CN105403373A - Diffusion type natural gas station gas leakage laser online monitoring early warning apparatus - Google Patents
Diffusion type natural gas station gas leakage laser online monitoring early warning apparatus Download PDFInfo
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- CN105403373A CN105403373A CN201510954462.1A CN201510954462A CN105403373A CN 105403373 A CN105403373 A CN 105403373A CN 201510954462 A CN201510954462 A CN 201510954462A CN 105403373 A CN105403373 A CN 105403373A
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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
- G01M3/38—Investigating fluid-tightness of structures by using light
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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
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Abstract
The invention provides a diffusion type natural gas station gas leakage laser online monitoring early warning apparatus. The apparatus comprises a central control room host unit, a display and multiple monitoring probes installed at a monitoring field, wherein the central control room host unit communicates with the display, the central control room host unit is connected with the monitoring probes through a multipath fiber, and the central control room host unit comprises a unit housing, and a switch power supply, a laser control power supply, a signal generator, a laser, a circulator, a multipath optical switch, a photoelectric detector, a front amplifier, a lock-in amplifier, a data acquisition board and an industrial control mainboard which are arranged in the unit housing. According to the invention, through the monitoring probes distributed at the monitoring field, gas concentrations at different installation positions are monitored, signals are transmitted to the central control room host unit for signal processing through the fiber, and then the gas concentrations are monitored through the display. The apparatus provided by the invention has the advantages of simple structure, rapid response speed, easy application and low maintenance cost.
Description
Technical field
The present invention relates to gas pipeline leakage detection technique field, be specifically related to a kind of laser on-line monitoring prior-warning device revealed for field, diffusion natural gas station gas.
Background technology
Gas distributing system has cross-regional wide, and the features such as operation operating mode and ambient conditions complexity, cause pipeline leakage testing to have difficulties.Current gas pipeline leakage detection technique mainly comprise cable optic fibre Leak Detection method, soundwave leakage method, based on methods such as pipeline model Leak Detection method, pressure gradient method, mass rate balancing method, suction wave method, pipe interior Magnetic Flux Leakage Inspecting, gas pipeline leakage detection technique is that multi-subject knowledge is comprehensive, various method has respective feature, merits and demerits, current employing laser absorption spectroscopy can realize online quantitatively remote measurement gas pipeline leakage, has the features such as quick, accurate, intelligent and safety.
Summary of the invention
The invention provides field, a kind of diffusion natural gas station gas and reveal laser on-line monitoring prior-warning device, its zero shift, do not disturb by ambient atmos, structure is simple, fast response time, be easy to practical, maintenance cost is low, can be widely used in numerous place such as natural gas compressor station field, field, natural gas transport station.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of field, diffusion natural gas station gas reveals laser on-line monitoring prior-warning device, comprise Central Control Room main computer unit, display and multiple monitoring probe being installed on monitoring field, described Central Control Room main computer unit is communicated with described display, described Central Control Room main computer unit is connected with described monitoring probe by multi-channel optical fibre, described Central Control Room main computer unit comprises cell enclosure and is arranged on the Switching Power Supply in this cell enclosure, laser control power supply, signal generator, laser instrument, circulator, Multichannel photoswitch, photodetector, prime amplifier, lock-in amplifier, data collecting card and industrial control mainboard,
Described laser instrument, circulator, Multichannel photoswitch connect successively, and described laser control power supply is used for the power supply of laser instrument, and described signal generator is used for the output wavelength of modulated laser;
Described prime amplifier, lock-in amplifier, data collecting card are connected successively with industrial control mainboard, the input end of described prime amplifier is connected with described circulator signal by described photodetector, described lock-in amplifier and data collecting card are connected with described signal generator respectively, are respectively used to trigger pip and the reference signal of the transmission of Received signal strength generator.
Preferably, described industrial control mainboard is by being arranged on the external described display of VGA joint in described cell enclosure.
Preferably, described Multichannel photoswitch is by being arranged on the optical fiber of the external correspondence of FC/APC fibre-optical splice in described cell enclosure.
Preferably, described signal generator can produce 10HZ sawtooth wave and 10KHZ sine wave the output wavelength of described laser instrument is modulated.
Preferably, described trigger pip is the square-wave signal of 10HZ.
Preferably, described reference signal is the reference sine wave of 10KHZ.
Preferably, described optical fiber is the armored fiber optic of single core single mode.
From above technical scheme, the present invention is by being distributed in the monitoring probe of monitoring field, monitor the gas density of different installation site, and send a signal to Central Control Room main computer unit by optical fiber and carry out signal transacting, then monitor gas density by display, structure is simple, fast response time, be easy to practical, maintenance cost is low, can be widely used in numerous place such as natural gas compressor station field, field, natural gas transport station.
Accompanying drawing explanation
Fig. 1 is structural principle block diagram of the present invention;
Fig. 2 is the structural representation of Central Control Room main computer unit.
In figure: 100, Central Control Room main computer unit, 101, cell enclosure, 102, Switching Power Supply, 103, laser control power supply, 104, signal generator, 105, laser instrument, 106, circulator, 107, Multichannel photoswitch, 108, photodetector, 109, prime amplifier, 110, lock-in amplifier, 111, data collecting card, 112, industrial control mainboard, 113, VGA joint, 114, FC/APC fibre-optical splice, 200, display, 300, monitoring probe, 400, optical fiber.
Embodiment
Below in conjunction with accompanying drawing, a kind of preferred implementation of the present invention is described in detail.
As shown in Figure 1, field, described diffusion natural gas station gas leakage laser on-line monitoring prior-warning device comprises Central Control Room main computer unit 100, display 200 and multiple monitoring probe 300 being installed on monitoring field.Described Central Control Room main computer unit 100 is communicated with described display 200, described Central Control Room main computer unit 100 is connected with described monitoring probe 300 by multi-channel optical fibre 400, monitoring probe is for monitoring the gas density of different installation site, and send a signal to Central Control Room main computer unit by optical fiber and carry out signal transacting, gas density is monitored again by display, judge whether to report to the police, relative alarm value can be arranged by upper computer software.Preferably, described optical fiber 400 adopts the armored fiber optic of single core single mode, meets the requirement of monitoring field complex environment, and described monitoring probe 300 selects uncharged type, and self is not charged, is therefore intrinsic safety.
As shown in Figure 2, described Central Control Room main computer unit 100 comprises cell enclosure 101 and is arranged on Switching Power Supply 102, laser control power supply 103, signal generator 104, laser instrument 105, circulator 106, Multichannel photoswitch 107, photodetector 108, prime amplifier 109, lock-in amplifier 110, data collecting card 111 and the industrial control mainboard 112 in this cell enclosure.
Described Switching Power Supply 102 is for the magnitude of voltage that is various boards by 220V voltage transitions.
Described laser instrument 105, circulator 106, Multichannel photoswitch 107 connect successively, described laser control power supply 103 comprises temprature control unit and Current Control part, for powering to laser instrument, in the present embodiment, laser instrument is preferably Distributed Feedback Laser, for generation of 1653nm central absorption wavelength.
Described prime amplifier 109, lock-in amplifier 110, data collecting card 111 are connected successively with industrial control mainboard 112, and the input end of described prime amplifier 109 is connected with described circulator 106 signal by described photodetector 108.
Described circulator 106 for by DFB Laser beam propagation to Multichannel photoswitch 107, arrive monitoring probe 300 through armored fiber optic, the light signal then after former road returns along separate routes arrives described photodetector 108 through circulator and carries out subsequent treatment.
Described Multichannel photoswitch 107, for light beam is divided into N road, arrives through armored fiber optic the gas density that monitoring probe monitors different installation site.
Described photodetection 108 is arranged on described prime amplifier 109, for light signal being converted to electric signal and being amplified by prime amplifier.
Described lock-in amplifier 110 and data collecting card 111 are connected with described signal generator 104 respectively, are respectively used to trigger pip and the reference signal of the transmission of Received signal strength generator.Described lock-in amplifier 110 obtains second harmonic signal and first harmonic signal for the signal after amplification is carried out demodulation, described data collecting card 111 is for gathering corresponding second harmonic signal and first harmonic signal, and described industrial control mainboard 112 is carried out subsequent treatment for the signal collected by data collecting card and obtained corresponding gas density.
Described signal generator 104 produces the sine wave of 10Hz sawtooth wave and 10KHz, can produce modulation to the output wavelength of laser instrument; The reference sine wave A of 10KHz is also provided to lock-in amplifier simultaneously, for the demodulation of signal, provides with 10Hz sawtooth wave with square-wave signal B frequently, for the harmonic signal of trigger data acquisition card collection one-period to data collecting card.
Described industrial control mainboard 112 is by the external described display 200 of VGA joint 113, described Multichannel photoswitch 107 is by the optical fiber 400 of the external correspondence of FC/APC optical fiber 114 joint, and described VGA joint 113 and FC/APC fibre-optical splice 114 can be arranged in cell enclosure 101.
Principle of work of the present invention is described below:
Monitoring probe hangs on different monitoring places, and its hanging position periphery is unobstructed, and necessarily can not cover monitoring probe.Central Control Room Distributed Feedback Laser exports the centre wavelength of 1653nm under the effect of laser control power supply and signal generator, and under the 10Hz sawtooth wave of signal generator generation and the sine wave effect of 10KHz, Output of laser is modulated, laser after modulation arrives Multichannel photoswitch through circulator, outputs to the monitoring probe at different monitoring points place after photoswitch switches; Again circulator is back to through armored fiber optic after the methane gas of laser through monitoring probe inside absorbs, electric signal is converted to by photoelectric detector after circulator, then through prime amplifier amplify after by lock-in amplifier demodulation, obtain once and second harmonic signal, signal is sent into industrial control mainboard and is carried out follow-up data processing and gas density inverting after data collecting card collection.
The above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (7)
1. field, diffusion natural gas station gas reveals laser on-line monitoring prior-warning device, comprise Central Control Room main computer unit (100), display (200) and multiple monitoring probe (300) being installed on monitoring field, described Central Control Room main computer unit (100) is communicated with described display (200), described Central Control Room main computer unit (100) is connected with described monitoring probe (300) by multi-channel optical fibre (400), it is characterized in that, described Central Control Room main computer unit (100) comprises cell enclosure (101) and is arranged on the Switching Power Supply (102) in this cell enclosure, laser control power supply (103), signal generator (104), laser instrument (105), circulator (106), Multichannel photoswitch (107), photodetector (108), prime amplifier (109), lock-in amplifier (110), data collecting card (111) and industrial control mainboard (112),
Described laser instrument (105), circulator (106), Multichannel photoswitch (107) connect successively, described laser control power supply (103) is for the power supply of laser instrument (105), and described signal generator (104) is for the output wavelength of modulated laser (105);
Described prime amplifier (109), lock-in amplifier (110), data collecting card (111) are connected successively with industrial control mainboard (112), the input end of described prime amplifier (109) is connected with described circulator (106) signal by described photodetector (108), described lock-in amplifier (110) is connected with described signal generator (104) respectively with data collecting card (111), is respectively used to trigger pip and the reference signal of the transmission of Received signal strength generator.
2. field, diffusion natural gas station according to claim 1 gas reveals laser on-line monitoring prior-warning device, it is characterized in that, described industrial control mainboard (112) is by being arranged on the external described display (200) of VGA joint (113) in described cell enclosure (101).
3. field, diffusion natural gas station according to claim 1 gas reveals laser on-line monitoring prior-warning device, it is characterized in that, described Multichannel photoswitch (107) is by being arranged on the optical fiber (400) of FC/APC fibre-optical splice (114) the external correspondence in described cell enclosure (101).
4. field, diffusion natural gas station according to claim 1 gas reveals laser on-line monitoring prior-warning device, it is characterized in that, described signal generator (104) can produce 10HZ sawtooth wave and 10KHZ sine wave is modulated the output wavelength of described laser instrument (105).
5. field, diffusion natural gas station according to claim 1 gas reveals laser on-line monitoring prior-warning device, and it is characterized in that, described trigger pip is the square-wave signal of 10HZ.
6. field, diffusion natural gas station according to claim 1 gas reveals laser on-line monitoring prior-warning device, and it is characterized in that, described reference signal is the reference sine wave of 10KHZ.
7. field, diffusion natural gas station according to claim 1 gas reveals laser on-line monitoring prior-warning device, and it is characterized in that, described optical fiber (400) is the armored fiber optic of single core single mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510954462.1A CN105403373A (en) | 2015-12-20 | 2015-12-20 | Diffusion type natural gas station gas leakage laser online monitoring early warning apparatus |
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| CN201510954462.1A CN105403373A (en) | 2015-12-20 | 2015-12-20 | Diffusion type natural gas station gas leakage laser online monitoring early warning apparatus |
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Cited By (5)
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| CN106092963A (en) * | 2016-06-01 | 2016-11-09 | 武汉六九传感科技有限公司 | The laser methane concentration monitoring device of multi-angle fast tunable |
| CN108593597A (en) * | 2018-01-26 | 2018-09-28 | 西安捷亿达能源科技有限公司 | Natural gas leaking early warning monitoring device and method based on optical fiber FP lumen type probe |
| CN109360381A (en) * | 2018-12-05 | 2019-02-19 | 大连兰特科技有限公司 | A kind of gas transmission station combustible gas leakage laser acquisition early warning system |
| CN110702625A (en) * | 2019-10-16 | 2020-01-17 | 安徽中科智泰光电测控科技有限公司 | Coal mine spontaneous ignition prevention monitoring system based on optical fiber sensing and laser spectrum analysis |
| CN114607944A (en) * | 2022-02-24 | 2022-06-10 | 之江实验室 | Natural gas pipeline leakage monitoring device and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092963A (en) * | 2016-06-01 | 2016-11-09 | 武汉六九传感科技有限公司 | The laser methane concentration monitoring device of multi-angle fast tunable |
| CN108593597A (en) * | 2018-01-26 | 2018-09-28 | 西安捷亿达能源科技有限公司 | Natural gas leaking early warning monitoring device and method based on optical fiber FP lumen type probe |
| CN109360381A (en) * | 2018-12-05 | 2019-02-19 | 大连兰特科技有限公司 | A kind of gas transmission station combustible gas leakage laser acquisition early warning system |
| CN110702625A (en) * | 2019-10-16 | 2020-01-17 | 安徽中科智泰光电测控科技有限公司 | Coal mine spontaneous ignition prevention monitoring system based on optical fiber sensing and laser spectrum analysis |
| CN114607944A (en) * | 2022-02-24 | 2022-06-10 | 之江实验室 | Natural gas pipeline leakage monitoring device and method |
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