CN201203580Y - Detector for explosion gas in a well for mine safety - Google Patents
Detector for explosion gas in a well for mine safety Download PDFInfo
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- CN201203580Y CN201203580Y CNU2008201081260U CN200820108126U CN201203580Y CN 201203580 Y CN201203580 Y CN 201203580Y CN U2008201081260 U CNU2008201081260 U CN U2008201081260U CN 200820108126 U CN200820108126 U CN 200820108126U CN 201203580 Y CN201203580 Y CN 201203580Y
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- mine safety
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Abstract
The utility model belongs to the field of anti-explosion gas detecting equipment for mine safety, especially to a borehole explosive gas detector, which is mainly composed of a light source, an absorption air chamber, a detector, a microprocessor and an amplifier. The light source, the absorption air chamber and the detector are connected to form a gas detecting sensor, a signal amplifier is connected to the detector and an A/D converter, a CPU microprocessor is connected to a pulse drive, the A/D converter, a liquid crystal display and a RS 232 interface. According to the utility model, the light energy utilization rate is high, the detecting sensibility is high, the cost is low, the stability is high, the response time is fast, the service life is long, and the production process is simple.
Description
Technical field
The invention belongs to the explosion-proof detection of gas apparatus field of mine safety, particularly a kind of well implode gas detector that is used for mine safety that constitutes based on the NDIR (Non-Dispersive Infrared) absorption techniques.
Background technology
Mine safety is present outstanding, is badly in need of solving one of emphasis problem, and is the same with traffic hazard, needs only people and note, takes preventive measures and can avoid or reduce the major accident generation.The mine particularly principal ingredient of colliery implode gas gas is a methane, and methane is inflammable, explosion hazard gases, and aerial lower explosive limit is about 5%, on be limited to 15%.The detection of gas is the matter of utmost importance of relevant safety in production in the colliery, therefore develops a kind of safe and reliable high sensitivity, high stability, and the explosion gas detector of fast-response, small size has great social significance and economic implications.
The overwhelming majority's that adopt in current domestic colliery firedamp sensor is a catalytic combustion type.Such detection technique is backward relatively, and sensing range is narrow, and intoxicating phenomenon is arranged, thereby cause wrong report or lost efficacy and promptly do not report to the police, its poor reliability, cycle nominal time is short, the calibration cost height needs in the work to work under aerobic environment, can not detect shortcomings such as 100%LEL (minimum explosion limits) concentration.
Advanced country in the world adopts the alarm of infrared detection class more, but some technology that is adopted is not suitable for the national conditions of China, and the small product size that has is big, as the alarm of general monitor ' s, some product efficiency of light energy utilization is not high, the long partially CH4 infrared sensor as City of response time.In these products almost without exception be expensive, cause alarm to cost an arm and a leg, be difficult to popularize.
Utilize the absorption characteristic of gas to be measured to infrared spectrum, the technology of examining gas concentration has very big development in recent years.It is strong wherein to adopt the sensor of infrared differential principle to have an antijamming capability, real-time accuracy height, advantage such as non-maintaining, and it has detected in the early warning at coal mine gas concentration at present as a kind of gas analysis technology fast and accurately and has been applied.
The principle of infrared gas senor is as follows: infrared light is by methane gas, and the gas molecule has absorption function to the light of specific wavelength, and in the ideal case, it absorbs obeys lambert-Bill's absorption law.As long as know effective absorption light path and the absorption coefficient of molecule on specific wavelength that light passes through, utilize the ratio of measuring incident light and emergent light, just can measure the absolute concentration of gas.
This type of infrared gas senor comprises that at least an infrared origin, a sampling absorb air chamber and a detector.Select the light of two different wave lengths to constitute difference detecting by the bandpass filter of detector, object gas is bigger to the light absorption of a wavelength, light signal reduces with the increase of object gas concentration, object gas does not absorb substantially to the light of another wavelength, can be used to monitor the reference signal of infrared light Strength Changes.Usually the light that sends of light source must pass through enough light paths, and gas could fully absorb light wave, and it is bigger therefore usually to absorb air chamber in the infrared technique, and its shortcoming is: 1. physical size is bigger, in the air chamber gas exchange to stable need time also longer.2. the luminous energy of Xu Yaoing is also big, and light beam accomplishes that uniformity is very difficult.3. with the variation of environment temperature, optical path change is bigger, and is influential to measuring accuracy.
Utilize reflection make light in absorption chamber repeatedly by gas, increase effective optical absorption length and reduce physical size, be very effective way.When design absorbs air chamber, two kinds of schemes are arranged: the one, afocal utilizes optical integration ball notion, after light repeatedly reflects, the absorbing cavity internal optical density is reached unanimity, because there is not light focusing on the receiver surface, but uniform light intensity in the reception cavity, so, advantage is that signal stabilization is good, be not subjected to the influence of light path skew, the temperature working range is wide, and production technology is simple.But its shortcoming is, the efficiency of light energy utilization is low, and signal to noise ratio (S/N ratio) is low in the light signal.The 2nd, focus on class optical absorption chamber, usually with the light source be thing by optical system imaging on receiver, the length but the effective light path of this type of absorbing cavity is not easy to do, owing to selected the imaging design, the one, optics is adjusted complicated, the 2nd, bigger to the light path bias effect, with the variation of working environment, its stability is sacrificed to some extent.But the efficiency of light energy utilization is very high.
Summary of the invention
The utility model is bigger at absorbing air chamber in the infrared technique in the prior art, and physical size is bigger, and gas exchange is also longer to the stable time that needs in the air chamber; The luminous energy that needs is also big, and light beam accomplishes that uniformity is very difficult and with the variation of environment temperature, and optical path change is bigger, to the influential deficiency of measuring accuracy, and has proposed a kind of well implode gas detector that is used for mine safety.It is characterized in that, this explosion gas detector mainly by light source, absorb air chamber and detector, the CPU microprocessor, amplifier is formed; The quasi-optical resonator formula of light source 1, repeatedly reflection absorbs air chamber 2 and detector 3 connects and composes the detection of gas sensor, the input of signal amplifier 4 connects with the output of detector 3, the output of signal amplifier 4 is connected with CPU microprocessor 8 by A/D converter 5, and the drive signal end of CPU microprocessor 8 is connected to light source 1 by pulsed drive 9; The output of CPU microprocessor 8 also connects LCD 6 and RS232 interface 7. respectively
Described detector comprises detector A and detector B.
Described detector A and detector B are two infrared electro elements, with two narrow band pass filter couplings that centre wavelength is different.
Described absorption air chamber combines so that reflecting surface is opposed by two in spill spherical reflector, convex spherical catoptron or the plane mirror.
Two arrangement of mirrors forms of described absorption air chamber are two spill spherical reflectors, spill spherical reflector and convex spherical catoptron or a spill spherical reflector and a plane mirror.
Described infrared eye is placed on the light source to be on the position of optical system conjugate imaging of thing or to be arranged on the light path on the out of focus position.
Described infrared eye and light source are placed on catoptron one side together, or are placed on the reflecting surface side of two catoptrons respectively; Wherein light source is installed in the light hole of place side rearview mirror or near its reflecting surface.
Described light source is selected the fast light source of warming and cooling rate.
Described amplifier adopts the analog amplify circuit and the narrow-band filtering circuit of low drift.
The beneficial effects of the utility model:
This detector is a kind of detector that constitutes based on the NDIR (Non-Dispersive Infrared) absorption techniques, utilizes gas the absorptivity of special wavelength light to be come the concentration of gas in the testing environment with the variation of concentration.Its characteristics are: the efficiency of light energy utilization and detection sensitivity height, and cost is low, and is low in energy consumption, stability is high, response time is fast and the life-span is long, and volume is little, and operating temperature range is wide, production technology is simple, the texture ratio of this sensor instrument in the past will be simplified greatly, be easy to produce in batches, can reduce cost, the cost of sensor can all be extensive use of, be popularized in the large, medium and small colliery of China also less than 1/4 of conventional art.
Description of drawings
Fig. 1 is the structural representation that is used for the well implode gas detector of mine safety.
Fig. 2 is the absorbing cavity principle schematic that is used for the well implode gas detector of mine safety;
Fig. 3 is the amplifier section circuit theory diagrams that are used for the well implode gas detector of mine safety.
Embodiment
The utility model provides a kind of well implode gas detector that is used for mine safety.Below in conjunction with accompanying drawing method for designing of the present invention is described further:
Structural representation at the well implode gas detector that is used for mine safety shown in Figure 1, connect and compose the detection of gas sensor by light source 1, absorption air chamber 2 and detector 3, the input of signal amplifier 4 connects with the output of detector 3, the output of signal amplifier 4 is connected with CPU microprocessor 8 by A/D converter 5, and the drive signal end of CPU microprocessor 8 is connected to light source 1 by pulsed drive 9; The output of CPU microprocessor 8 also connects LCD 6 and RS232 interface 7 respectively.
The alternating signal of CPU microprocessor 8 outputs makes and sends the different pulsed light of two-way wavelength by pulsed drive 9 driving light sources 1, enters to absorb air chamber 2, and wherein one the tunnel for surveying light, and another road is a reference light; Two catoptrons (as shown in Figure 2) in absorbing air chamber 2 make the repeatedly reflection in absorbing air chamber 2 of two-way pulsed light, form an approximate optical resonator, the two-way pulsed light selects the light of two different wave lengths can constitute difference detecting by the bandpass filter of detector, object gas is bigger to surveying light absorption, light signal reduces with the increase of object gas concentration, and the light of this signal wavelength enters the detector A that adapts with it; Object gas does not absorb substantially to reference light, the light of reference wavelength enters the detector B that adapts with it, after detector 3 is converted to electric signal with light signal, amplify through signal amplifier 4, transform through A/D converter 5 again, the two ways of digital signals that obtains, being delivered to CPU microprocessor 8 carries out data processing and removes reference wavelength with signal wavelength and obtain its ratio, based on this ratio, calculate the absorptivity of gas to signal wavelength light, and then, adopting the gamma correction algorithm to obtain the concentration value of tested gas according to the measurement absorptivity and the concentration curve of standard, the result shows by LCD 6.Microprocessor is chosen as the chip of MSP430 or other similar models among the figure.Microprocessor MSP430 is by RS232 interface 7 and peripheral hardware communication;
The structure of described explosion gas detector can also adopt single light source, double detector structure, the two light sources of employing, double detector structure or two light source, simple detector structure.Place the band pass filter of an object gas corresponding wavelength in the front of a detector, place the band pass filter of a corresponding reference wavelength in the front of another detector.Above-mentioned band pass filter can be placed on the front of detector, also can be placed on the front of light source.
Fig. 3 is for being the amplifier section circuit theory diagrams that are used for the well implode gas detector of mine safety.
401 is low noise amplifier among the figure, and 402 is amplifier, and 403 is gas, and 404 is infrared light, and 405 is thermistor, and 406 is pulsed drive, and 407 is gas signal, and 408 are temperature output, and 409 is with reference to output." GND " expression ground connection among the figure, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 represents resistance, C1, C2 are electric capacity.This amplifier adopts analog amplify circuit, and adopts the narrow-band filtering circuit.
Foregoing just is used for helping to understand method of the present invention and core concept thereof; But protection domain of the present utility model is not limited to foregoing; distortion, variation or the replacement of any scheme of being done on the basis of any those skilled in the art of being familiar with in the technical scope that the utility model discloses all should be encompassed within the protection domain of the present invention.
Claims (10)
1. well implode gas detector that is used for mine safety, this explosion gas detector mainly by light source, absorb air chamber and detector, the CPU microprocessor, amplifier is formed; It is characterized in that, the quasi-optical resonator formula of light source (1), repeatedly reflection absorbs air chamber (2) and detector (3) connects and composes the detection of gas sensor, the output of the same detector of input (3) of signal amplifier (4) connects, the output of signal amplifier (4) is connected with CPU microprocessor (8) by A/D converter (5), and the drive signal end of CPU microprocessor (8) is connected to light source (1) by pulsed drive (9); The output of CPU microprocessor (8) also connects LCD (6) and RS232 interface (7) respectively.
2. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that described detector comprises detector A and detector B.
3. according to the described well implode gas detector that is used for mine safety of claim 2, it is characterized in that described detector A and detector B are two infrared electro elements, with two narrow band pass filter couplings that centre wavelength is different.
4. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that described absorption air chamber combines so that reflecting surface is opposed by two in spill spherical reflector, convex spherical catoptron or the plane mirror.
5. according to the described well implode gas detector that is used for mine safety of claim 3, it is characterized in that two arrangement of mirrors forms of described absorption air chamber are two spill spherical reflectors, spill spherical reflector and convex spherical catoptron or a spill spherical reflector and a plane mirror.
6. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that described infrared eye is placed on the light source to be on the position of optical system conjugate imaging of thing or to be arranged on the light path on the out of focus position.
7. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that described infrared eye and light source are placed on catoptron one side together, or are placed on the reflecting surface side of two catoptrons respectively; Wherein light source is installed in the light hole of place side rearview mirror or near its reflecting surface.
8. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that described light source is selected the fast light source of warming and cooling rate.
9. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that, described explosion gas detector adopts single light source, the double detector structure, place the band pass filter of an object gas corresponding wavelength in the front of a detector, place the band pass filter of a corresponding reference wavelength in the front of another detector.
10. according to the described well implode gas detector that is used for mine safety of claim 1, it is characterized in that described explosion gas detector adopts two light sources, double detector structure, or the simple detector structure, band pass filter is placed on the front of detector or is placed on the front of light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201081260U CN201203580Y (en) | 2008-05-29 | 2008-05-29 | Detector for explosion gas in a well for mine safety |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201081260U CN201203580Y (en) | 2008-05-29 | 2008-05-29 | Detector for explosion gas in a well for mine safety |
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| CN201203580Y true CN201203580Y (en) | 2009-03-04 |
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| CNU2008201081260U Expired - Fee Related CN201203580Y (en) | 2008-05-29 | 2008-05-29 | Detector for explosion gas in a well for mine safety |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102460121A (en) * | 2009-04-14 | 2012-05-16 | 艾尔威尔有限公司 | Saturation filtering ndir gas sensing methodology |
| CN103776793A (en) * | 2013-10-11 | 2014-05-07 | 天源华威集团有限公司 | Single-beam NDIR (non-dispersive infrared) gas sensor and miner helmet provided with same |
-
2008
- 2008-05-29 CN CNU2008201081260U patent/CN201203580Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102460121A (en) * | 2009-04-14 | 2012-05-16 | 艾尔威尔有限公司 | Saturation filtering ndir gas sensing methodology |
| CN102460121B (en) * | 2009-04-14 | 2014-06-04 | 艾尔威尔有限公司 | Saturation filtering ndir gas sensing methodology |
| CN103776793A (en) * | 2013-10-11 | 2014-05-07 | 天源华威集团有限公司 | Single-beam NDIR (non-dispersive infrared) gas sensor and miner helmet provided with same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090304 Termination date: 20160529 |