CN101915747A - Gas concentration measuring device and method thereof - Google Patents
Gas concentration measuring device and method thereof Download PDFInfo
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- CN101915747A CN101915747A CN2010102366230A CN201010236623A CN101915747A CN 101915747 A CN101915747 A CN 101915747A CN 2010102366230 A CN2010102366230 A CN 2010102366230A CN 201010236623 A CN201010236623 A CN 201010236623A CN 101915747 A CN101915747 A CN 101915747A
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Abstract
The invention discloses a gas concentration measuring device and a method thereof, which is applied to measuring the concentration of carbon dioxide; a single-channel infrared gas detecting module is used for detecting a voltage signal of gas to be measured; the voltage signal can be converted into voltage value by a digital to analog convertor; and a processing module is used for correcting the voltage value and reference voltage value for generating the concentration valve of the gas to be measured. If the reference voltage value is initial reference voltage value, the carbon dioxide concentration value in atmospheric environment can be taken as reference data, and the processing module is used for correcting voltage excursion of the gas to be measured. Therefore, the measurement accuracy is improved.
Description
Technical field
The present invention is relevant a kind of gas concentration measuring device and method thereof, particularly measures density of carbon dioxide gas about a kind of Double-channel Virtual infrared ray that utilizes, and the technical field of the variation problem of recoverable when measuring.
Background technology
According to U.S.'s changes in temperature and (the America Society of Heating of air-conditioning man IEEE, Refrigerationand Air Conditioning Engineers, ASHRAE) result of study is pointed out, indoor carbon dioxide concentration surpasses 1,000ppm just should take a breath, and statistics also shows 90% buildings and all is higher than this value.Because human breathing can produce carbon dioxide, in certain confined space, when movable,, will cause brain activity to slow down if human body sucks too much carbon dioxide, slow in reacting, and enter state drowsy, lassitude easily.Therefore, can adopt gas detecting machine usually, so that gas concentration is measured such as the detecting gas concentration lwevel.
Carbon dioxide detector or the capnograph that sells on the market nearly all is that (Non-dispersive Infrared, NDIR) absorption process is come sensing to employing non-dispersive formula infrared ray now.Its principle is the characteristic that the utilization carbon dioxide molecule is directly proportional with uptake to the absorption characteristic and the gas concentration lwevel of infrared ray special wavelength, for example carbon dioxide is the strongest to the ultrared absorbability of 4.26 mum wavelengths, is detected density of carbon dioxide gas.Single channel carbon dioxide sensor in the prior art is a gas sample tube, the one end is an infrared source, the other end is an infrared sensor, carbon dioxide molecule absorbs the 4.26um radiation energy in gas sample tube, by Bill (Beer ' s) law, the corresponding relation of carbon dioxide molecule absorption intensity and concentration can be learnt, the concentration value of the absorption intensity of spectrum can be calculated with measurement gas.Yet, the infrared source intensity of single channel optical sensor is during long period of operation, the magnitude of voltage of infrared source changes and forms the variation situation, sensor problem of aging just, will produce error when therefore measuring gas concentration lwevel and make measure inaccurate.Problem for the correction voltage skew, as United States Patent (USP) the 5th, 347, be for No. 474 the method that discloses a kind of single channel gas sensing device of compensating offset, by determining to make self-correcting method during static, gas concentration lwevel is at 300-500ppm during this, numerical standard by stable state before heterodyne and the deduction is proofreaied and correct, yet the method needs a lot of data and complicated mathematical, so correction time is long and the measurement accuracy can't improve.
In addition, as United States Patent (USP) the 6th, 114, it is single channel optical sensor method for measurement that No. 700 cases disclose a kind of, be non-dispersive infrored equipment and the measuring method thereof of measuring the absorptivity of infrared radiation by gas sample, it is to have different temperature coefficients and to be arranged at the source of parallel light of sample cell one end and to improve ducted temperature, and with the concentration of the NDIR detector monitor carbon dioxide that is arranged at the sample cell other end, and another watch-dog is set to control the light source of continuous output in servo loop, measure concentration of carbon dioxide in optics sensing mode by this.Case is with the non-dispersive infrared ray gas analysis, and through detecting automatically after the conversion of temperature compensation and signal and showing with gas to be measured before this.Only, owing to do not add non-linear revisal circuit, excessive in high concentration and light concentration gas measurement time error, so be only applicable to detect the gas to be measured of specific concentrations.
In order effectively to overcome the problem of long-term variation, the long-term offset method of typical solution is to use the double-channel gas detector, as shown in Figure 1, gas detecting machine comprises a gas sample tube 11, the one end is provided with an infrared source 111, and the other end is provided with two infrared sensors, 112,113, two infrared sensors the 112, the 113rd, is binary channels thermopile detector, two infrared sensors 112,113 are connected to two amplifiers 12,13, and two amplifiers 12,13 are connected in converter 14.Infrared sensor 112 is for measuring passage, the rising temperature in order to the receiving infrared-ray source, measure voltage signal to produce, and be sent to amplifier 12 and will measure and export converter 14 to after voltage signal amplifies, to amplify back measurement voltage signal by converter 14 again and be converted to a measurement magnitude of voltage, another infrared sensor is a reference channel, receiving infrared-ray source and remain on a fixing lower temperature not, to produce a reference voltage signal, and be sent to and export a converter 14 to after amplifier 13 amplifies the reference voltage signal, to amplify back reference voltage signal by converter 14 again and be converted to a reference voltage level, converter 14 is connected in microprocessor 15,15 pairs of microprocessors measure magnitude of voltage and the reference voltage signal is proofreaied and correct, and can accurately measure gas concentration lwevel and correction voltage off-set value.Therefore yet binary channels thermopile detector is complicated vacuum and optical texture, involves great expense and can't generally be applicable to occasions such as general family, office or vast zone.
In view of this, the present invention proposes a kind of gas concentration measuring device and method thereof then, with the aforesaid problem of effective improvement.
Summary of the invention
Fundamental purpose of the present invention is that a kind of gas concentration measuring device and method thereof are being provided, it is to utilize single channel infrared ray measuring structure simple in structure to cooperate the magnitude of voltage of measurement and reference voltage level to proofread and correct the pin-point accuracy that reaches the gas measurement, and then solves the binary channels infrared ray measuring structure and the high problem of manufacturing cost of known complexity.
Another object of the present invention is that a kind of gas concentration measuring device and method thereof are being provided, according to 400ppm gas concentration lwevel suitable in the atmosphere is initial reference magnitude of voltage benchmark, proofread and correct sensor because of the aging problem that produces variation, precision and fiduciary level that gas measures can be improved, and then the correction effect of Double-channel Virtual can be reached.
A further object of the present invention is that a kind of gas concentration measuring device and method thereof are being provided, and is applicable to that house, office build various occasions such as thing, school or commercial location, and can measures the gas with various concentration range, has market competition advantage.
For reaching above-mentioned purpose, gas concentration measuring device of the present invention is applied to measure gas concentration lwevel, and gas concentration measuring device comprises a single channel infrared gas sensing module, is the voltage signal of detecting one gas to be measured; One converter is that voltage signal is converted to a magnitude of voltage; And a processing module, be that a magnitude of voltage and a reference voltage level are proofreaied and correct, to produce the concentration value of gas to be measured.Wherein the to be measured gas of the infrared transmitter of single channel infrared gas sensing module in a gas passage leads to infrared transmitter, make it produce the voltage signal of gas to be measured according to receiving infrared-ray intensity, via amplifier small voltage signal is enlarged into the amplification voltage signal, be sent to digital revolving die and intend converter, amplifying voltage signal is converted to magnitude of voltage and is sent to processing module, processing module is proofreaied and correct according to magnitude of voltage and reference voltage level, to produce the concentration value of gas to be measured.
In addition, another provides the gas concentration method for measurement the present invention, in order to correction voltage skew, sets initial reference voltage level earlier, and reference voltage level is to be reference data according to measure gas concentration in atmosphere; Utilize a single channel infrared gas sensing module one to measure the voltage signal of gas to be measured; Voltage signal is converted to a magnitude of voltage; Magnitude of voltage and reference voltage level are proofreaied and correct, to produce the concentration value of gas to be measured; Can be in regular or irregular renewal reference voltage level at night; And to magnitude of voltage with upgrade after reference voltage level proofread and correct, to produce the concentration value of gas to be measured.
Wherein, described single channel infrared gas sensing module comprises a gas passage, an infrared transmitter and a ultrared sensing device, described infrared transmitter and described ultrared sensing device are arranged at the two ends of described gas passage respectively, described infrared transmitter is the emission infrared ray, lead to described ultrared sensing device through described gas passage, it is complied with receive described infra-red intensity to produce described voltage signal.
Wherein, described single channel infrared gas sensing module more comprises a wave filter, is to allow the described ultrared narrow frequency wavelength of described gas absorption to be measured to pass through, and described ultrared sensing device is to produce described voltage signal according to the narrow frequency Wavelength strength of described incident.
Wherein, the described infrared controller that more comprises is electrically connected at described infrared transmitter, is that the described infrared transmitter of control is launched described infrared ray.
Wherein, described ultrared sensing device is to be a thermoelectric pile ultrared sensing device.
Wherein, described reference voltage level is the measuring value that upgrades for described single channel infrared gas sensing module.
Wherein, described reference voltage level is the measuring value that upgrades night for described single channel infrared gas sensing module.
Wherein, described reference voltage level is the measuring value that upgrades according to environment for described single channel infrared gas sensing module.
Wherein, when described reference voltage is an initial reference magnitude of voltage, be according to gas concentration lwevel value in atmospheric environment as the reference benchmark, and carry out the correction of the variation of described gas to be measured by described processing module.
Wherein, the described concentration value of described gas to be measured is to be the concentration of carbon dioxide value.
Wherein, the described display that more comprises connects described processing module, to show described concentration value.
Wherein, described converter is to be an analog-to-digital converter.
Wherein, the described amplifier that more comprises, an end connect described single channel infrared gas sensing module, and the other end connects described converter, described amplifier is described voltage signal to be enlarged into one amplify voltage signal, and is sent to described converter and is converted to described magnitude of voltage.
Wherein, before measuring the step of gas to be measured, more comprise and set initial described reference voltage level, and described reference voltage level is to be reference data according to measure gas concentration in atmosphere.
Wherein, the described step of upgrading described reference voltage level that more comprises.
Wherein, the described reference voltage level of described renewal is the measuring value that utilizes described single channel infrared gas sensing module to upgrade night.
Wherein, the described reference voltage level of described renewal is the measuring value that utilizes described single channel infrared gas sensing module to upgrade according to environment.
Wherein, the described concentration value of described gas to be measured is to be the concentration of carbon dioxide value.
Beneath by the appended graphic explanation in detail of specific embodiment cooperation, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 is that the double-channel gas concentration of prior art measures schematic representation of apparatus;
Fig. 2 is the synoptic diagram of gas concentration measuring device of the present invention;
Fig. 3 is the flow chart of steps of gas concentration method for measurement of the present invention;
Fig. 4 in buildings, carry out measuring in many days for the present invention before the correction of gas concentration lwevel with proofread and correct after curve map;
Fig. 5 is the magnitude of voltage curve map of gas concentration measuring device of the present invention under different gas concentration lwevels;
Fig. 6 is the gas concentration lwevel error curve diagram of different bearing calibrations.
Description of reference numerals:
The 11-gas sample tube; The 111-infrared source; 112,113-infrared sensor; 12,13-amplifier; The 14-converter; The 15-microprocessor; 21-single channel infrared gas sensing module; The 211-infrared transmitter; The 212-gas passage; 213-ultrared sensing device; The 214-wave filter; The 22-infrared controller; The 23-processing module; The 24-amplifier; The 25-converter; The 216-display; 27-carbon dioxide to be measured.
Embodiment
Hereinafter with reference to correlative type, the gas concentration measuring device according to the embodiment of the invention is described, to be convenient to understand for making, the similar elements among the following embodiment is to illustrate with identical symbology.
See also Fig. 2, it is the synoptic diagram for gas concentration measuring device of the present invention.The principle of utilizing Double-channel Virtual is to carry out the measurement mode of gas concentration lwevel, gas concentration measuring device comprises that a single channel infrared gas sensing module 21 is the voltage signals that measure a carbon dioxide to be measured, and single channel infrared gas sensing module 21 comprises an infrared transmitter 211, a gas passage 212 and a ultrared sensing device 213, and ultrared sensing device 213 is to be thermoelectric pile ultrared sensing device.One infrared controller 22 is that an end is connected in infrared transmitter 211, the other end is connected in a processor 23, when infrared ray controller 22 control infrared transmitter 211 emission infrared rays, infrared ray can lead to ultrared sensing device 213 through the carbon dioxide to be measured in the gas passage 212 27, carbon dioxide molecule wherein to be measured can absorb the specific wavelength infrared ray, makes ultrared sensing device 213 produce the voltage signal of carbon dioxide 27 to be measured according to receiving infrared-ray intensity.In addition, in order to allow the ultrared sensing device 213 can single measurement carbon dioxide 27, single channel infrared gas sensing module 21 can be established a wave filter 214, only allow the ultrared narrow frequency wavelength of carbon dioxide gas bulk absorption to be measured to pass through, make the ultrared sensing device 213 can be according to the narrow frequency Wavelength strength of incident to produce the voltage signal of carbon dioxide 27 to be measured.Infrared transmitter 213 is connected in an amplifier 24, by amplifier 24 small voltage signal is amplified to produce an amplification voltage signal, and be sent to a converter 25, and be to intend converter for digital revolving die, will amplify voltage signal and be converted to a magnitude of voltage and be sent to processing module 23.Processing module 23 is proofreaied and correct according to a magnitude of voltage and a reference voltage level, and bearing calibration such as following operational formula (1):
V
seAcor＝V
seA*(V
seBold/V
seBnew)......................(1)
Wherein, V
SeAcorBe the magnitude of voltage after proofreading and correct, V
SeAFor measuring the magnitude of voltage of carbon dioxide 27 to be measured, V
SeBoldBe reference voltage level, V
SeBnewBe the reference voltage level after upgrading, by this formula (1) variation that is produced between the long-term operating period is proofreaied and correct, and the concentration value of generation carbon dioxide 27 to be measured accurately, again by a display 26 that is connected in processing module 23 with the display density value, by this, the present invention utilizes single channel infrared ray measuring structure simple in structure to reach the pin-point accuracy of the gas measurement of Double-channel Virtual.
Because the concentration of carbon dioxide in ambient atmosphere is about and accounts for 350 parts to 450 parts (ppm in per 1,000,000 parts; Parts per million), and this Atmospheric Carbon Dioxide concentration also is human optimum scope, therefore the present invention is before the step that measures gas to be measured, set initial reference voltage level earlier, and this reference voltage level is according to measure gas concentration in atmosphere be reference data, please cooperate and consult Fig. 3, it is steps flow chart in order to the gas concentration method for measurement of correction voltage skew, if with during daytime when carrying out the measurement of gas to be measured in the buildings, execution in step S31 then, utilize single channel infrared gas sensing module 21 to measure the voltage signal of gas to be measured, owing in the buildings during daytime according to the increase of personnel's quantity and activity make density of carbon dioxide gas with increase, when density of carbon dioxide gas high more, as when 400ppm increases to 1000ppm, the voltage signal of being detected descends thereupon.Execution in step S32 amplifies voltage signal and is converted to a magnitude of voltage, execution in step S33 again, magnitude of voltage and reference voltage level are proofreaied and correct, to produce the concentration value of gas to be measured, repeat to measure and proofread and correct by step S31 to S33, can improve the accuracy that measures gas concentration.Since single channel infrared gas sensing module 21 in long-time use meeting because of the aging problem that variation is arranged, so can be regularly or the renewal reference voltage level that irregularly carries out shown in step S34, the preferably upgrades reference voltage level night.According to personnel's the quantity and the minimizing of activity density of carbon dioxide gas is descended owing in the buildings during night thereupon, when density of carbon dioxide gas descends, as dropping to 400ppm from 1000ppm, even when more being lower than 400ppm, gas concentration lwevel in gas concentration lwevel and the ambient atmosphere is comparatively close at this moment, therefore upgrading reference voltage level can pass through step S31, the measuring value that utilizes single channel infrared gas sensing module 21 to measure night, the direct reference voltage level that uses among the step of replacing S33 can use reference voltage level after the renewal that the magnitude of voltage of skew is proofreaied and correct and be correct magnitude of voltage.As shown in Figure 4, in buildings, carry out measuring in many days for the present invention before the correction of gas concentration lwevel with proofread and correct after curve map, hence one can see that, regular or irregular renewal reference voltage level, effectively correction voltage off-set value in night or varying environment.
For further understanding Double-channel Virtual gas concentration measuring device of the present invention, how it utilizes formula (1) to proofread and correct the variation problem that is produced between the long-term operating period, and reach the precision of binary channels ultrared sensing gas concentration lwevel, see also following form ():
Form (one)
This form (one) is the numerical value that the present invention and prior art are simulated measurement, and wherein, density of carbon dioxide gas sampling value (Symbol) is from 0ppm to 8000ppm, and initial voltage value (V
Se) for 1.6908mV to 1.1490mV be example explanation as after, the gas concentration lwevel of Liang Ceing (CntAA) and not timing at the beginning, prior art has several correcting modes: proofread and correct skew (CntSh) method as single pass gas concentration lwevel, be that the CntAA that will be measured all cuts 103ppm, or utilize single pass gas concentration lwevel slope/ratio to proofread and correct (CntSp) method, be the CntAA that will be measured all divided by 113%, or to utilize binary channels (Cnt2Ch) be that the CntAA that will be measured proofreaies and correct fully and is standard gas concentration lwevel (Cnt0).And bearing calibration of the present invention (CntV2Ch), set a reference voltage level (as the reference voltage level of virtual reference passage) earlier, and proofread and correct with the magnitude of voltage that measures, as being benchmark with the gas concentration lwevel 400ppm in the atmospheric environment, set initial reference voltage level 1.6030mV, when reference voltage level was the initial reference magnitude of voltage, this reference voltage level can be used as V
SeBold, because single channel infrared gas sensing module can produce variation between the long-term operating period, therefore can regular or indefinite magnitude of voltage aspire to measurement period at night gas to be measured, as 1.5870mV, it is in order to replace the initial reference magnitude of voltage, as V
SeBnewIf during in 1000ppm, initial voltage value should be 1.5204mV in the density of carbon dioxide gas that is measured during daytime, but the single channel infrared ray measures the magnitude of voltage (V of gas to be measured
SeAIf) during 1.5052mV, can utilize following formula (1) to carry out computing:
V
seAcor＝1.5052*(1.6030/1.5870)＝1.5204mV
After formula (1) computing, promptly recoverable is 1.5204mV, and identical with initial voltage value, so can produce the concentration value of carbon dioxide to be measured accurately.
As shown in Figure 5, be the magnitude of voltage curve map of gas concentration measuring device of the present invention under different gas concentration lwevels, the wherein standard voltage value (V of gas concentration lwevel
Sez) overlap with the magnitude of voltage curve of gas to be measured after proofreading and correct.Yet the present invention still is subjected to wearing out under the long-term use of single channel infrared gas sensing module, has 0.1% error amount approximately and produce, and that is to say that density of carbon dioxide gas has 0.1% error amount approximately, but bearing calibration of the present invention has been close to perfection.
As shown in Figure 6; it is the gas concentration lwevel error curve diagram of different bearing calibrations; though bearing calibration of the present invention slightly is worse than the precision that prior art uses binary channels ultrared sensing gas concentration lwevel; but can reach the effect that approximate Double passage ultrared sensing gas concentration lwevel measures precision; therefore can solve the binary channels infrared ray measuring structure of prior art complexity and expensive problem; that is to say; the present invention utilizes single channel infrared ray measuring structure simple in structure; and cooperate the correction that measures magnitude of voltage and reference voltage level can effectively overcome long-term voltage bias problem; and can significantly reduce manufacturing cost; relative price is comparatively cheap; be applicable at home; office builds thing; various occasions such as school or commercial location; and can measure the gas with various concentration range, have market competition advantage.Moreover prior art uses single pass gas concentration lwevel to proofread and correct skew (CntSh) bearing calibration; Be that the gas concentration lwevel value that will be measured all cuts 103ppm, another prior art uses single pass gas concentration lwevel slope/ratio (CntSp) bearing calibration; Be the gas concentration lwevel value that will be measured all divided by 113%, long more and gas concentration lwevel is high more for the bearing calibration meeting of these two kinds of prior arts along with operating period, the error amount after proofreading and correct big more so that can't accurately measure gas concentration.Compared to and the use single channel optical sensor of prior art, the present invention can solve prior art in proofreading and correct the back because of can't effectively overcoming variation, and makes the accuracy of measurement gas concentration and the problem of fiduciary level difference.
Above-described embodiment only is for technological thought of the present invention and characteristics are described, its purpose makes the personage who has the knack of this skill can understand content of the present invention and is implementing according to this, when can not with qualification claim of the present invention, promptly the equalization of doing according to disclosed spirit generally changes or modifies, and must be encompassed in the claim of the present invention.
Claims (20)
1. a gas concentration measuring device is characterized in that, comprising:
One single channel infrared gas sensing module is the voltage signal of detecting gas to be measured;
One converter is that described voltage signal is converted to a magnitude of voltage; And
One processing module is that a described magnitude of voltage and a reference voltage level are proofreaied and correct, to produce the concentration value of described gas to be measured.
2. gas concentration measuring device according to claim 1, it is characterized in that, described single channel infrared gas sensing module comprises a gas passage, an infrared transmitter and a ultrared sensing device, described infrared transmitter and described ultrared sensing device are arranged at the two ends of described gas passage respectively, described infrared transmitter emission infrared ray, lead to described ultrared sensing device through described gas passage, it is complied with receive described infra-red intensity to produce described voltage signal.
3. gas concentration measuring device according to claim 2, it is characterized in that, described single channel infrared gas sensing module more comprises a wave filter, be to allow the described ultrared narrow frequency wavelength of described gas absorption to be measured to pass through, described ultrared sensing device is to produce described voltage signal according to the narrow frequency Wavelength strength of described incident.
4. gas concentration measuring device according to claim 2 is characterized in that described device also comprises an infrared controller, and it is electrically connected at described infrared transmitter, is that the described infrared transmitter of control is launched described infrared ray.
5. gas concentration measuring device according to claim 2 is characterized in that, described ultrared sensing device is to be a thermoelectric pile ultrared sensing device.
6. gas concentration measuring device according to claim 1 is characterized in that, described reference voltage level is the measuring value that upgrades for described single channel infrared gas sensing module.
7. gas concentration measuring device according to claim 6 is characterized in that, described reference voltage level is the measuring value that upgrades night for described single channel infrared gas sensing module.
8. gas concentration measuring device according to claim 6 is characterized in that, described reference voltage level is the measuring value that upgrades according to environment for described single channel infrared gas sensing module.
9. gas concentration measuring device according to claim 1, it is characterized in that, when described reference voltage is an initial reference magnitude of voltage, be according to gas concentration lwevel value in atmospheric environment as the reference benchmark, and carry out the correction of the variation of described gas to be measured by described processing module.
10. gas concentration measuring device according to claim 1 is characterized in that, the described concentration value of described gas to be measured is to be the concentration of carbon dioxide value.
11. gas concentration measuring device according to claim 1 is characterized in that, described device more comprises a display, and it connects described processing module, to show described concentration value.
12. gas concentration measuring device according to claim 1 is characterized in that, described converter is to be an analog-to-digital converter.
13. gas concentration measuring device according to claim 1, it is characterized in that, the described amplifier that more comprises, one end connects described single channel infrared gas sensing module, the other end connects described converter, described amplifier is described voltage signal to be enlarged into one amplify voltage signal, and is sent to described converter and is converted to described magnitude of voltage.
14. a gas concentration method for measurement is in order to the correction voltage skew, it is characterized in that described gas concentration method for measurement comprises:
Utilize a single channel infrared gas sensing module to measure the voltage signal of gas to be measured;
Described voltage signal is converted to a magnitude of voltage; And
A described magnitude of voltage and a reference voltage level are proofreaied and correct, to produce the concentration value of described gas to be measured.
15. gas concentration method for measurement according to claim 14, it is characterized in that, before measuring the step of gas to be measured, more comprise and set initial described reference voltage level, and described reference voltage level is to be reference data according to measure gas concentration in atmosphere.
16. gas concentration method for measurement according to claim 14 is characterized in that described method more comprises the step of upgrading described reference voltage level.
17. gas concentration method for measurement according to claim 16 is characterized in that, the described reference voltage level of described renewal is the measuring value that utilizes described single channel infrared gas sensing module to upgrade night.
18. gas concentration method for measurement according to claim 16 is characterized in that, the described reference voltage level of described renewal is the measuring value that utilizes described single channel infrared gas sensing module to upgrade according to environment.
19. gas concentration method for measurement according to claim 14 is characterized in that, the described concentration value of described gas to be measured is to be the concentration of carbon dioxide value.
20. gas concentration method for measurement according to claim 14 is characterized in that, described converter is to be an analog-to-digital converter.
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Cited By (9)
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| CN102175639A (en) * | 2011-01-11 | 2011-09-07 | 叶继伦 | Gas measuring device and method without zero calibration |
| CN103163102A (en) * | 2011-12-09 | 2013-06-19 | 深圳迈瑞生物医疗电子股份有限公司 | Gas measurement method, gas measurement equipment and interference gas compensation device |
| CN103175803A (en) * | 2011-12-26 | 2013-06-26 | 上海仪华仪器有限公司 | Self-correction method for detecting carbon dioxide concentration by adopting non-dispersive infrared technology |
| CN103975231A (en) * | 2011-12-05 | 2014-08-06 | 燃气安全股份有限公司 | Gas sensors |
| CN104777126A (en) * | 2015-02-13 | 2015-07-15 | 中国科学院合肥物质科学研究院 | High-detection-precision sounding apparatus and method for vertical profile of atmospheric CO2 |
| CN106062535A (en) * | 2014-03-13 | 2016-10-26 | 罗伯特·博世有限公司 | Method and device for determining the carbon dioxide content in ambient air |
| CN107036993A (en) * | 2015-11-21 | 2017-08-11 | 帕特里克.王 | Personal carbon dioxide tracker |
| CN112730304A (en) * | 2020-12-18 | 2021-04-30 | 宁波舜宇红外技术有限公司 | Infrared gas alarm and gas concentration detection method |
| CN113008943A (en) * | 2019-12-20 | 2021-06-22 | 财团法人工业技术研究院 | Gas sensing device and gas concentration sensing method |
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| CN102175639A (en) * | 2011-01-11 | 2011-09-07 | 叶继伦 | Gas measuring device and method without zero calibration |
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