CN102116740A - Fiber monitoring method and device for concentration of combustible gas - Google Patents
Fiber monitoring method and device for concentration of combustible gas Download PDFInfo
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- CN102116740A CN102116740A CN2010106216143A CN201010621614A CN102116740A CN 102116740 A CN102116740 A CN 102116740A CN 2010106216143 A CN2010106216143 A CN 2010106216143A CN 201010621614 A CN201010621614 A CN 201010621614A CN 102116740 A CN102116740 A CN 102116740A
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Abstract
The invention relates to a safe monitoring technology of a combustible gas in petroleum refining, storage, transportation, liquefied petroleum gas stations and the like, in particular to a fiber monitoring method and device for the concentration of a combustible gas. In the invention, a fiber doped with a photosensitive material is adopted, the spectral frequencies and the wavelengths of methane, butane and the like are respectively written into a fiber core by using a micro laser technology, and the fiber is manufactured into a monitoring sensor and an optical cable by using a high molecular insulating material. A monitoring information demodulator is set according to the spectral frequency and the wavelength of the monitored gas, and the fiber sensor identifies the monitored gas according to the designed spectral frequency and wavelength and transmits the information to the demodulator. The problem that a fiber monitors the gas concentration of methane and butane on line and in real time is solved.
Description
One, technical field:
The present invention relates to a kind of petroleum refining, storage, transportation, oil liquefied gas station etc., the safety monitoring technology of inflammable gas, particularly a kind of combustable gas concentration fiber-optic monitoring method and device.
Two, background technology:
Contain in crude oil, gasoline, lightweight oil, the rock gas and volatile methane, butane etc., content surpasses 60g/m in the air
3The time 〉=55 ℃ or meet fire can blast, so the flash-point value of national standard strict regulations hydro carbons is 〉=55 ℃.The security of the combustable gas concentration monitoring of oil movement and storage, gas station, chemical plant, refinery and reliability are to guarantee to have the gordian technique that the inflammable gas materials safety is produced and stored, transports.The electronic monitoring equipment that adopt in present inflammable and explosive place can accurately not analyzed the content of methane, butane, and just there is unsafe factor in live monitoring itself.
Three, summary of the invention:
Purpose of the present invention is exactly the above-mentioned defective that exists at prior art, and a kind of combustable gas concentration fiber-optic monitoring method and device of avoiding live monitoring is provided.
A kind of combustable gas concentration fiber-optic monitoring method, its technical scheme is to be realized by following steps:
(1), adopt the optical fiber support by the arm photochromics, respectively the spectral frequency of gas to be detected and wavelength are write fibre core with little laser technology and make sensor;
(2), fiber optic and optical information (FBG) demodulator be placed in Control Room or the duty room, described sensor is placed on the position that needs monitoring respectively; Fiber optic and optical information (FBG) demodulator can detect a plurality of sensors simultaneously, fiber optic sends high-rate laser and passes to sensor by optical cable during work, sensor can accurately be discerned the frequency and the wavelength of gas to be detected by laser in the gas of complexity, and at any time detection information is passed to the optical information (FBG) demodulator by optical cable; The optical information (FBG) demodulator is the monitoring information of analytical calculation sensor at any time, and result of calculation is presented on the screen of computing machine and stored record automatically at any time, exceeds design warning index and reports to the police automatically at any time, is coded in the position of display alarm simultaneously on the display screen by sensor.
The above-mentioned optical fiber of supporting by the arm photochromics is meant in the process of making optical fiber and mixes 6% Ge, writes phase grating with the Ultra-Violet Laser method of writing direct in the fibre core of optical fiber, is implemented in light filter or the catoptron of scribing an arrowband in the fibre core; Filter settings the spectral frequency and the wavelength of detected gas, make spectral frequency and wavelength that sensor is only discerned design.
Above-mentioned gas to be detected is inflammable gass such as methane, butane.
A kind of combustable gas concentration fiber-optic monitoring device, its technical scheme is: mainly by fiber optic, the optical information (FBG) demodulator, monitoring optical cable and sensor with the insulating polymeric material armouring are formed, described fiber optic and optical information (FBG) demodulator are placed in Control Room or the duty room, described fiber optic and optical information (FBG) demodulator are connected a plurality of sensors by the monitoring optical cable of insulating polymeric material armouring, fiber optic sends high-rate laser and passes to each sensor by the monitoring optical cable of insulating polymeric material armouring, described sensor can accurately identify the frequency and the wavelength of gas to be detected by laser, and at any time the monitoring optical cable of detection information by the insulating polymeric material armouring is returned to the optical information (FBG) demodulator.
The invention has the beneficial effects as follows: adopt the specialty optical fiber of supporting by the arm photochromics, respectively the spectral frequency and the wavelength of methane, butane etc. are write fibre core, optical fiber fabrication is become monitoring sensor and optical cable with insulating polymeric material with little laser technology.Spectral frequency and wavelength according to monitoring gas are provided with the monitoring information (FBG) demodulator, Fibre Optical Sensor identifies monitoring gas and information passed to (FBG) demodulator according to the spectral frequency and the wavelength of design, solved optical fiber on-line real time monitoring methane, butane, etc. the problem of gas concentration.
Four, description of drawings:
Accompanying drawing 1 is a structural representation of the present invention;
Accompanying drawing 2 is screen display figure of computing machine of the present invention;
Among the last figure: 1, fiber optic; 2, optical information (FBG) demodulator; 3, use the monitoring optical cable of insulating polymeric material armouring; 4, sensor; 5, monitoring sensor numbering; 6, monitoring gas concentration; 7, laser power monitor shows.
Five, embodiment:
1-2 in conjunction with the accompanying drawings, the invention will be further described:
A kind of combustable gas concentration fiber-optic monitoring method, its technical scheme is to be realized by following steps:
(1), adopt the optical fiber support by the arm photochromics, respectively the spectral frequency of methane, butane and wavelength are write fibre core with little laser technology and make sensor; This sensor can change (FBG) demodulator by the spectral frequency of discerning gas to calculate corresponding gas concentration by gases such as wavelength identification methane, butane from various mixed gass;
(2), fiber optic and optical information (FBG) demodulator be placed in Control Room or the duty room, sensor is placed on the position that needs monitoring respectively; Fiber optic and optical information (FBG) demodulator can detect 40 sensors simultaneously, fiber optic sends high-rate laser and passes to sensor by optical cable during work, sensor can accurately identify the frequency and the wavelength of gas to be detected by laser in the gas of complexity, and at any time detection information is passed to the optical information (FBG) demodulator by optical cable; The optical information (FBG) demodulator is the monitoring information of analytical calculation sensor at any time, and result of calculation is presented on the screen of computing machine and stored record automatically at any time, exceeds design warning index and reports to the police automatically at any time, is coded in the position of display alarm simultaneously on the display screen by sensor.
The principal ingredient of optical fiber is sio
zDevelopment test proof is mixed the photosensitivity that 6% Ge effectively raises optical fiber in manufacturing process.Utilize the photosensitivity of fiber optic materials: promptly extraneous incident photon and fibre core interact and cause the permanent change of latter's refractive index, under the design of computing machine and control, in fibre core, write phase grating, its essence is light filter or the catoptron of in fibre core, scribing an arrowband with the Ultra-Violet Laser method of writing direct.Filter settings the spectral frequency and the wavelength of detected gas, make spectral frequency and wavelength that sensor is only discerned design.The laser that fiber optic sends is injected to sensor by Transmission Fibers, and sensor is transferred to (FBG) demodulator to spectral frequency that leaches and wavelength reflection in mixed gas.(methane, butane spectral wavelength are respectively 1651nm, 16784nm.)
Gas concentration spectral information (FBG) demodulator is that prior art no longer describes in detail, and its hardware comprises: accurate stabilized voltage supply, photo-translating system, slope oscillator, wave filter, amplitude modulaor, coupling mechanism, scrambler, computing machine, high-speed data acquisition card.Software comprises: mathematical model, spectral analysis.
Principle of work: for example the absorbing light spectral line of methane is 1651nm.At first we are adjusted to place near the absorbing light spectral line with Distributed Feedback Laser, then a ramp signal that changes along with the time are loaded in the laser instrument, and going to shake scanning is the frequency range at center with the absorption line of gas to be measured.When scanning, the transmission signals of reflection is received the device synchronous recording.Normalized transmission signals fluctuation constitutes absorbing light spectral line transmissivity equation with system reference point (technical 0 point that is referred to as).The concentration of signal amplitude and gas is directly proportional in the equation.Do reference by scanning whole absorbing state repeatedly zero point in conjunction with getting, system is self-calibrating in itself.Absorbing under the very weak situation, for example: the concentration of methane＜1% o'clock, directly restoring signal lacks necessary detectable sensitivity under the influence of sum of errors system noise, in order to address this problem, so we have used the amplitude modulaor of bandgap wavelength regulatory function, except laser being injected the slope concussion, we have adopted the high-frequency sine wave simultaneously.The interaction of sine wave and gas absorption spectrum line has produced amplitude-modulated signal on identical frequency.If resolution and susceptibility are without limits,, will see the absorption line transmission signals because be direct detection.Survey in the receiving end locking, recover required wavelength by amplitude-modulated signal then and just can extract the concentration of detected gas by careful signal Processing.
A kind of combustable gas concentration fiber-optic monitoring device, its technical scheme is: mainly by fiber optic (1), optical information (FBG) demodulator (2), monitoring optical cable (3) and sensor (4) with the insulating polymeric material armouring are formed, described fiber optic (1) and optical information (FBG) demodulator (2) are placed in Control Room or the duty room, described fiber optic (1) and optical information (FBG) demodulator (2) are connected a plurality of sensors (4) by the monitoring optical cable (3) of insulating polymeric material armouring, fiber optic (1) sends high-rate laser and passes to each sensor (4) by the monitoring optical cable (3) of insulating polymeric material armouring, described sensor (4) can accurately identify the frequency and the wavelength of gas to be detected by laser, and at any time the monitoring optical cable (3) of detection information by the insulating polymeric material armouring is returned to optical information (FBG) demodulator (2).With reference to accompanying drawing 2, the screen display figure of computing machine of the present invention shows a plurality of monitoring sensor numberings 5; The monitoring gas concentration 6 that each sensor is passed back; The below is that laser power monitor shows 7.
This technology compared with prior art has distinguishing feature:
1, no pyroelectric monitor.
2, use frequency and the wavelength of spectral detection gas.
3, the frequency of wanting gas-monitoring and wavelength are write fibre core with little laser technology and make sensor.
4, sensor can accurately identify by the laser of fiber optic frequency and the wavelength of gas to be detected and at any time detection information be passed to optical information (FBG) demodulator result of calculation.
5, this technology is not with a little non-conductive good insulating accuracy of identification height, anti-electromagnetic interference, lightning protection anti electrostatic.
Claims (4)
1. combustable gas concentration fiber-optic monitoring method is characterized in that being realized by following steps:
(1), adopt the optical fiber support by the arm photochromics, respectively the spectral frequency of gas to be detected and wavelength are write fibre core with little laser technology and make sensor;
(2), fiber optic and optical information (FBG) demodulator be placed in Control Room or the duty room, described sensor is placed on the position that needs monitoring respectively; Fiber optic and optical information (FBG) demodulator can detect a plurality of sensors simultaneously, fiber optic sends high-rate laser and passes to sensor by optical cable during work, sensor can accurately be discerned the frequency and the wavelength of gas to be detected by laser in the gas of complexity, and at any time detection information is passed to the optical information (FBG) demodulator by optical cable; The optical information (FBG) demodulator is the monitoring information of analytical calculation sensor at any time, and result of calculation is presented on the screen of computing machine and stored record automatically at any time, exceeds design warning index and reports to the police automatically at any time, is coded in the position of display alarm simultaneously on the display screen by sensor.
2. combustable gas concentration fiber-optic monitoring method according to claim 1, it is characterized in that: described optical fiber of supporting by the arm photochromics is meant in the process of making optical fiber and mixes 6% Ge, in the fibre core of optical fiber, write phase grating with the Ultra-Violet Laser method of writing direct, be implemented in light filter or the catoptron of scribing an arrowband in the fibre core; Filter settings the spectral frequency and the wavelength of detected gas, make spectral frequency and wavelength that sensor is only discerned gas to be detected.
3. combustable gas concentration fiber-optic monitoring method according to claim 1 is characterized in that: described gas to be detected is methane or butane.
4. combustable gas concentration fiber-optic monitoring device, it is characterized in that: mainly by fiber optic (1), optical information (FBG) demodulator (2), monitoring optical cable (3) and sensor (4) with the insulating polymeric material armouring are formed, described fiber optic (1) and optical information (FBG) demodulator (2) are placed in Control Room or the duty room, described fiber optic (1) and optical information (FBG) demodulator (2) are connected a plurality of sensors (4) by the monitoring optical cable (3) of insulating polymeric material armouring, fiber optic (1) sends high-rate laser and passes to each sensor (4) by the monitoring optical cable (3) of insulating polymeric material armouring, described sensor (4) can accurately identify the frequency and the wavelength of gas to be detected by laser, and at any time the monitoring optical cable (3) of detection information by the insulating polymeric material armouring is returned to optical information (FBG) demodulator (2).
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| CN2010106216143A CN102116740A (en) | 2010-12-28 | 2010-12-28 | Fiber monitoring method and device for concentration of combustible gas |
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| CN2010106216143A CN102116740A (en) | 2010-12-28 | 2010-12-28 | Fiber monitoring method and device for concentration of combustible gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518947A (en) * | 2011-12-06 | 2012-06-27 | 北京大方科技有限责任公司 | Real-time monitoring method for urban pipeline network leakage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08286054A (en) * | 1995-04-13 | 1996-11-01 | Sumitomo Electric Ind Ltd | Production of optical waveguide type diffraction grating |
| JPH10300671A (en) * | 1997-04-22 | 1998-11-13 | Yokogawa Electric Corp | Equipment for measuring micro particle |
| CN2559981Y (en) * | 2002-02-08 | 2003-07-09 | 武汉理工大学 | Optical fibre gas-sensitive sensing measuring apparatus |
| CN200961478Y (en) * | 2006-10-20 | 2007-10-17 | 辽河石油勘探局 | Optical fiber test cable of horizontal well for petroleum and thermal exploitation |
| CN201917520U (en) * | 2010-12-28 | 2011-08-03 | 胜利油田三力石油技术开发有限公司 | Optical fiber monitoring device for concentration of combustible gas |
-
2010
- 2010-12-28 CN CN2010106216143A patent/CN102116740A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08286054A (en) * | 1995-04-13 | 1996-11-01 | Sumitomo Electric Ind Ltd | Production of optical waveguide type diffraction grating |
| JPH10300671A (en) * | 1997-04-22 | 1998-11-13 | Yokogawa Electric Corp | Equipment for measuring micro particle |
| CN2559981Y (en) * | 2002-02-08 | 2003-07-09 | 武汉理工大学 | Optical fibre gas-sensitive sensing measuring apparatus |
| CN200961478Y (en) * | 2006-10-20 | 2007-10-17 | 辽河石油勘探局 | Optical fiber test cable of horizontal well for petroleum and thermal exploitation |
| CN201917520U (en) * | 2010-12-28 | 2011-08-03 | 胜利油田三力石油技术开发有限公司 | Optical fiber monitoring device for concentration of combustible gas |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102518947A (en) * | 2011-12-06 | 2012-06-27 | 北京大方科技有限责任公司 | Real-time monitoring method for urban pipeline network leakage |
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Application publication date: 20110706 |