CN204832026U - Monitor device of carbon monoxide and methane simultaneously - Google Patents
Monitor device of carbon monoxide and methane simultaneously Download PDFInfo
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- CN204832026U CN204832026U CN201520602381.0U CN201520602381U CN204832026U CN 204832026 U CN204832026 U CN 204832026U CN 201520602381 U CN201520602381 U CN 201520602381U CN 204832026 U CN204832026 U CN 204832026U
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Abstract
The utility model discloses a monitor device of carbon monoxide and methane simultaneously, including laser instrument device, gaseous pond and data acquisition analytical equipment, the laser instrument device includes sine wave generator, sawtooth wave generator, adder, laser control ware, tunable diode laser, collimating lens, first spectroscope and second spectroscope, gaseous pond includes first gaseous absorption cell, the gaseous absorption cell of second and long -range absorption cell, data acquisition analytical equipment includes a photoelectric detector, the 2nd photoelectric detector, the 3rd photoelectric detector, data acquisition card and computer. The utility model discloses an under the environment complicated and changeable carbon monoxide and methane the time, real -time supervision provides low -cost solution method to have that sensitivity height, response speed are fast, stability is good, the reliability is high, the simple advantage of maintenance.
Description
Technical field
The utility model belongs to environmental gas detection field, is specifically related to a kind of device of simultaneously monitoring carbon monoxide and methane concentration.
Background technology
Rock gas is a kind of gaseous state fossil fuel primarily of methane composition, has the advantages such as burning efficiency is high, products of combustion is more clean, becomes one of current important energy source gradually, is used to the every field of producing, living.Along with global energy crisis increasingly sharpens, people have higher requirement to fuel utilization efficiency, and methane, as the main composition of rock gas, carries out its content in burning gases monitoring the burning efficiency that effectively can reflect rock gas.CO is pollutant human body being had to serious harm produced primarily of combustion of fossil fuel, along with people are to the attention gradually of environmental protection, will be stricter to the restriction of CO discharge.CO is also the important indicator of sufficient combustion degree.So to CH
4carry out detection with CO can provide about combustion of natural gas utilization ratio information specifically simultaneously.In addition, CH
4that significance level is only second to CO
2greenhouse gases, CO has very serious harm to human body, can set off an explosion, therefore for CH more than arriving to a certain degree when both aerial content
4in the energy, environment, safety etc., very important meaning is had with the detection of CO.
The gas detection method of current domestic employing is mainly divided into chemical method and optical means.Compared to chemical detection method, the method for optical means particularly spectroscopy has the features such as noncontact, highly sensitive, measurement range is wide, is the main flow direction of current air detection technique development.Tunable diode laser spectral technique (TDLAS) in spectroscopic method uses single-mode laser, has the advantage that spectral line is narrow, can realize high resolving power, high sensitivity and Quick Measurement.But the shortcoming of TDLAS technology is: (1) is realize the high selectivity to object gas, require high to light source single-mode output, centre wavelength can have influence on the accuracy of measurement with the shortcoming that the change of ambient temperature or mechanical property can occur to offset, need when thus applying in rugged surroundings to carry out frequency locking or strict temperature control, which increases the complicacy of system.(2) from industrialization angle, the price of single-mode laser is higher, is unfavorable for the commercialization of system.Above shortcoming all constrains its further widespread use.
Summary of the invention
Goal of the invention: use single mode laser diodes laser instrument cost high for solving in existing spectroscopy gas detection apparatus, and output wavelength is to temperature change sensitive issue, the utility model provide a kind of adopt tunable multi-mode diode lasers while monitoring carbon monoxide and the device of methane concentration.
To achieve these goals, the utility model have employed following technical scheme: a kind of device of simultaneously monitoring carbon monoxide and methane, comprise laser device, gas cell and equipment data acquisition analyzing, described laser device comprises sine-wave generator, saw-toothed wave generator, totalizer, laser controller, tunable diode laser, collimation lens, first spectroscope and the second spectroscope, described gas cell comprises the first gas absorption cell, second gas absorption cell and long-range absorption cell, the methane gas of concentration known is filled with in first gas absorption cell, the CO gas of concentration known is filled with in second gas absorption cell, carbon monoxide to be measured and the mixed gas of methane is filled with in long-range absorption cell, described equipment data acquisition analyzing comprises the first photodetector, second photodetector, 3rd photodetector, data collecting card and computing machine,
Sine-wave generator and saw-toothed wave generator output terminal are all connected totalizer and data collecting card input end, adder output connects laser controller input end, collimation lens is set gradually between the light inlet of laser controller output terminal and long-range absorption cell, first spectroscope, second spectroscope, first dichroic mirror light path sets gradually the first gas absorption cell and the first photodetector, second dichroic mirror light path sets gradually the second gas absorption cell and the second photodetector, the light-emitting window of long-range absorption cell arranges reflective mirror, mirror reflection light path is arranged the 3rd photodetector, first photodetector, second photodetector and the 3rd photodetector output terminal equal connection data capture card input end, data collecting card output terminal connects computer input end.
Further, described first gas absorption cell and the second gas absorption cell include aquarium body, and aquarium body two ends are provided with light inlet window sheet and bright dipping window, and light inlet window sheet and the light through the first spectroscope and the second dichroic mirror are the angle of 88.8 °.
Further, described aquarium body length is 50cm to 80cm.
Further, the mixed gas of methane and nitrogen is filled with in described first gas absorption cell, methane accounts for 3% of mixed gas volume, and be filled with the mixed gas of carbon monoxide and nitrogen in described second gas absorption cell, carbon monoxide accounts for 3% of mixed gas volume.
Further, described long-range absorption cell comprises the cylindrical cavity of Pyrex glass or stainless steel, cylindrical cavity end arranges light inlet and light-emitting window, cylindrical cavity side is provided with bleeding point and air intake opening, air intake opening and bleeding point are equipped with needle-valve, and the position near two ends in cylindrical cavity is respectively equipped with the discrete concave mirror of a slice.
Further, described cylindrical cavity volume is 3.2L, and the distance between the discrete concave mirror of two panels is 55cm, and discrete concave mirror rate is greater than 99%.
The utility model has the advantages that:
1, the utility model is under environment complicated and changeable while carbon monoxide and methane, Real-Time Monitoring provides low cost solution, and have highly sensitive, fast response time, good stability, reliability are high, safeguard simple advantage.
2, replace expensive single-mode laser by simple for technique infrared room temperature is extended wave band multi-mode diode lasers, use the room temperature without the need to cooled with liquid nitrogen to extend wave band InGaAs detector simultaneously, measurement mechanism cost is reduced.Apply tunable multi-mode diode laser spectrum tech to combine with associated light spectral technology, achieve and measure two kinds of gases by separate unit multi-mode diode lasers simultaneously, simplify system, improve measurement efficiency.
When 3, gas being monitored by application multi-mode diode laser correlation spectral wavelength modulation technique, without the need to demarcating accurately the wavelength of diode laser, it is also loose for limiting the drift of centre wavelength, improve the desensitization degree of system to environment, improve stability and the reliability of measurement.The introducing of long-range absorption techniques and wavelength-modulation technique can improve the detection sensitivity of system greatly, and these characteristics not only increase the detection performance of native system, and effectively reduces the measurement cost of system.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is the structural representation of long-range absorption cell.
In figure: 1-sine-wave generator, 2-saw-toothed wave generator, 3-totalizer, 4-laser controller, 5-tunable diode laser, 6-collimation lens, 7-the first spectroscope, 8-the first gas absorption cell, 9-the first photodetector, 10-the second spectroscope, 11-the second gas absorption cell, 12-the second photodetector, 13-long-range absorption cell, 14-reflective mirror, 15-the three photodetector, 16-data collecting card, 17-computing machine, 18-light inlet, 19-light-emitting window, 20-discrete concave mirror one, 21-discrete concave mirror two, 22-air intake opening, 23-bleeding point.
Embodiment:
Below in conjunction with accompanying drawing the utility model done and further explain.
Embodiment one
As illustrated in fig. 1 and 2, device of simultaneously monitoring carbon monoxide and methane of the present utility model comprises laser device, gas cell and equipment data acquisition analyzing.
Described laser device comprises sine-wave generator 1, saw-toothed wave generator 2, totalizer 3, laser controller 4, tunable diode laser 5, collimation lens 6, first spectroscope 7 and the second spectroscope 10.The technical parameter of sinusoidal wave wave producer 1 is: sinusoidal wave frequency is 12KHz, and model can be selected to be the function signal generator of F05; The technical parameter of saw-toothed wave generator 2 is: sawtooth wave frequency is 30Hz, and model can be selected to be the function signal generator of F05; The technical parameter of laser controller 5 is: temperature regulating range is 20-30 DEG C, and step-length is 0.5 DEG C, and precision is 0.005 DEG C, and electric current tuning scope is 20-110mA, and precision is 0.001mA, can select LDC-3724 type controller; The technical parameter of tunable multi-mode diode lasers 4: centre wavelength is positioned at 2.33 μm, peak power output 5mW.
Described gas cell comprises the first gas absorption cell 8, second gas absorption cell 11 and long-range absorption cell 13, described first gas absorption cell 8 and the second gas absorption cell 11 include aquarium body, aquarium body length is 50cm, aquarium body two ends are provided with light inlet window sheet and bright dipping window, light inlet window sheet is the angle of 88.8 ° with the light reflected through the first spectroscope 7 and the second spectroscope 10, to reduce the interference fringe noise that light beam produces on window.The methane gas of concentration known is filled with in first gas absorption cell 8, the CO gas of concentration known is filled with in second gas absorption cell 11, in the present embodiment, the mixed gas of methane and nitrogen is filled with in first gas absorption cell 8, methane accounts for 3% of mixed gas volume, methane concentration can be conversed by volume ratio shared by methane, the mixed gas of carbon monoxide and nitrogen is filled with in second gas absorption cell 11, carbon monoxide accounts for 3% of mixed gas volume, carbonomonoxide concentration can be conversed by volume ratio shared by carbon monoxide, carbon monoxide to be measured and the mixed gas of methane is filled with in long-range absorption cell 13.Described long-range absorption cell 13 comprises the cylindrical cavity of Pyrex glass material, described cylindrical cavity volume is 3.2L, cylindrical cavity end arranges light inlet 18 and light-emitting window 19, cylindrical cavity side is provided with bleeding point 23 and air intake opening 22, air intake opening 22 and bleeding point 23 are equipped with needle-valve, position near two ends in cylindrical cavity is respectively equipped with the discrete concave mirror of a slice, be respectively discrete concave mirror 1 and discrete concave mirror 2 21, distance between the discrete concave mirror of two panels is 55cm, discrete concave mirror rate is greater than 99%, and light beam light path after 182 secondary reflections can reach 100m.
Described equipment data acquisition analyzing comprises the first photodetector 9, second photodetector 12, the 3rd photodetector 15, data collecting card 16 and computing machine 17.The technical parameter of the first photodetector 9, second photodetector 12 and the 3rd photodetector 15 is: response wave band is 1200-1800nm, can select 2011 type InGaAs photodetectors; The technical parameter of data collecting card 16: adopt pci bus, support plug and play, have the D/A output of 12,2 tunnel, 8 tunnels without difference analog input, 1 tunnel 16 digit counter, 16 road programmable switch amounts, Collect conversion can support multiple activation pattern, can adopt AC6115 type data collecting card.
Sine-wave generator 1 and saw-toothed wave generator 2 output terminal are all connected totalizer 3 and data collecting card 16 input end, totalizer 3 output terminal connects laser controller 4 input end, collimation lens 6 is set gradually between the light inlet 18 of laser controller 4 output terminal and long-range absorption cell 13, first spectroscope 7, second spectroscope 10, first spectroscope 7 reflected light path sets gradually the first gas absorption cell 8 and the first photodetector 9, second spectroscope 10 reflected light path sets gradually the second gas absorption cell 11 and the second photodetector 12, the light-emitting window 19 of long-range absorption cell 13 arranges reflective mirror 14, reflective mirror 14 reflected light path is arranged the 3rd photodetector 15.First photodetector 9, second photodetector 12 and the 3rd photodetector 15 output terminal equal connection data capture card 16 input end, data collecting card 16 output terminal connects computing machine 17 input end.
Principle of work: sine-wave generator 1 sends sine wave, saw-toothed wave generator 2 sends sawtooth wave, two paths of signals accesses the two ends of totalizer 3 respectively, totalizer 3 output terminal connects the input end of laser controller 4, the output light of tunable multi-mode diode lasers 5 incides in collimation lens 6, directional light through collimation lens 6 injects the first spectroscope 7 in turn, second spectroscope 10, the light beam the most weak through the intensity of the first spectroscope 7 refraction incides the first gas cell 8, transmitted light is detected by the first photodetector 9, the light beam more weak through the intensity of the second spectroscope 10 refraction incides the second gas cell 11, transmitted light is detected by the second photodetector 12, the light beam that intensity is the strongest incides the 3rd gas cell 13, catoptron 14 in turn, and transmitted light is detected by the 3rd photodetector 15.The utility model uses multi-mode diode laser correlation spectral technique and wavelength modulation spectrum technology, implementation method is loaded in the Injection Current of laser instrument by the sinewave modulation signal of a upper frequency, Laser output is made to make sinusoidal jitter near its optical frequency, to during signal receiving only near modulating frequency second harmonic very the signal of narrow bandwidth extract, realize tuning scope near object gas Absorption Line.Thus inhibit the noise signal of other most of frequency range, substantially increase signal to noise ratio (S/N ratio).Meanwhile, the sawtooth wave of a lower frequency is loaded concurrently in the Injection Current of laser instrument, and the centre wavelength that laser instrument is exported can intactly scanned gaseous absorption line.Three tunnels absorb light signal and are gathered by data card by changing into voltage signal after photodetector, are finally admitted to computing machine 17 and process.Computing machine utilizes and can process data from data collecting card in real time based on the program of LabVIEW software programming, the CH4-CO-N2 mixed gas spectral line of a series of variable concentrations first in testing laser device setting range, therefrom select the spectral line pair that some have the high degree of correlation, and to these spectral lines to Modling model.During measurement, the reference signal recorded and measuring-signal and model are contrasted, the signal high with the model degree of correlation is selected as useful signal, to many group useful signals to the linear regression carrying out carrying out based on least square method to many group available signals, be finally inversed by the concentration of carbon monoxide and methane, and sensitivity and linearity analysis are carried out to measuring process.
The method that the utility model is implemented is carried out according to the following steps: be input in laser controller 4 after the sine wave that sine-wave generator 1 exports by (1) and the sawtooth wave that saw-toothed wave generator 2 exports are coupled by totalizer 3, control tunable multi-mode diode lasers 5, the output of laser controller 4 is loaded on tunable multi-mode diode lasers 5 pairs of wavelength and modulates, and the centre wavelength of tunable multi-mode diode lasers 5 is 2.33 μm ± 2nm; Output wavelength is modulated.(2) through modulation, the output of laser is by obtaining directional light after collimation lens 6, directional light is divided into two bundle directional lights through the first spectroscope 7, is wherein received generation electric signal by after the first gas cell 8 that unknown concentration gas to be measured is housed by the first photodetector 9 through light; Wherein reflected light is divided into two bundles through the second spectroscope 10 again, and the light beam of two intrafascicular reflections is received generation electric signal by behind the second reference gas pond 11 that concentration known CO gas is housed by the second photodetector 12; After two intrafascicular transmitted lights are reflected by catoptron 16, reflected by reflective mirror 14 by after the 3rd gas cell 13 that the mixed gas of methane to be measured and carbon monoxide is housed, then generation electric signal is received by the 3rd photodetector 15, the electric signal that first photodetector 9, second photodetector 12 and the 3rd photodetector 15 produce is gathered by data collecting card 16, is input to computing machine 17 carries out Treatment Analysis by pci interface.
Embodiment two
The difference of the present embodiment and embodiment one is: the cylindrical cavity of described long-range absorption cell 13 is stainless steel.
Embodiment three
The difference of the present embodiment and embodiment one is: the aquarium body length 80cm of described first gas absorption cell 8 and the second gas absorption cell 11.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (6)
1. monitor a device for carbon monoxide and methane simultaneously, comprise laser device, gas cell and equipment data acquisition analyzing, is characterized in that: described laser device comprises sine-wave generator (1), saw-toothed wave generator (2), totalizer (3), laser controller (4), tunable diode laser (5), collimation lens (6), first spectroscope (7) and the second spectroscope (10), described gas cell comprises the first gas absorption cell (8), second gas absorption cell (11) and long-range absorption cell (13), the methane gas of concentration known is filled with in first gas absorption cell (8), the CO gas of concentration known is filled with in second gas absorption cell (11), be filled with carbon monoxide to be measured and the mixed gas of methane in long-range absorption cell (13), described equipment data acquisition analyzing comprises the first photodetector (9), second photodetector (12), 3rd photodetector (15), data collecting card (16) and computing machine (17),
Sine-wave generator (1) and saw-toothed wave generator (2) output terminal are all connected totalizer (3) and data collecting card (16) input end, totalizer (3) output terminal connects laser controller (4) input end, collimation lens (6) is set gradually between the light inlet (18) of laser controller (4) output terminal and long-range absorption cell (13), first spectroscope (7), second spectroscope (10), first spectroscope (7) reflected light path sets gradually the first gas absorption cell (8) and the first photodetector (9), second spectroscope (10) reflected light path sets gradually the second gas absorption cell (11) and the second photodetector (12), the light-emitting window (19) of long-range absorption cell (13) arranges reflective mirror (14), reflective mirror (14) reflected light path is arranged the 3rd photodetector (15), first photodetector (9), second photodetector (12) and the 3rd photodetector (15) output terminal equal connection data capture card (16) input end, data collecting card (16) output terminal connects computing machine (17) input end.
2. a kind of device of simultaneously monitoring carbon monoxide and methane according to claim 1, it is characterized in that: described first gas absorption cell (8) and the second gas absorption cell (11) include aquarium body, aquarium body two ends are provided with light inlet window sheet and bright dipping window, and light inlet window sheet and the light reflected through the first spectroscope (7) and the second spectroscope (10) are the angle of 88.8 °.
3. a kind of device of simultaneously monitoring carbon monoxide and methane according to claim 2, is characterized in that: described aquarium body length is 50cm to 80cm.
4. a kind of device of simultaneously monitoring carbon monoxide and methane according to claim 1, it is characterized in that: the mixed gas being filled with methane and nitrogen in described first gas absorption cell (8), methane accounts for 3% of mixed gas volume, be filled with the mixed gas of carbon monoxide and nitrogen in described second gas absorption cell (11), carbon monoxide accounts for 3% of mixed gas volume.
5. a kind of device of simultaneously monitoring carbon monoxide and methane according to claim 1, it is characterized in that: described long-range absorption cell (13) comprises the cylindrical cavity of Pyrex glass or stainless steel, cylindrical cavity end arranges light inlet (18) and light-emitting window (19), cylindrical cavity side is provided with bleeding point (23) and air intake opening (22), air intake opening (22) and bleeding point (23) are equipped with needle-valve, and the position near two ends in cylindrical cavity is respectively equipped with the discrete concave mirror of a slice.
6. a kind of device of simultaneously monitoring carbon monoxide and methane according to claim 5, it is characterized in that: described cylindrical cavity volume is 3.2L, the distance between the discrete concave mirror of two panels is 55cm, and discrete concave mirror rate is greater than 99%.
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| CN201520602381.0U CN204832026U (en) | 2015-08-11 | 2015-08-11 | Monitor device of carbon monoxide and methane simultaneously |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021569A (en) * | 2015-08-11 | 2015-11-04 | 江苏师范大学 | Device for simultaneously monitoring carbon monoxide and methane |
| CN108287147A (en) * | 2018-04-27 | 2018-07-17 | 贵州电网有限责任公司 | A kind of device and detection method of detection sulfur hexafluoride gas decomposition product |
-
2015
- 2015-08-11 CN CN201520602381.0U patent/CN204832026U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021569A (en) * | 2015-08-11 | 2015-11-04 | 江苏师范大学 | Device for simultaneously monitoring carbon monoxide and methane |
| CN108287147A (en) * | 2018-04-27 | 2018-07-17 | 贵州电网有限责任公司 | A kind of device and detection method of detection sulfur hexafluoride gas decomposition product |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xuzhou Haoyun Information Technology Co., Ltd. Assignor: Jiangsu Normal University Contract record no.: X2019320000004 Denomination of utility model: Device for simultaneously monitoring carbon monoxide and methane Granted publication date: 20151202 License type: Common License Record date: 20190806 |
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| EE01 | Entry into force of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Xuzhou Haoyun Information Technology Co.,Ltd. Assignor: Jiangsu Normal University Contract record no.: X2019320000004 Date of cancellation: 20201224 |
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Granted publication date: 20151202 Termination date: 20200811 |
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| CF01 | Termination of patent right due to non-payment of annual fee |