CN103424378A - Portable optical-fiber-sensing apparatus for detecting concentration of flammable and explosive gases and hazardous gases - Google Patents
Portable optical-fiber-sensing apparatus for detecting concentration of flammable and explosive gases and hazardous gases Download PDFInfo
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- CN103424378A CN103424378A CN2012101481349A CN201210148134A CN103424378A CN 103424378 A CN103424378 A CN 103424378A CN 2012101481349 A CN2012101481349 A CN 2012101481349A CN 201210148134 A CN201210148134 A CN 201210148134A CN 103424378 A CN103424378 A CN 103424378A
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Abstract
A portable optical-fiber-sensing apparatus for detecting concentration of flammable and explosive gases and hazardous gases relates to applications of optical fiber sensing to the field of security monitoring on flammable and explosive gases and hazardous gases of coal mines, non-coal mines and petrochemical depots. An optical sensor is used for detection of methane, hydrogen sulfide, carbon monoxide, carbon dioxide or alkanes oil gas, instead of a catalytic combustion sensor or an infrared sensor. The apparatus is high in precision, rapid in response, not affected by temperature and humidity, non-electric intrinsically safe, and long in service life. The optical fiber gas concentration sensing system consists of an optical fiber sensor, an optical-path circuit module and a system software. Different gases are modulated with different-wavelength lasers, and the lasers are transmitted to an open-type gas chamber via an optical fiber. Multiple pairs of lens reflectors are disposed in the gas chamber and make the lasers reciprocate in the gas chamber, and the lasers are interfered by a to-be detected gas and return to the optical-path circuit module for analysis, and are converted into electrical signals which are processed by the portable gas detection apparatus for uploading and alarming. The optical fiber sensor comprises an outer filter screen, the open-type gas chamber and the multiple pairs of lens reflectors.
Description
Technical field:
Patent of the present invention relates to optical fiber sensing technology and monitors the application in field in inflammable and explosive, the toxic and harmful concentration safety detection of the operating environment existence such as coal mine, non-coal mine exploitation smelting, oil depot cave depot oil tank, oil refining industry.
Background technology:
Outside Present Domestic, coal mine methane (CH no matter
4), the exploitation of carbon monoxide (CO) gas-monitoring, non-coal mine smelts carbon monoxide (CO), carbon dioxide (CO
2), sulfuretted hydrogen (H
2S), sulfur dioxide gas (SO
2), oil depot cave depot oil tank hydrocarbon, alkanes vapour, diesel oil mixed gas, oil refining industry CH
4, CO, CO
2, H
2That the operating environment such as S, NO exists is inflammable and explosive, toxic and harmful, concentration detect and substantially take catalytic combustion type sensor and infrared type sensor.
Catalytic combustion type sensor energising work, temperature high (400～500 ℃), be subject to environment temperature, humidity effect to need greatly, weekly the easy poison deactivation of catalysis element, serviceable life in adjustment, sensor to be no more than 12 months; The infrared type sensor is subject to environment temperature, humidity effect large, job insecurity, can't accurately report to the police, usually do auxiliary qualitative monitoring and use.This two classes sensor all need energising and power consumption large, be limited by fire-proof and explosion-proof requirement, down-hole can't widespread use, and the oil depot cave depot is worried sensor and the transmission cable electric leakage is on fire also limits widespread use.
In view of technological deficiency, application restric-tion, the monitoring of traditional sensors not in place, domestic coal mine gas from explosion, oil storing, Petrochemical Enterprises have large-sized fire to occur more, the serious accidents such as non-coal mine toxic and harmful murder by poisoning etc., cause very big loss to life and property.
Fibre Optical Sensor is nearly ten years emerging technologies that grow up.The different organic and inorganic gases such as methane, carbon monoxide, sulfuretted hydrogen, sulphuric dioxide, carbon dioxide, hydrocarbon alkanes gasoline, diesel oil mixed gas have absorption to different specific wavelength laser, and be linearity curve with concentration change, these are certified in the Fibre Optical Sensor laboratory.Optical fiber gas concentration sensing technology reliability application is affected and accurate, stable, reliable monitoring, alarming in actual environment monitoring, the temperature of eliminating the monitoring field environment, humidity, dust, form essential safety, easy to maintenance, can widespread use, fiber gas sensor and analytic system thereof that cost performance is good, be the important topic of current new technology application.
Summary of the invention:
The present invention is directed to gas with various adopts different wave length laser to occur, the modulation treatment system, laser after modulation is passed into to open detection gas air chamber through optical fiber, take lens reflector to pick light signal, the powder metallurgy filtrator prevents the tiny globule, dust enters air chamber, and clear up easily the enclosed structure measure, laser after tested gas absorption impact is transferred to system light path via returning to optical fiber, circuit module carries out analyzing and processing, and the output detections electric signal is to portable gas concentration detector main body, realize that Fibre Optical Sensor is to all kinds of specific inflammable and explosive, toxic and harmful concentration in real time, accurately monitoring, analyze, report to the police.The present invention is embedded into light path module, the circuit module of fiber gas sensor, LASER Light Source, modulation and Signal Analysis System, setting and warning in conventional portable gas concentration detector main body, replace conventional catalyst combustion-type or infrared type sensor, form New Generation of Portable optical fiber methane (or carbon monoxide or sulfuretted hydrogen or sulphuric dioxide or nitrogen monoxide or carbon dioxide or bavin, gasoline mix) gas concentration detector.
The optical fiber gas concentration sensor has that measuring accuracy is high, fast response time, be not subject to that environment temperature and humidity affects, working stability, the complete non-electricity of light of sensor itself, essential safety, the advantages such as low energy consumption, the adjustment cycle is long, easy to maintenance, reach more than 3 years serviceable life, cost performance is good are alternative conventional catalyst combustion-type and the essential safety of infrared type electric transducer, the new generation product of advanced technology.It is released increases the density of setting of colliery gas (principal ingredient methane, carbon monoxide) and other toxic and harmful monitoring points, reliability, the security of raising monitoring by denumerable times, alleviate the injury of non-coal mine toxic and harmful to personnel, to oil depot cave depot storage tank and pipeline, the monitoring of oil refining environment oil and gas leakage, fire alarm in advance, thereby the casualties of avoiding and disaster, guarantee safety in production.
The present invention includes: optical fiber gas concentration sensor, light sensing light source generation Modulation analysis light path module and light sense circuitry modules.
It is characterized in that: fiber gas sensor is arranged on portable fiber-optic detector outside, and an open air chamber is arranged in fiber gas sensor;
Specific wavelength laser for gas with various is produced by laser instrument, inject the lens reflector system of air chamber by optical fiber after modulation, specific wavelength laser is after several pull open in the air chamber air between the lens reflector of certain distance transmission and are interfered by tested gas, enter again Optical Fiber Transmission to optical fiber gas concentration analyzing and processing light path, circuit module is detected analyzing and processing, and the gas concentration parameter detected is converted to the electric signal that the gas concentration detector main body can identify issues the gas concentration detector main body, carry out tested gas concentration data transmission by the gas concentration detector main body by preassigned pattern again, report to the police, store,
The laser of specific wavelength can be the laser of uniform emission, can be also modulated impulse ejection laser; Can be wavelength-modulated laser, also intensity modulation laser;
External environment gas comprise monitored gas can be in the powder metallurgy filter screen through special setting hole latus rectum without pressure reduction ground, the open air chamber of penetration sensor easily;
Specific wavelength laser detected gas in air chamber is interfered, and optical wavelength or light intensity change and linear change with the gas bulk concentration;
For reducing not that the only a few dust that is leaked filter by filter screen enters air chamber and because gravity is fallen the lens reflector end face and affected Laser Transmission, the lensed endface of lens reflector and the vertical placement of ground maintenance;
Due to the monitoring field environment exist dust, and the tiny globule, may Partial Blocking powder metallurgy filter screen or have that dust is fallen the lens surface of lens reflector, laser beam is blocked and without light signal, now Circuits System will detect light path abnormal and and alarm;
Because the monitoring field environment is severe, powder metallurgy filter structure tool metal support arm supporting and firm, filter screen part is taked the empty set structure with the optical fiber lens reflector sections, is avoided directly being connected with its internal sensor air chamber, filter screen support arm and portable fiber-optic detector shell are taked screw thread or bolt mechanical attachment, and cleaning dust for convenience detach, the globule reach and more renew part.
Fiber gas sensor itself is without electricity, full light, essential safety; The detection analysis process system of the laser generator of fiber-optic fiber gas detector, Laser Modulation, back light signal and to laser instrument power supply, light signal power transformation signal, signal stores, electric signal is installed in portable fiber-optic gas detecting instrument inside to Portable exhaust gas analyzer transmission, warning system, and itself and external environment are the flame proof essential safety.
The present invention do not change former portable inflammable and explosive, toxic and harmful detector in-line power, the alerting signal setting parameter, the data storage, report to the police, control substation and then transmit to Surveillance center in the function situation of monitored gas concentration signal to collection, only conventional catalyst combustion-type or the change of infrared-gas concentration electric transducer device are reached to the light path matched with it for fiber gas sensor, electric circuit inspection analytic system device, thereby realize the optical fiber gas concentration sensor monitoring to specific gas, realize that accuracy of detection is high, fast response time, not affected by environment temperature and humidity, the non-electricity of Sensor section, detector essential safety and working service are convenient, the advantage of long service life.
The accompanying drawing explanation:
Fig. 1 is that the portable fiber-optic sensing is inflammable and explosive, toxic and harmful concentration detector one-piece construction figure.
Fig. 2 is the fiber gas sensor structural drawing.
Fig. 3 is the optical fiber gas sensing chamber structural drawing.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is done to concrete implementation:
In conjunction with Fig. 1～3, the present invention includes: Portable exhaust gas analyzer onsite alarming device (1), Portable exhaust gas analyzer external power supply and signal transfer connector (2), Portable exhaust gas analyzer main system module (3), power supply, signal cable (4), light sensing light source generation Modulation analysis light path module (5), signal optical fibre (6), sensor hitch (7), left of air chamber (8), sensor outside framework (9), powder metallurgy filter screen (10), light sense circuitry modules (11), hand-held analyzer shell (12), lens reflector group (A1, A2～F1, F2) (13), right of air chamber (14), joint pin (15).
Embodiment: the present invention is partly: optical fiber gas concentration sensor (Fig. 2), light sensing light source generation Modulation analysis light path module (5) and light sense circuitry modules (11).
Light sense circuitry modules (11) sends the gas concentration inspect electric signal by power supply, signal cable (4) to (3) power taking of former Portable exhaust gas analyzer main system module and to it; Light sense circuitry modules (11) is powered and modulation, analysis circuit system is provided to light sensing light source generation Modulation analysis light path module (5); Light sensing light source generation Modulation analysis light path module (5) produce specific wavelength laser and after modulation the light upstream end (Fig. 3) by optical fiber (6) enter into optical fiber gas concentration sensor (Fig. 2); The optical fiber gas concentration sensor connects with hand-held analyzer shell (12) by sensor hitch (7); The sensor air chamber is rigidly connected by a joint pin (15) by left (8), right (14), and left and right embeds respectively from A1～some to lens reflector (A1, A2 to F2, B1, B2～F1, F2), corresponding (Fig. 3) one by one; The sensor air chamber is by powder metallurgy filter screen (10) and extraneous UNICOM, and ambient atmos comprises that tested gas can enter and through open air chamber (Fig. 2) without pressure reduction ground; Optical fiber (6) passes into lens reflector A1 by laser, these lens are transmitted into lens reflector A2 by laser beam, lens reflector A2 imports the laser received into optical fiber and arrives lens reflector B2 again, laser is transmitted into lens reflector B1 by lens reflector B2 again, transmission so continuously, laser finally turns back to optical fiber (6) light output end (Fig. 3) from lens reflector F1, enters light sensing light source generation Modulation analysis light path module (5); In the open air chamber of specific wavelength laser between lens reflector, pass back and forth, the specific tested gas in ambient atmos will be interfered this specific wavelength laser, be caused that optical maser wavelength or light intensity change; Return laser light is detected tested gas concentration by light sensing light source Modulation analysis light path module (5) and changes numerical value, and this numerical value is processed and is converted to electric signal by light sense circuitry modules (11) again and is dealt into former Portable exhaust gas analyzer main system module (3); Former Portable exhaust gas analyzer main system module (3) receives and detects electric signal, and send to Surveillance center to collecting the control substation and controlling substation by collection by the data that preset monitoring requirement demonstration, report to the police and fiber gas sensor is collected, thereby complete whole specific gas concentration monitoring function.
If the dust of external environment or the tiny globule see through powder metallurgy filter screen (10) and enter open air chamber, and fall on certain lens reflector stop laser by, cause the light path system of Fibre Optical Sensor not receive return laser light, at this moment the fiber gas sensor system will be sent failure alarm signal by presetting to portable gas detector, this hand-held analyzer will report to the police, upload fault-signal to collection control substation simultaneously, in order to process in time, recover normal operation.
According to the on-the-spot dust pollution situation of monitoring of environmental, the fiber-optic fiber gas detector is produced and applying unit will stipulate the Changqing of powder metallurgy filter screen reason, replacing time, guarantees use safety.
Claims (11)
1. the portable fiber-optic sensing is inflammable and explosive, toxic and harmful concentration detector system is for generally all kinds of General portable catalytic combustion types or the infrared sensing formula of application are inflammable and explosive now, the toxic and harmful detector, replace catalytic combustion type sensor and infrared type sensor with the optical fiber gas concentration sensor, and original portable gas detector main body (is called for short: the detector main body, mean not other parts of air inclusion concentration sensor itself) the fundamental surveillance object, Monitoring Performance, data are processed, arq mode on data-signal, report to the police and arrange and report to the police, detector inside is soft, hardware is constant, basic shell form is constant, the optical fiber gas concentration sensor has oneself independently light path, the software and hardware system of circuit.
2. optical fiber gas concentration sensing system of the present invention comprises: power supply, electric signal output circuit module and the system software of light path module and Fibre Optical Sensor occurs, modulates, analyzes in optical fiber gas concentration sensor, Fibre Optical Sensor light source.
3. the optical fiber gas concentration sensor is to the main body power taking of portable gas concentration detector and the tested gas concentration data of the external environment monitored are converted to electric signal transmit to the detector main body, comprise when the light path of optical fiber gas concentration sensor own breaks down and send coherent signal to the detector main body, the various signal modes that the optical fiber gas concentration sensor sends to the detector main body, signal amplitude etc. are formulated by original the adopted catalytic combustion type of detector main body and infrared sensing formula sensor output signal type.
4. the tested gas of optical fiber gas concentration sensor of the present invention can be: methane (CH
4) gas, carbon monoxide (CO) gas, carbon dioxide (CO
2) gas, sulfuretted hydrogen (H
2S) gas, sulphuric dioxide (SO
2) gas, nitrogen monoxide (NO) gas, various inflammable and explosive, the toxic and harmfuls of hydrocarbon alkanes (gasoline, diesel oil combination gas gas), take different wave length optical fiber gas concentration sensor and system thereof for the tested gas of difference.
5. require the difference between 4 indication different wave length optical fiber gas concentration sensors and system thereof to be: for gas with various, specific wavelength laser to be had to the interference effect that linear wavelength variations or light intensity change and take laser instrument and modulation, analysis, processing light path, circuit and the software systems of different wave length, reach the tested gas of difference is carried out to the concentration monitor analyzing and processing, and to the similar electric signal of detector main body sending mode.
Optical fiber gas concentration sensor-based system of the present invention to tested gas concentration inspect scope from 0～100%.
The optical fiber gas concentration sensor produce and the specific wavelength laser after modulation can be the laser of uniform emission, can be also pulse laser; Can be wavelength-modulated laser, can be also intensity modulation laser.
8. the optical fiber gas concentration sensor has an open air chamber, air chamber outer cover powder metallurgy filter screen, a left side in air chamber, right support is rigidly connected by a Metallic rod, left, on right support, embed some to lens reflector, the laser sent by optical fiber gas concentration sensor optical path module by Optical Fiber Transmission to lens reflector, between laser each lens reflector in air chamber, transmit, last pass back in the light path module of optical fiber gas concentration sensor and electric module and carry out signal analysis and processing by returning to optical fiber again, the complete non-electricity of optical fiber gas concentration sensor itself, essential safety.
9. the indoor lens reflector horizontal positioned of optical fiber gas concentration sensing gas, the space horizontal transport of laser between lens reflector, affect laser on the lens of falling lens reflector because leaked dust that filter enters air chamber by the powder metallurgy filter screen and see through to reduce.
The logarithm of the lens reflector in optical fiber gas concentration sensor air chamber and between distance can interfere the sensitivity of specific wavelength laser and height that accuracy of detection requires increase and decrease according to tested gas.
11. powder metallurgy filter screen set and the non-direct contact connection of left and right support in it, thereby facilitate the cleaning of powder metallurgy filter screen regular dismounting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101481349A CN103424378A (en) | 2012-05-14 | 2012-05-14 | Portable optical-fiber-sensing apparatus for detecting concentration of flammable and explosive gases and hazardous gases |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101481349A CN103424378A (en) | 2012-05-14 | 2012-05-14 | Portable optical-fiber-sensing apparatus for detecting concentration of flammable and explosive gases and hazardous gases |
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| Publication Number | Publication Date |
|---|---|
| CN103424378A true CN103424378A (en) | 2013-12-04 |
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ID=49649449
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568830A (en) * | 2014-12-18 | 2015-04-29 | 武汉六九传感科技有限公司 | Photoelectric gas sensor and detection device |
| CN104596945A (en) * | 2015-02-02 | 2015-05-06 | 北京航空航天大学 | Radio frequency (RF) fuel hazard detection device |
| CN105137500A (en) * | 2015-07-25 | 2015-12-09 | 皖江新兴产业技术发展中心 | Flue gas pretreatment device blocking monitoring device and method |
| CN109765339A (en) * | 2019-01-18 | 2019-05-17 | 广西出入境检验检疫局危险品检测技术中心 | A kind of detection of volatile hydrogen sulfide in crude oil and hazard property classification and Detection device |
-
2012
- 2012-05-14 CN CN2012101481349A patent/CN103424378A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568830A (en) * | 2014-12-18 | 2015-04-29 | 武汉六九传感科技有限公司 | Photoelectric gas sensor and detection device |
| CN104596945A (en) * | 2015-02-02 | 2015-05-06 | 北京航空航天大学 | Radio frequency (RF) fuel hazard detection device |
| CN104596945B (en) * | 2015-02-02 | 2017-04-05 | 北京航空航天大学 | Radio frequency fuel oil hazard detection device |
| CN105137500A (en) * | 2015-07-25 | 2015-12-09 | 皖江新兴产业技术发展中心 | Flue gas pretreatment device blocking monitoring device and method |
| CN109765339A (en) * | 2019-01-18 | 2019-05-17 | 广西出入境检验检疫局危险品检测技术中心 | A kind of detection of volatile hydrogen sulfide in crude oil and hazard property classification and Detection device |
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Application publication date: 20131204 |