CN104458636A - CO2 gas concentration monitoring device and method with automatic temperature and air pressure compensation - Google Patents
CO2 gas concentration monitoring device and method with automatic temperature and air pressure compensation Download PDFInfo
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- CN104458636A CN104458636A CN201410770815.8A CN201410770815A CN104458636A CN 104458636 A CN104458636 A CN 104458636A CN 201410770815 A CN201410770815 A CN 201410770815A CN 104458636 A CN104458636 A CN 104458636A
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Abstract
The invention discloses a CO2 gas concentration monitoring device and method with the automatic temperature and air pressure compensation. The CO2 gas concentration can be accurately detected in a relatively wide temperature range and a relatively wide air pressure range, and the device and the method are applied to monitoring the CO2 gas concentration in a low-temperature low-pressure environment. The CO2 gas concentration is monitored by adopting a dual-wavelength infrared monitoring principle and a suction structure, and the device has the advantages of adaptation to a low-temperature low-pressure environment, high precision, high reliability and the like. The interference caused by factors such as light source instability is eliminated by adopting a dual-channel infrared detector, the absorption length of infrared light is increased by adopting a reflector, the environment suitability of the device is enhanced by adopting a heating element and a heat preservation material, the receiving light intensity is enhanced and the automatic temperature and air pressure compensation and correction is performed by adopting a conical optical collector, and the CO2 gas monitoring precision is effectively improved.
Description
Technical field
The invention belongs to CO
2gas concentration inspect field, is specifically related to adopt dual wavelength infrared monitoring principle and suction-type structure, with temperature compensated pressure auto-compensation, has the high precision CO that digital signal exports
2gas concentration inspect method and device.
Background technology
Certain density CO is there is in surroundings
2gas, but if CO
2gas concentration is too high to threaten to the life security of people, therefore CO in some special occasions is to environment
2the Real-Time Monitoring of gas concentration more and more comes into one's own.
Infrared-gas concentration monitor technology is current CO
2one of focus of gas concentration inspect method, infrared-gas concentration monitor technology possess highly sensitive, precision is high, good stability, have the advantages such as good selectivity, reliability is high, the life-span is long.But, infrared CO common at present
2it is less to there is temperature compensation range in gas concentration inspect technology, and is not with the problems such as pressure compensation, cannot carry out precise monitoring for high altitude localities, makes infrared CO
2gas concentration inspect technology is restricted in the application of high altitude localities.
Summary of the invention
For the deficiencies in the prior art, the invention provides the suction-type CO of a kind of high precision and high reliability
2gas concentration inspect method and device, with heating and thermal insulation measure, temperature and air pressure auto-compensation handling procedure, can be implemented in wider temperature range and air pressure range CO
2the accurate detection of gas concentration, is adapted to the CO of low-temp low-pressure environment
2gas concentration inspect.
The technical solution used in the present invention is: a kind of CO with temperature and air pressure auto-compensation
2gas concentration inspect device, comprises infrared light supply, condenser, pressure transducer, temperature sensor, catoptron, optical collector, binary channels infrared eye, reference optical filter, measures optical filter, air chamber, signal-processing board, heating element, insulation material, air entraining pipe, gas outlet, air intake opening, signal output interface, metal shell, skeleton and mirror unit, the skeleton of inner hollow forms an air chamber, it sets out gas port and air intake opening, air chamber left end is equipped with infrared light supply, before infrared light supply, condenser is set, air chamber right-hand member is equipped with catoptron, catoptron is fixed by mirror unit, be provided with before binary channels infrared eye and measure optical filter and reference optical filter, the front end measuring optical filter and reference optical filter is provided with optical collector, in binary channels infrared eye side, a temperature sensor is set, the temperature of Real-Time Monitoring binary channels infrared eye, between binary channels infrared eye and infrared light supply, air entraining pipe is set, pressure transducer is placed in air entraining pipe, thus acquisition air pressure signal, connect with signal-processing board on the left of binary channels infrared eye and infrared light supply, by the gas concentration obtained, the temperature signal of air pressure and binary channels infrared eye is sent in signal-processing board, then outwards outputed signal by signal transmission interface, be close to the heating element of framework ring around a circle, device is heated, at heating element outer layer covers insulation material, in case heat is lost, whole device is installed metal shell outward and is fixed and protects.
The present invention provides a kind of CO with temperature and air pressure auto-compensation in addition
2gas concentration inspect method, utilizes the above-mentioned CO with temperature and air pressure auto-compensation
2gas concentration inspect device, this CO
2gas concentration inspect method is specifically:
Start heating element, carry out automatic constant-temperature control, gas outlet is connected by vacuum pump, tested gas is impelled to be continued to flow air inlet chamber by air intake opening, in air chamber, infrared light supply sends infrared light, through the focusing of condenser, after collimating effect, gas in directive air chamber, after tested gas absorption, reflected after arriving on catoptron, infrared light to be absorbed by air chamber again, the infrared light that catoptron reflection comes converges by taper optical collector, through measuring optical filter and reference optical filter arrival binary channels infrared eye, binary channels infrared eye two passages produce the signal that a reference signal comprising light source and environmental information and comprise tested gas concentration information respectively, according to the CO of write in advance
2gas concentration calculates model and obtains tested CO
2the concentration of gas.Meanwhile, the air pressure signal obtained by pressure transducer and the temperature signal of binary channels infrared eye obtained by temperature sensor are input to signal-processing board, and signal-processing board is again to CO
2gas concentration carries out temperature, air pressure auto-compensation, thus obtains real CO
2the concentration of gas, by this CO
2gas concentration externally exports.
Wherein, for CO
2the characteristic of gas, adopts multi-point calibration method, sets up CO
2gas concentration calculates model.Timing signal, at CO
2select multiple concentration point in gas concentration inspect range ability, the normal mixture of preparation variable concentrations, the variable C obtaining an air inclusion concentration information according to measuring voltage and reference voltage to eliminate the impact of light source, according to C value and normal concentration
corresponding relation between value sets up CO
2gas concentration calculates model, the temperature of this model and timing signal, pressure information is write in the lump in single-chip microcomputer storer.During actual measurement, signal-processing board receives measuring voltage, reference voltage and temperature, air pressure four numerical value, first calculates CO
2gas concentration information variable C, to get rid of the light source fluctuation and environmental impact that may exist, then according to the CO write in advance
2gas concentration calculates model and calculates corresponding concentration value.Then temperature, atmospheric pressure compensating is carried out according to temperature, air pressure, the CO after being compensated
2gas concentration, this concentration is tested CO
2the actual concentration value of gas.
The advantage of the present invention compared with existing is:
The present invention adopts dual wavelength infrared monitoring principle and suction-type structure to carry out CO
2the concentration monitor of gas, has and is adapted to low-temp low-pressure environment, precision and high reliability.The interference of the factors such as flashing is fixed that adopt binary channels infrared eye to eliminate, adopt catoptron increase infrared light absorption length, adopt heating element and insulation material intensifier environmental suitability, adopt taper optical collector to enhance receiving light power and carry out temperature and air pressure auto-compensation, correction, effectively improve CO
2the precision of gas-monitoring.According to CO
2gas characteristic set up computation model, demarcation and algorithm, ensure that CO
2the accuracy of gas-monitoring.Test result numeral exports, and with temperature and air pressure auto-compensation etc., makes Output rusults more accurate, convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of device of the present invention;
In figure: 1 is infrared light supply; 2 is condenser; 3 is pressure transducer; 4 is temperature sensor; 5 is catoptron; 6 is optical collector; 7 is binary channels infrared eye; 8 is reference optical filter; 9 for measuring optical filter; 10 is air chamber; 11 is signal-processing board; 12 is heating element; 13 is insulation material; 14 is air entraining pipe; 15 is gas outlet; 16 is air intake opening; 17 is signal output interface; 18 is metal shell; 19 is skeleton; 20 is mirror unit;
Fig. 2 is 9 scaling method process flow diagrams;
Fig. 3 is flow chart of data processing figure of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and specific embodiment.
The structure of the present embodiment as shown in Figure 1, the skeleton 19 of inner hollow forms an air chamber 10, it sets out gas port 15 and air intake opening 16, air chamber 10 left end is equipped with infrared light supply 1, condenser 2 is set before infrared light supply 1, air chamber 10 right-hand member is equipped with catoptron 5, catoptron 5 is fixed by mirror unit 20, binary channels infrared eye 7 is provided with above and measures optical filter 9 and reference optical filter 8, the front end measuring optical filter 9 and reference optical filter 8 is provided with taper optical collector 6, in binary channels infrared eye 7 side, a temperature sensor 4 is set, the temperature of Real-Time Monitoring binary channels infrared eye, air entraining pipe 14 is set between binary channels infrared eye 7 and infrared light supply 1, pressure transducer 3 is placed in air entraining pipe 14, thus acquisition air pressure signal, connect with signal-processing board 11 on the left of binary channels infrared eye 7 and infrared light supply 1, by the gas concentration obtained, the temperature signal of pressure and binary channels infrared eye is sent in signal-processing board 11, then outwards outputed signal by signal transmission interface 17, be close to skeleton 19 around a circle heating element 12, device is heated, at heating element 12 outer layer covers insulation material 13, in case heat is lost, whole device is installed metal shell 18 outward and is fixed and protects.
Theoretical according to infrared spectrum, the infrared light of gas with various molecule to its specific wavelength has obvious absorption.According to Lambert-Beer's law: I=I
0exp (-μ CL) wherein I is output intensity, I
0for incident intensity, μ is the absorption coefficient of gas, and C is gas concentration to be measured, and L is the length of transmitted light path; From above formula, when transmitted light path length L and absorption coefficient μ is known, can by measuring I and I
0radiometer calculate the concentration of tested gas.In practical application, because infrared light is easy to by many factors (as temperature, air pressure, mains fluctuations, light source ages etc.) impact, the decay by means of only single light beam transmitted light intensity can not be enough to the concentration of monitor gas.On the basis of Single wavelength infrared monitoring, increase a reference wavelength based on dual wavelength infrared monitoring principle, namely use the electronic circuit that binary channels infrared eye, two optical filter and process dual wavelength signal are corresponding and algorithm realization to the monitoring of gas concentration.An optical filter is for measuring optical filter, monitor the absorption of tested gas to infrared light, the absorbing wavelength of the corresponding monitored gas of its centre wavelength, another is reference optical filter, for monitoring the fluctuation of infrared light supply, its centre wavelength is to all non-absorbent wavelength of all gas.Dual wavelength monitoring method is exactly that obtain through after two optical filters, the change of the infrared absorption energy of respective wavelength, determines existence and the concentration information of tested gas by monitoring.
During device work, start heating element, carry out thermostatic control, gas outlet is connected by vacuum pump, tested gas is impelled to be continued to flow air inlet chamber 10 by air intake opening, in air chamber, infrared light supply 1 sends infrared light, through the focusing of condenser 2, after collimating effect, gas in directive air chamber, after tested gas absorption, reflected after arriving on catoptron 5, infrared light to be absorbed by air chamber again, catoptron 5 is reflected the infrared light come and converges by taper optical collector 6, binary channels infrared eye 7 is arrived through measurement optical filter 9 and reference optical filter 8, binary channels infrared eye 7 two passages produce the signal that a reference signal comprising light source and environmental information and comprise tested gas concentration information respectively, according to the CO of write in advance
2gas concentration calculates model and obtains tested CO
2the concentration of gas.Meanwhile, the air pressure signal obtained by pressure transducer 3 and the temperature signal of binary channels infrared eye 7 obtained by temperature sensor 4 are input to signal-processing board 11, and signal-processing board 11 is again to CO
2gas concentration carries out temperature, self-compensating pressure, thus obtains real CO
2the concentration of gas, by this CO
2gas concentration externally exports.
Data processor is for CO
2the characteristic of gas, adopt the method for multi-point calibration, the present embodiment selects nine calibration points, sets up CO
2gas concentration calculates model, and the flow process of 9 scaling methods is shown in accompanying drawing 2.Timing signal, at CO
2select 9 concentration point in monitoring range ability, preparation normal mixture, after sending into normal mixture, according to measuring voltage V
mwith reference voltage V
refthe variable C obtaining an air inclusion concentration information to eliminate the impact of light source, according to C value and normal concentration
corresponding relation between value sets up CO
2gas concentration calculates model, by this model write single-chip microcomputer storer.During actual monitoring, signal-processing board 11 receives measuring voltage V
m, reference voltage V
ref, air pressure P
mwith temperature T
mfour numerical value, first calculate gas concentration information variable C, to get rid of the light source fluctuation and environmental impact that may exist, then adopt look-up table to calculate corresponding concentration value according to the concentration computation model of write in advance
then according to temperature T
mcalculate temperature compensation coefficient K
1carry out temperature compensation, according to air pressure P
mcalculate atmospheric pressure compensating COEFFICIENT K
2carry out atmospheric pressure compensating, the gas concentration after being compensated
this concentration is tested CO
2the actual concentration value of gas, externally exports this numerical value, and its flow process is shown in accompanying drawing 3.
Non-elaborated part of the present invention belongs to the known technology of those skilled in the art.
Claims (3)
1. one kind has the CO of temperature and air pressure auto-compensation
2gas concentration inspect device, it is characterized in that: comprise infrared light supply (1), condenser (2), pressure transducer (3), temperature sensor (4), catoptron (5), optical collector (6), binary channels infrared eye (7), reference optical filter (8), measure optical filter (9), air chamber (10), signal-processing board (11), heating element (12), insulation material (13), air entraining pipe (14), gas outlet (15), air intake opening (16), signal output interface (17), metal shell (18), skeleton (19) and mirror unit (20), the skeleton (19) of inner hollow forms an air chamber (10), it sets out gas port (15) and air intake opening (16), air chamber (10) left end is equipped with infrared light supply (1), infrared light supply (1) is front arranges condenser (2), air chamber (10) right-hand member is equipped with catoptron (5), catoptron (5) is fixed by mirror unit (20), binary channels infrared eye (7) is provided with above and measures optical filter (9) and reference optical filter (8), the front end measuring optical filter (9) and reference optical filter (8) is provided with taper optical collector (6), a temperature sensor (4) is set in binary channels infrared eye (7) side, the temperature of Real-Time Monitoring binary channels infrared eye (7), air entraining pipe (14) is set between binary channels infrared eye (7) and infrared light supply (1), pressure transducer (3) is placed in air entraining pipe (14), thus obtain gaseous tension value signal, binary channels infrared eye (7) and infrared light supply (1) left side connect with signal-processing board (11), by the gas concentration obtained, air pressure and binary channels infrared eye temperature signal are sent in signal-processing board (11), then outwards outputed signal by signal transmission interface (17), be close to skeleton (19) around circle heating element (12), device is heated, at heating element (12) outer layer covers insulation material (13), in case heat is lost, whole device is installed metal shell (18) outward and is fixed and protects.
2. one kind has the CO of temperature and air pressure auto-compensation
2gas concentration inspect method, utilizes the CO with temperature and air pressure auto-compensation described in claim 1
2gas concentration inspect device, is characterized in that: this CO
2gas concentration inspect method is specifically: start heating element, carry out automatic constant-temperature control, gas outlet is connected by vacuum pump, tested gas is impelled to be continued to flow air inlet chamber (10) by air intake opening, in air chamber, infrared light supply (1) sends infrared light, through the focusing of condenser (2), after collimating effect, gas in directive air chamber, after tested gas absorption, reflected after arrival catoptron (5) is upper, infrared light to be absorbed by air chamber again, the infrared light that catoptron (5) reflection comes converges by taper optical collector (6), through measuring optical filter (9) and reference optical filter (8) arrival binary channels infrared eye (7), binary channels infrared eye (7) two passages produce the signal that a reference signal comprising light source and environmental information and comprise tested gas concentration information respectively, according to the CO of write in advance
2gas concentration calculates model and obtains tested CO
2the concentration of gas, meanwhile, the air pressure signal obtained by pressure transducer (3) and the temperature signal of binary channels infrared eye obtained by temperature sensor (4) are input to signal-processing board (11), and signal-processing board (11) is again to CO
2gas concentration carries out temperature, air pressure auto-compensation, thus obtains real CO
2the concentration of gas, by this CO
2gas concentration externally exports.
3. a kind of CO with temperature and air pressure auto-compensation according to claim 2
2gas concentration inspect method, is characterized in that: for CO
2the characteristic of gas, adopts multi-point calibration method, sets up CO
2gas concentration calculates model; Timing signal, starts heating element, heats, utilize insulation material to make device be in temperature constant state, at CO simultaneously to device
2select multiple concentration point in gas concentration inspect range ability, the normal mixture of preparation variable concentrations, the variable C obtaining an air inclusion concentration information according to measuring voltage and reference voltage to eliminate the impact of light source, according to C value and normal concentration
corresponding relation between value sets up CO
2gas concentration calculates model, writes in single-chip microcomputer storer in the lump by the temperature of this model and timing signal, pressure information; During actual measurement, signal-processing board (11) receives measuring voltage, reference voltage and temperature, air pressure four numerical value, first calculates CO
2gas concentration information variable C, to get rid of the light source fluctuation and environmental impact that may exist, then according to the CO write in advance
2gas concentration calculates model and calculates corresponding concentration value; Then temperature, atmospheric pressure compensating is carried out according to temperature, air pressure, the CO after being compensated
2gas concentration, this concentration is tested CO
2the actual concentration value of gas.
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| CN201410770815.8A CN104458636B (en) | 2014-12-15 | 2014-12-15 | CO2 gas concentration monitoring device and method with automatic temperature and air pressure compensation |
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