irregularity of catheter contact is equipped with multiple apertures in the colloid of sensitive material, and the base material is by ethylene-propylene-diene monomer
Glue is constituted, in long strip, and the surface of base material covers one layer of epoxy resin, and optical fiber is worn from sensitive material and base material
It crosses, and grating different with two wavelength of intermediate setting of base material in sensitive material respectively, the grating in sensitive material is
Grating is detected, the grating in base material is reference grating, and reference grating and detection grating are symmetrically arranged in connecing for aircraft conduit
At head, the detection sensor is connected with multi-channel wavelength (FBG) demodulator, and the multi-channel wavelength (FBG) demodulator is connected by pci bus
To computer.
In the above-mentioned technical solutions, detection sensor is fixed on the joint of aircraft conduit by clip, and clip is closed by aluminium
Golden material is made.
In the above-mentioned technical solutions, 5 detection sensors, detection sensing are arranged in each channel of multi-channel wavelength (FBG) demodulator
Device is cascaded by optical fiber, and the central wavelength of the detection grating in two neighboring detection sensor differs 15nm.
The present invention also provides a kind of working method of above-mentioned pipeline road Oil Leakage Detecting system based on fiber grating,
The following steps are included:
(1) detection sensor is arranged in each joint of aircraft fuel oil, lubricating oil, hydraulic oil system pipeline by clip,
Reference grating and detection grating, their initial center wavelength difference Δ λ have been arranged symmetrically in each detection sensor0For 5nm；
(2) it is demodulated using output wavelength of the multi-channel wavelength (FBG) demodulator to detection sensor, each Tandem 5
Detection sensor shares 16 channels, is demodulated by way of wavelength-division multiplex, and the detection sensor on each channel passes through optical fiber
It is cascaded, the central wavelength of the detection grating in two neighboring detection sensor differs 15nm；
It (3) the use of scan frequency is 500Hz, wave-length coverage is that the light source of 1510-1590nm gradually scans each channel, wave
Long (FBG) demodulator records the wavelength data of each grating, and computer is told each detection by the value of channel number and central wavelength and passed
Thus sensor monitors the pipeline state of whole airplane；
(4) when oil leak occurs for some position pipeline of aircraft, the sensitive material of the detection sensor at this starts to expand,
Internal stress structure changes, and detection grating is pulled, and central wavelength becomes larger, and base material will not expand, reference
The central wavelength of grating is constant, at this point, the value of detection grating and the central wavelength difference Δ λ of reference grating can become larger, setting is suitable
Threshold value e, when Δ λ be greater than e when, system thinks that oil leak has occurred herein, starts to alarm.
In the above-mentioned technical solutions, threshold value e is 8nm.
The present invention is based on the pipeline road Oil Leakage Detecting system and its working method of fiber grating, structure is simple, embodiment party
Just, can overall monitor aircraft fuel oil, lubricating oil, hydraulic oil system pipeline oil leak situation, be at daily maintenance and airmiss
Reason provides information accurately and timely, ensures flight safety.It also has the advantage that simultaneously
1. electrical insulation capability is good, safe and reliable: optical fiber is not necessarily to power drives, is suitable in inflammable and explosive aircraft fuel system
Middle use.
2. electromagnetism interference: the frequency of general electromagnetic radiation is more much lower than light wave, the optical signal transmitted in a fiber not by
The influence of electromagnetic interference is suitable for interior of aircraft complex environment.
3. compensation performance is good: the temperature and vibration very different of the working position of each system of interior of aircraft are for this
System is provided with symmetrical reference grating in each detection sensor, suitable for each position of aircraft, while can also keep away
Exempt from aircraft because high vibration generates wrong report.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of detection sensor.
Fig. 2 is the scheme of installation of detection sensor.
Fig. 3 is demodulating system schematic diagram.
Wherein: 1. sensitive materials, 2. base materials, 3. optical fiber, 4. clips, 5. detection gratings, 6. reference gratings.
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the present invention is clearly and completely described.
As shown in Figure 1, 2, the pipeline road Oil Leakage Detecting system based on fiber grating that the present embodiment provides a kind of, including inspection
Sensor, multi-channel wavelength (FBG) demodulator and computer are surveyed, the detection sensor is by base material, sensitive material, fiber grating
Composition, the sensitive material is made of the ethylene propylene diene rubber of chance oil swell, in long strip, the surface with aircraft catheter contact
It is uneven, it is equipped with multiple apertures in the colloid of sensitive material, increases the contact area with oil, accelerates the expansion of rubber, it is described
Base material is made of ethylene propylene diene rubber, in long strip, and the surface of base material covers one layer of epoxy resin, isolation and oil
Contact.Optical fiber is passed through from sensitive material and base material, and respectively in the intermediate setting two of sensitive material and base material
The different grating of wavelength, the grating in sensitive material are detection grating, and the grating in base material is reference grating, reference grating
The joint of aircraft conduit is symmetrically arranged in detection grating, the detection sensor is connected with multi-channel wavelength (FBG) demodulator, institute
It states multi-channel wavelength (FBG) demodulator and computer is connected to by pci bus.
In the above-described embodiments, detection sensor is fixed on the joint of aircraft conduit by clip, and clip is by aluminium alloy
Material is made.The size of clip is determined according to the pipe size of aircraft different parts.
In the above-described embodiments, 5 detection sensors, detection sensor are arranged in each channel of multi-channel wavelength (FBG) demodulator
It is cascaded by optical fiber, the central wavelength of the detection grating in two neighboring detection sensor differs 15nm, such as Fig. 3 institute
Show.
The present embodiment additionally provides a kind of work side of above-mentioned pipeline road Oil Leakage Detecting system based on fiber grating
Method, comprising the following steps:
(1) detection sensor is arranged in each joint of aircraft fuel oil, lubricating oil, hydraulic oil system pipeline by clip,
Because the vibration of aircraft different parts, temperature difference are very big, reference grating has been arranged symmetrically in each detection sensor
With detection grating, their initial center wavelength difference Δ λ0For 5nm；When the system is operating, because of reference grating and detection grating
It is arranged symmetrically, and is all embedded in ethylene propylene diene rubber, the central wavelength difference Δ λ of two gratings is always in the case where oil-proof
It is maintained at 5nm or so；
(2) each detection sensor is formed Distributed Detection by the method combined using wavelength-division multiplex and space division multiplexing
System is demodulated using output wavelength of the multi-channel wavelength (FBG) demodulator to detection sensor, and 5 detections of each Tandem pass
Sensor shares 16 channels, and the detection sensor on each channel is cascaded by optical fiber, two neighboring detection sensor
In detection grating central wavelength differ 15nm；
It (3) the use of scan frequency is 500Hz, wave-length coverage is that the light source of 1510-1590nm gradually scans each channel, wave
Long (FBG) demodulator records the wavelength data of each grating, and computer is told each detection by the value of channel number and central wavelength and passed
Thus sensor monitors the pipeline state of whole airplane；
(4) when oil leak occurs for some position pipeline of aircraft, the sensitive material of the detection sensor at this is met oil and is started
Expansion, sensitive material internal stress structure change, and detection grating is pulled, and central wavelength becomes larger, and base material will not
It expands, the central wavelength of reference grating is constant, at this point, the value meeting of detection grating and the central wavelength difference Δ λ of reference grating
Become larger, when Δ λ is greater than 8nm, system thinks that oil leak has occurred herein, starts to alarm.
The content being not described in detail in this specification belongs to the prior art well known to those skilled in the art.
The above is merely preferred embodiments of the present invention, it is not intended to limit the scope of the present invention.It is all in this hair
Within bright spirit and principle, any modification, equivalent substitution, improvement and etc. done should be included in protection scope of the present invention
Within.
Claims (5)
1. a kind of pipeline road Oil Leakage Detecting system based on fiber grating, it is characterized in that: including detection sensor, multichannel wave
Long (FBG) demodulator and computer, the detection sensor are made of base material, sensitive material, fiber grating, the sensitive material
It is made of the ethylene propylene diene rubber of chance oil swell, in long strip, the surface irregularity with aircraft catheter contact, sensitive material
Colloid in be equipped with multiple apertures, the base material is made of ethylene propylene diene rubber, and in long strip, the surface of base material is covered
One layer of epoxy resin of lid, optical fiber are passed through from sensitive material and base material, and respectively in sensitive material and base material
Between the different grating of two wavelength of setting, the grating in sensitive material is detection grating, and the grating in base material is reference light
Grid, reference grating and detection grating are symmetrically arranged in the joint of aircraft pipeline, the detection sensor and multi-channel wavelength solution
Instrument is adjusted to be connected, the multi-channel wavelength (FBG) demodulator is connected to computer by pci bus.
2. the pipeline road Oil Leakage Detecting system according to claim 1 based on fiber grating, it is characterized in that: detection sensing
Device is fixed on the joint of aircraft pipeline by clip, and clip is made of aluminum alloy materials.
3. the pipeline road Oil Leakage Detecting system according to claim 1 based on fiber grating, it is characterized in that: multichannel wave
Each channel of long (FBG) demodulator arranges that 5 detection sensors, detection sensor are cascaded by optical fiber, two neighboring detection
The central wavelength of detection grating in sensor differs 15nm.
4. a kind of working method of the pipeline road Oil Leakage Detecting system based on fiber grating as described in claim 1, special
Sign be method includes the following steps:
(1) detection sensor is arranged in each joint of aircraft fuel oil, lubricating oil, hydraulic oil system pipeline by clip, each
Reference grating and detection grating, their initial center wavelength difference Δ λ have all been arranged symmetrically in detection sensor0For 5nm；
(2) it is demodulated using output wavelength of the multi-channel wavelength (FBG) demodulator to detection sensor, each Tandem 5 detections
Sensor shares 16 channels, is demodulated by way of wavelength-division multiplex, and the detection sensor on each channel is connected by optical fiber
Together, the central wavelength of the detection grating in two neighboring detection sensor differs 15nm；
It (3) the use of scan frequency is 500Hz, wave-length coverage is that the light source of 1510-1590nm gradually scans each channel, wavelength solution
Instrument is adjusted to record the wavelength data of each grating, computer is told each detection by the value of channel number and central wavelength and sensed
Thus device monitors the pipeline state of whole airplane；
(4) when oil leak occurs for some position pipeline of aircraft, the sensitive material of the detection sensor at this starts to expand, internal
Stress structure changes, and detection grating is pulled, and central wavelength becomes larger, and base material will not expand, reference grating
Central wavelength it is constant, at this point, the value of central wavelength difference Δ λ of detection grating and reference grating can become larger, suitable threshold is set
Value e, when Δ λ is greater than e, system thinks that oil leak has occurred herein, starts to alarm.
5. the working method of the pipeline road Oil Leakage Detecting system according to claim 4 based on fiber grating, feature
Be: threshold value e is 8nm.
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Families Citing this family (7)
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| CN109669053A (en) * | 2019-02-21 | 2019-04-23 | 宋成立 | Oil well Extraction rate detection device based on ultraviolet detection |
| CN109738666A (en) * | 2019-02-21 | 2019-05-10 | 宋成立 | Oil well Extraction rate detection method based on ultraviolet detection |
| CN109669051A (en) * | 2019-02-21 | 2019-04-23 | 宋成立 | It is a kind of for detecting the pipeline road of oil well Extraction rate |
| CN109669052A (en) * | 2019-02-21 | 2019-04-23 | 宋成立 | Oil well Extraction rate detection method |
| CN112629428A (en) * | 2020-11-30 | 2021-04-09 | 中山市精量光电子科技有限公司 | Device for accurately arranging fiber grating sensors in oil production pipeline |
| CN112729688B (en) * | 2021-01-12 | 2022-08-19 | 南京大学 | Oil-gas pipeline leakage detection method based on vibration and temperature double parameters |
| CN112683468B (en) * | 2021-03-09 | 2021-05-25 | 东营市奥能电器成套设备有限公司 | High-sensitivity optical fiber detection device for leakage of oil and gas pipeline |
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