CN103398976B - Reflective open circuit laser gas detection system - Google Patents
Reflective open circuit laser gas detection system Download PDFInfo
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- CN103398976B CN103398976B CN201310291029.5A CN201310291029A CN103398976B CN 103398976 B CN103398976 B CN 103398976B CN 201310291029 A CN201310291029 A CN 201310291029A CN 103398976 B CN103398976 B CN 103398976B
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Abstract
The invention provides reflective open circuit laser gas detection system, comprise there is A/D converter MCU treatment circuit, signal generating circuit, laser instrument, main road beam shaping mechanism, Space Angle catoptron, main road detector and signal amplification circuit, described MCU treatment circuit connects described signal generating circuit, and described signal generating circuit connects described laser instrument; Described main road detector connects the A/D converter of described MCU treatment circuit by described signal amplification circuit; The laser incidence end of the corresponding described main road beam shaping mechanism of described laser instrument is arranged, and described main road detector is arranged by the laser emitting end of the corresponding described main road beam shaping mechanism of described Space Angle catoptron.Time the present invention uses, due to the effect of Space Angle catoptron, as transmitting terminal together with transmitter unit can be located at receiving element, transmitter unit and receiving element share a MCU treatment circuit, and synchronism, real-time and concertedness are improved greatly.
Description
Technical field
The present invention relates to reflective open circuit laser gas detection system.
Background technology
Along with the develop rapidly of industrialization and market economy, energy demand is increased severely.Annual Natural Gas In China output in 2012 increases by 6.5% on a year-on-year basis and reaches 1077 billion cubic meters, through measuring and calculating, environment measuring in exploitation, process and conveying process, reaches more than 500,000 to the newly-increased annual requirement of the gas such as methane inspection checkout equipment, and with annual 20% to 30% speed increment.Oil gas exploitation, collect in defeated process, various forms of leakage will have a strong impact on atmospheric environment and people life property safety.Due to the backwardness of detection technique and management level, accident often has generation, not only causes huge loss to economy, also result in bad social influence, causes pollution to environment.Methane is the principal combustible components of rock gas, and be simultaneously again a kind of potent greenhouse gases, the greenhouse effect of methane are more than 20 times of carbon dioxide, is to be only second to the greenhouse gases that No. second of carbon dioxide can cause global warming in earth atmosphere.In order to avoid environmental pollution and minimizing greenhouse effect, guarantee safe production and social stability, detect hazardous location Leakage Gas really must go, in the existing various systems for detecting hazardous location gas inspection Concentration Testing, wherein a kind of is open circuit methane laser gas detection system, this system comprises transmitter unit and receiving element, transmitter unit comprises MCU treatment circuit, signal generating circuit, laser instrument, main road beam shaping mechanism and power circuit, receiving element comprises the lens converging laser, main road detector, signal amplification circuit, MCU treatment circuit and signal output apparatus, MCU treatment circuit controls laser instrument by signal generating circuit and sends laser, main road beam shaping mechanism carries out directive receiving element after shaping to laser, received by main road detector after laser scioptics, convert light signal to electric signal, then carry out process by MCU treatment circuit after being amplified by signal by signal amplification circuit to calculate, draw the cumulative concentration of gas and exported by signal output apparatus, once methane gas exceeds standard, controlling warning horn and report to the police.But this open circuit methane gas detection system also exists some shortcomings, the first, and transmitter unit and receiving element use independently MCU treatment circuit respectively, and synchronism, real-time and concertedness are not high, affect testing result; The second, due to the impact of various factors, often there is certain centre wavelength drift phenomenon by the laser that signal generating circuit drive laser sends in MCU treatment circuit, has a negative impact to measurement result, time serious, cause and measure unsuccessfully.
Summary of the invention
The object of this invention is to provide reflective open circuit laser gas detection system, use MCU processor respectively and the synchronism, real-time and the concertedness that produce are not high to solve transmitter unit and receiving element in existing system, affect the problem of testing result.
To achieve these goals, the technical solution adopted in the present invention is: reflective open circuit laser gas detection system, it comprise there is A/D converter MCU treatment circuit, signal generating circuit, laser instrument, main road beam shaping mechanism, Space Angle catoptron, main road detector and signal amplification circuit
Described MCU treatment circuit connects described signal generating circuit to produce the modulation signal realized needed for gas center length scanning to be measured, and described signal generating circuit connects described laser instrument to be sent the laser realized needed for gas center length scanning to be measured by described laser instrument according to modulation signal;
Described main road detector connects the A/D converter of described MCU treatment circuit the electric signal detected is exported gas concentration signal to be measured through amplifying the backward described MCU treatment circuit of process by described signal amplification circuit;
The laser incidence end of the corresponding described main road beam shaping mechanism of described laser instrument is arranged, and described main road detector is arranged by the laser emitting end of the corresponding described main road beam shaping mechanism of described Space Angle catoptron.
Based on above-mentioned, it also comprises optical branching device, reference beam reshaping device, sealed air chamber, is stored in described sealed air chamber and the gas to be measured of known gas concentration and reference detector;
Described reference detector by described signal amplification circuit connect described MCU treatment circuit A/D converter in case by the electric signal detected through amplify the backward described MCU treatment circuit of process and export gas concentration reference signal to be measured and make described MCU treatment circuit according to described gas concentration reference signal to be measured and described known gas concentration compare the generation adjusting described modulation signal;
The input end of the corresponding described optical branching device of described laser instrument is arranged, two output terminals corresponding described main road beam shaping mechanisms of difference of described optical branching device and the laser incidence end of described reference beam reshaping device are arranged, and the laser emitting end of described reference beam reshaping device is corresponding in turn to described sealed air chamber, described reference detector is arranged.
Based on above-mentioned, described Space Angle catoptron by multiple be arranged in parallel for the refractive prism of parallel for incident light injection is formed.
Based on above-mentioned, it also comprises angular adjustment apparatus, and described Space Angle catoptron is located on described angular adjustment apparatus.
Based on above-mentioned, it also comprises with reference to adjusting gear, and described reference beam reshaping device, described sealed air chamber and described reference detector are located at described with reference on adjusting gear.
Time the present invention uses, laser reflexes on main road detector through Space Angle catoptron, and main road detector connects the A/D converter of MCU treatment circuit the electric signal detected is exported gas concentration signal to be measured through amplifying the backward described MCU treatment circuit of process by signal amplification circuit; Due to the effect of Space Angle catoptron, as transmitting terminal together with transmitter unit can be located at receiving element, Space Angle catoptron is as reflection end, substantially reduce the volume of device, again because transmitter unit and receiving element share a MCU treatment circuit, synchronism, real-time and concertedness are improved greatly, testing result precision is improved.
Further, reference detector receiving optical signals, and by signal amplification circuit connect MCU treatment circuit A/D converter in case by the electric signal detected through amplify the backward described MCU treatment circuit of process and export gas concentration reference signal to be measured and make described MCU treatment circuit according to described gas concentration reference signal to be measured and described known gas concentration compare the generation adjusting described modulation signal, object adjusts the laser realized needed for gas center length scanning to be measured; Owing to there is a feedback ratio comparatively, like this when drift appears in the centre wavelength of laser time, can feedback information in time, MCU treatment circuit can carry out adjustment promptly and accurately, to eliminate centre wavelength drift phenomenon.
Accompanying drawing explanation
Fig. 1 is the local system figure of reflective open circuit laser gas detection system in the embodiment of the present invention;
Fig. 2 is the system diagram of reflective open circuit laser gas detection system in the embodiment of the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
The embodiment of reflective open circuit laser gas detection system
Embodiment 1
As shown in Figure 1, it comprises transmitter unit, receiving element and Space Angle catoptron, transmitter unit has the MCU treatment circuit of A/D converter, signal generating circuit, laser instrument, main road beam shaping mechanism, receiving element has main road detector and signal amplification circuit, described MCU treatment circuit connects described signal generating circuit to produce the modulation signal realized needed for gas center length scanning to be measured, described signal generating circuit connects described laser instrument to be sent the laser realized needed for gas center length scanning to be measured by described laser instrument according to modulation signal, described main road detector connects the A/D converter of described MCU treatment circuit the electric signal detected is exported gas concentration signal to be measured through amplifying the backward described MCU treatment circuit of process by described signal amplification circuit, the laser incidence end of the corresponding described main road beam shaping mechanism of described laser instrument is arranged, and described main road detector is arranged by the laser emitting end of the corresponding described main road beam shaping mechanism of Space Angle catoptron.Space Angle catoptron by multiple be arranged in parallel for the refractive prism of parallel for incident light injection is formed, Space Angle catoptron is located on described angular adjustment apparatus, angular adjustment apparatus, for adjusting the angle of Space Angle catoptron, is existing apparatus, does not repeat at this.
Time the present invention uses, power circuit (not shown) is that open circuit laser gas detection system is powered, laser reflexes on main road detector through Space Angle catoptron, and main road detector connects the A/D converter of MCU treatment circuit the electric signal detected is exported gas concentration signal to be measured through amplifying the backward described MCU treatment circuit of process by signal amplification circuit; Due to the effect of Space Angle catoptron, as transmitting terminal together with transmitter unit can be located at receiving element, Space Angle catoptron is as reflection end, substantially reduce the volume of device, transmitter unit and receiving element share a MCU treatment circuit, synchronism, real-time and concertedness are improved greatly, testing result precision is improved.
In other embodiments of the invention, as different from Example 1, Space Angle catoptron can also be other Space Angle reflection unit existing, can use as long as meet above-mentioned request for utilization in this programme.
Embodiment 2
As shown in Figure 2, as different from Example 1, this reflective open circuit laser gas detection system also comprises optical branching device, reference beam reshaping device, sealed air chamber, is stored in described sealed air chamber and the gas to be measured of known gas concentration and reference detector; Described reference detector by described signal amplification circuit connect described MCU treatment circuit A/D converter in case by the electric signal detected through amplify the backward described MCU treatment circuit of process and export gas concentration reference signal to be measured and make described MCU treatment circuit according to described gas concentration reference signal to be measured and described known gas concentration compare the generation adjusting described modulation signal; The input end of the corresponding described optical branching device of laser instrument is arranged, two output terminals corresponding described main road beam shaping mechanisms of difference of described optical branching device and the laser incidence end of described reference beam reshaping device are arranged, and the laser emitting end of described reference beam reshaping device is corresponding in turn to described sealed air chamber, described reference detector is arranged; Also comprise with reference to adjusting gear, reference beam reshaping device, sealed air chamber and reference detector are located at described with reference on adjusting gear; Reference adjusting gear is existing apparatus, does not repeat at this.
In the course of work, reference detector receiving optical signals, and by signal amplification circuit connect MCU treatment circuit A/D converter in case by the electric signal detected through amplify the backward described MCU treatment circuit of process and export gas concentration reference signal to be measured and make described MCU treatment circuit according to described gas concentration reference signal to be measured and described known gas concentration compare the generation adjusting described modulation signal, to adjust the laser realized needed for gas center length scanning to be measured; Owing to there is a feedback ratio comparatively, like this when drift appears in the centre wavelength of laser time, can feedback information in time, MCU treatment circuit can carry out adjustment promptly and accurately, to eliminate laser center wavelength drift phenomenon.
This reflective open circuit laser gas detection system can be used for detecting methane gas, also may be used for detecting other gas, and when detecting methane gas, the centre wavelength of laser is 1.66um.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (5)
1. reflective open circuit laser gas detection system, is characterized in that: it comprise there is A/D converter MCU treatment circuit, signal generating circuit, laser instrument, main road beam shaping mechanism, Space Angle catoptron, main road detector and signal amplification circuit,
Described MCU treatment circuit connects described signal generating circuit to produce the modulation signal realized needed for gas center length scanning to be measured, and described signal generating circuit connects described laser instrument to be sent the laser realized needed for gas center length scanning to be measured by described laser instrument according to modulation signal;
Described main road detector connects the A/D converter of described MCU treatment circuit the electric signal detected is exported gas concentration signal to be measured through amplifying the backward described MCU treatment circuit of process by described signal amplification circuit;
The laser incidence end of the corresponding described main road beam shaping mechanism of described laser instrument is arranged, and described main road detector is arranged by the laser emitting end of the corresponding described main road beam shaping mechanism of described Space Angle catoptron.
2. reflective open circuit laser gas detection system according to claim 1, is characterized in that: it also comprises optical branching device, reference beam reshaping device, sealed air chamber, is stored in described sealed air chamber and the gas to be measured of known gas concentration and reference detector;
Described reference detector by described signal amplification circuit connect described MCU treatment circuit A/D converter in case by the electric signal detected through amplify the backward described MCU treatment circuit of process and export gas concentration reference signal to be measured and make described MCU treatment circuit according to described gas concentration reference signal to be measured and described known gas concentration compare the generation adjusting described modulation signal;
The input end of the corresponding described optical branching device of described laser instrument is arranged, two output terminals corresponding described main road beam shaping mechanisms of difference of described optical branching device and the laser incidence end of described reference beam reshaping device are arranged, and the laser emitting end of described reference beam reshaping device is corresponding in turn to described sealed air chamber, described reference detector is arranged.
3. reflective open circuit laser gas detection system according to claim 1 and 2, is characterized in that: described Space Angle catoptron by multiple be arranged in parallel for the refractive prism of parallel for incident light injection is formed.
4. reflective open circuit laser gas detection system according to claim 1 and 2, it is characterized in that: it also comprises angular adjustment apparatus, described Space Angle catoptron is located on described angular adjustment apparatus.
5. reflective open circuit laser gas detection system according to claim 2, is characterized in that: it also comprises with reference to adjusting gear, and described reference beam reshaping device, described sealed air chamber and described reference detector are located at described with reference on adjusting gear.
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| CN107677639A (en) * | 2017-09-26 | 2018-02-09 | 苏州莱铯科技有限公司 | A kind of method of laser detection formaldehyde gas |
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| CN106323910A (en) * | 2016-10-08 | 2017-01-11 | 安徽中科智泰光电测控科技有限公司 | Urban comprehensive pipe gallery open type multi-component gas on-line monitoring early warning device |
| CN110632008B (en) * | 2019-09-26 | 2022-12-06 | 山东微感光电子有限公司 | Multipoint reflection type photoelectric body sensor probe and photoelectric gas detection device |
| CN110887805A (en) * | 2019-11-20 | 2020-03-17 | 上海化工研究院有限公司 | Regional anomalous gas detection device of multiple spot sight |
| CN116046721B (en) * | 2023-02-17 | 2023-10-24 | 深圳市诺安智能股份有限公司 | Correlation open-circuit laser gas detector and gas detection real-time calibration method |
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Address after: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169 Patentee after: Hanwei Technology Group Limited by Share Ltd Address before: 450001 Zhengzhou high tech Development Zone, Henan, Cedar Road, No. 169 Patentee before: Henan Hanwei Electronics Co., Ltd. |