CN103454242A - Gas concentration measuring method and system thereof - Google Patents
Gas concentration measuring method and system thereof Download PDFInfo
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- CN103454242A CN103454242A CN2013104499739A CN201310449973A CN103454242A CN 103454242 A CN103454242 A CN 103454242A CN 2013104499739 A CN2013104499739 A CN 2013104499739A CN 201310449973 A CN201310449973 A CN 201310449973A CN 103454242 A CN103454242 A CN 103454242A
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Abstract
A gas concentration measuring method includes the steps of collecting a background gas and measuring a spectral line of the obtained background gas, collecting a to-be-measured gas in a measuring area, mixing the collected to-be-measured gas with the background gas, measuring the mixed gas and calculating a spectral line of the to-be-measured gas according to the spectral line of the background gas, and analyzing the spectral line of the to-be-measured gas and calculating the concentration of the to-be-measured gas through a peak value gas converting algorithm. According to the gas concentration measuring method, according to the principle that gas absorbs light, spectrum of the to-be-measured gas can be obtained from measuring of the mixed gas according to the spectral line of the background gas, and through analysis of the spectrum and the mode of peak value converting, concentration of each trace gas can be accurately and quickly calculated. Besides, the invention further provides a gas concentration measuring system.
Description
Technical field
The present invention relates to the gas concentration analytical technology, relate in particular to a kind of gas concentration measuring method and system thereof.
Background technology
In recent years; a lot of analytical equipments to gases such as the oxygen in building construction office, carbon dioxide have appearred in reality; but for micro-gas; the analysis of gases such as CO, CH4, C2H4, C2H2, C2H6, H2 and device thereof are but seldom; yet; when in environment, these minimum gas reach finite concentration; human body is harmful to; also likely cause the phenomenon of device interior spontaneous combustion; so, to the monitoring of these minimum gas, physical and mental health and the environmental protection of human body are played to very large effect.
Publication number in the Chinese invention patent application prospectus " CN101776593A " name is called " active gas detection method and warning device thereof " and discloses a kind of active gas detection method, it is included in tested zone infrared receiver and infrared generator is set in pairs, the infrared transmitting device that should arrange in pairs and infrared receiver are surveyed the situation of infrared signal absorbed wavelength in air, measure the concentration of the corresponding measured target gas of this wavelength by analyzing this power that is absorbed wavelength.Yet the detection method of this minimum gas need to be used a plurality of infrared sensors, and, to minimum gas concentration analysis overlong time, precision is lower.
Summary of the invention
In view of this, a kind of gas concentration measuring method need be provided, the concentration value of the minimum gas in zone can be detected fast and accurately.
Goal of the invention of the present invention is achieved through the following technical solutions:
A kind of gas concentration measuring method comprises: gather background gas, and measure the spectrum line that obtains described background gas; Gather the gas to be measured in measured zone; The gas to be measured collected is mixed with background gas; Mixed mixed gas is measured, and calculated the spectrum line of gas to be measured according to the spectrum line of background gas; Analyze the spectrum line of gas to be measured, and calculate the concentration of gas to be measured according to peak height value gas transfer algorithm.
Above-mentioned gas concentration measuring method, wherein: the spectrum line of described analysis gas to be measured, and specifically comprise according to the step that peak height value gas transfer algorithm calculates the concentration of gas to be measured: the spectrum line of gas to be measured is converted to corresponding wave number; Search mxm. in rear each gas wave-number range of conversion; Search the average straight-line equation according to the spectrum line of gas to be measured and the wave number value after conversion, calculate the peak height value of gas to be measured by the mxm. of searching; The peak height value of gas to be measured is converted to concentration.
Above-mentioned gas concentration measuring method, wherein: the wave number value after the described spectrum line according to gas to be measured and conversion is searched the average straight-line equation, the step of calculating the peak height value of gas to be measured specifically comprises: according to the spectrum line of gas to be measured and the wave number value after conversion, find the point coordinates of the most close baseline starting point and terminal by the circulation array, obtain the average straight-line equation; The corresponding described average straight-line equation of wave number substitution the mxm. found, obtain intersection point numerical value; Deduct by mxm. the peak height value that the number of hits value obtains gas to be measured.
Above-mentioned gas concentration measuring method, wherein: the change type that the described value of the peak height by gas to be measured is converted to concentration is as follows: gas concentration value=the first gas concentration coefficient * peak height value * peak height value+second gas concentration coefficient * peak height value; Wherein, the first gas concentration coefficient, the second gas concentration coefficient are empirical value.
Above-mentioned gas concentration measuring method, wherein: the spectrum line that the described spectrum line according to background gas calculates gas to be measured is the blending ratio a:b according to gas to be measured and background gas, calculates the spectrum line of gas to be measured by following change type: the spectrum line of the spectrum line * (a+b) of the spectrum line=mixed gas of gas to be measured/a – background gas.
In addition, the present invention also provides a kind of gas concentration measurement system, simple in structure, with low cost, can measure fast and accurately the concentration of each minimum gas.
A kind of gas concentration measurement system, comprise infrared light propagated sensation sensor, gas switching device shifter, and controller.Wherein, infrared light propagated sensation sensor, for calculating the spectrum line of gas by the infrared radiation aerometer.The gas switching device shifter, for gathering the gas to be measured in background gas and measured zone, and the gas to be measured collected is mixed with background gas, it comprises the outer circulation pipeline that holds gas to be measured, the internal recycle pipeline that holds background gas, be arranged between described outer circulation pipeline and internal recycle pipeline, for controlling the by-pass valve control of described outer circulation pipeline and internal recycle pipeline conducting or cut-off, and be arranged on the air chamber be connected on described internal recycle pipeline, with described infrared light propagated sensation sensor.Controller is connected with described infrared light propagated sensation sensor, calculates the spectrum line of gas for analyzing described infrared light propagated sensation sensor, calculates the concentration of gas to be measured by peak height value gas transfer algorithm.
Above-mentioned gas concentration measurement system, wherein: described controller comprises the wave number modular converter, value is searched module, spectrum peak height value computing module, and gas concentration modular converter.Wherein, the wave number modular converter is for being converted to corresponding wave number by the spectrum line of gas to be measured.Value is searched module for searching after conversion mxm. in each gas wave-number range.Spectrum peak height value computing module is used for searching the average straight-line equation according to the wave number value after the spectrum line of gas to be measured and conversion, calculates the peak height value of gas to be measured by the mxm. of searching.The gas concentration modular converter is for being converted to concentration by the peak height value of gas to be measured.。
Above-mentioned gas concentration measurement system, wherein: described gas switching device shifter also comprises the gas access to be measured that is arranged on described outer circulation pipeline place, be arranged on first air intake valve at place, described gas access to be measured, be arranged on the air admission hole that described inner circulating tube is said, be arranged on the second air intake valve of described air admission hole, drain tap, and carry out mixed uniformly even air pump for gas to be measured and the background gas in described internal recycle pipeline in the outer circulation pipeline sealing.
Above-mentioned gas concentration measurement system, wherein: this measuring system also comprises with described gas switching device shifter and being connected, for gas to be measured being pushed to the air inlet pusher of described gas switching device shifter.
Above-mentioned gas concentration measurement system, wherein: described air inlet pusher comprises at least two passes, for the propelling air pump interior to the outer circulation pipeline gas propulsive to be measured, and be arranged between described passage and propelling air pump, for the change-over switch of switching channel.
Compared with prior art, gas concentration measuring method of the present invention, utilize the principle of absorption of gas to light, draw the spectrum of gas to be measured according to the spectrum line of background gas from the measurement of mixed gas, by the mode of the analysis to this spectrum and the conversion of peak height value, calculate fast and accurately the concentration of each minimum gas.
Gas concentration measurement system of the present invention, the gas collected by infrared light propagated sensation sensor irradiation gas switching device shifter obtains corresponding spectrum, by the analysis to spectrum and peak height value gas transfer algorithm, measure fast and accurately the concentration of each minimum gas, whole simple in measurement system structure, with low cost, easy operating.
The accompanying drawing explanation
The process flow diagram that Fig. 1 is embodiment of the present invention gas concentration measuring method;
The refinement process flow diagram that Fig. 2 is step S105 in embodiment of the present invention Fig. 1;
The refinement process flow diagram that Fig. 3 is step S1053 in embodiment of the present invention Fig. 2;
The structural representation that Fig. 4 is embodiment of the present invention gas switching device shifter;
The structural representation that Fig. 5 is the invention process csr controller;
The structural representation that Fig. 6 is embodiment of the present invention air inlet pusher;
Structural representation when Fig. 7 is the work of embodiment of the present invention gas switching device shifter.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being realized purpose and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
Figure 1 shows that the process flow diagram of embodiment of the present invention gas concentration measuring method.
Step S101, gather background gas, and measure the spectrum line that obtains this background gas.
Because the spectrum line of background gas is the reference value as the spectrum line of subsequent calculations gas to be measured, therefore, the quality that background gas is measured will be directly connected to the measuring accuracy of follow-up gas to be measured.In embodiment of the present invention, background gas, gas relatively good from greening usually changes in little space, is generally to gather outdoor certain gas near the point of greenbelt gas as a setting.
Because various gas can be to the characteristic of certain section light wavelength absorption, optical sensor utilizes gas these characteristics of principle of absorption to light, the gaseous sample that will analyze is carried out to ultrared irradiation, and the light of returning through the irradiation back reflection carries out spectral analysis, just can obtain specific gas peak height value.Therefore, embodiment of the present invention is at first to pass through the infrared radiation background gas of the infrared light propagated sensation sensor in the gas concentration measurement system, draws the spectrum line of background gas.
Step S102, gather the gas to be measured in measured zone.In embodiment of the present invention, gas concentration measuring method is testing needle to a kind of gas concentration test of gas, for two or more the concentration determination of multiple gases stack not in limit of consideration.In other embodiment of the present invention, step S102 also can carry out before step S101, repeated no more herein.
Step S103, mixed the gas to be measured collected with background gas.In embodiment of the present invention, be that the gas to be measured will collected evenly mixes in default ratio with background gas.For convenience of calculation, normally the gas to be measured collected is mixed in the ratio of 1:1 with background gas.
Step S104, measured mixed mixed gas, and calculate the spectrum line of gas to be measured according to the spectrum line of background gas.In order to improve measuring accuracy, mixed gas need be waited for for a moment usually, just make when mixed gas is relatively static to get off to be measured.In embodiment of the present invention, the spectrum line that calculates gas to be measured according to the spectrum line of background gas is the blending ratio a:b according to gas to be measured and background gas, calculates the spectrum line of gas to be measured by following change type:
The spectrum line of the spectrum line * (a+b) of the spectrum line=mixed gas of gas to be measured/a – background gas.
When the blending ratio of gas to be measured and background gas is 1:1, the spectrum line of the spectrum line * 2 – background gas of the spectrum line=mixed gas of gas to be measured.
In other embodiment of the present invention, can also take multiple measurements mixed gas, obtain many groups measured value of mixed gas, by getting the modes of organizing the mean value of measured values, improve measuring accuracy more.
Step S105, analyze the spectrum line of gas to be measured, and calculate the concentration of gas to be measured according to peak height value gas transfer algorithm.
Therefore, gas concentration measuring method of the present invention, utilize the principle of absorption of gas to light, at first measure the spectrum line of background gas, then mixed gas is carried out to the spectrum line measurement, thereby obtain the spectrum line of gas to be measured, finally by the spectrum to gas to be measured, analyzed, and, by peak height value gas transfer algorithm, calculated fast and accurately the concentration of each minimum gas, be a kind of flexibly, the analysis method for gases of environmental protection, provide favourable guarantee to the concentration measurement and control of minimum gas.
Figure 2 shows that the refinement process flow diagram of step S105 in embodiment of the present invention Fig. 1.
Step S1051, be converted to corresponding wave number by the spectrum line of gas to be measured.
Because the spectrum line of the gas to be measured calculated is the great spectrum line of data volume, belong to the array of one dimension, we need to wave number corresponding to this one-dimensional data convert to, and conversion formula is as follows:
RWave[i]=K*i+b;
K=(ToRange–FromRange)/(RPoint-1);
b=FromRange;
Wherein: the starting point that FromRange is spectrum line is empirical value (the empirical value here is the factory-said value of infrared sensor infrared probe); The terminal that ToRange is spectrum line is empirical value (the empirical value here is the factory-said value of infrared sensor infrared probe); The number that RPoint is the spectrum line array (can obtain from the array that infrared light propagated sensation sensor reads); RWave is corresponding wave number array, the array index that the i here is corresponding with RPoint.
Step S1052, search mxm. in rear each gas wave-number range of conversion.
Usually, each gas has corresponding wave-number range on spectrum line, below to take carbon monoxide (CO) be example, its wave-number range as: COPeakStart is carbon monoxide wave-number range starting point, is empirical value (the empirical value here is the result drawn by doing experiment); The terminal that COPeakEnd is the carbon monoxide wave-number range is empirical value (the empirical value here is the result drawn by doing experiment).We can find out mxm. COMaxData and corresponding coordinate point value COMaxPos according to this scope by loop statement (loop statement herein refers within the specific limits, and data are carried out to bubbling algorithm, maximizing).
Step S1053, search the average straight-line equation according to the spectrum line of gas to be measured and the wave number value after conversion, calculates the peak height value of gas to be measured by the mxm. of searching.Consult Fig. 3, this step specifically comprises:
Step S10531, according to the spectrum line of gas to be measured and the wave number value after conversion, find the point coordinates of the most close baseline starting point and terminal by the circulation array, obtain the average straight-line equation.
Usually, each gas has a gas baseline on spectrum, and the gas baseline comprises starting point and terminal, as: the starting point that CO BaseStart is the CO gas baseline is empirical value (the empirical value here is the result drawn by doing experiment); The terminal that CO BaseEnd is the CO gas baseline is empirical value (the empirical value here is the result drawn by doing experiment).In embodiment of the present invention, according to the spectrum line of the gas to be measured obtained before and the wave number value after conversion, find the point coordinates of the most close baseline starting point and terminal by the circulation array: the carbon monoxide baseline starting point coordinate values that COX1, COY1 are the most close baseline starting point empirical value, the carbon monoxide baseline terminal coordinate values that COX2, COY2 are the most close baseline terminal empirical value.Because the average straight-line equation is a linear equation in two unknowns, therefore, the coordinate figure equation calculating by starting point and terminal, can obtain this binary average straight-line equation once.
Step S10532, corresponding this average straight-line equation of wave number substitution the mxm. found, obtain intersection point numerical value.Take carbon monoxide as example:
COYMax=((COY2 – COY1) * COMaxPos+ (COY1*COX1 – COY2*COX2))/(COX2-COX1); Wherein, the intersection point numerical value that COYMax is carbon monoxide, be the straight line that forms of wave number that mxm. and mxm. are corresponding and the crossing point value of the straight line in straight-line equation.
Step S10533, deduct by mxm. the peak height value that the number of hits value obtains gas to be measured.That is, COHeight=COMaxData – COYMax.Wherein, the peak height value that COHeight is carbon monoxide.
Step S1054, be converted to concentration by the peak height value of gas to be measured.In embodiment of the present invention, it is as follows that the peak height value of gas to be measured is converted to the change type of concentration:
Gas concentration value=the first gas concentration coefficient * peak height value * peak height value+second gas concentration coefficient * peak height value; Wherein, the first gas concentration coefficient, the second gas concentration coefficient are empirical value.
Take carbon monoxide as example, the gas concentration value COGas=COP1*COHeight*COHeight+COP2*COHeight of carbon monoxide;
Wherein: COP1: being carbon monoxide gas concentration coefficient 1, is empirical value; COP2: being carbon monoxide gas concentration coefficient 2, is empirical value; COHeight: be the peak height value of carbon monoxide.
Gas concentration measurement system of the present invention comprises that infrared light propagated sensation sensor, gas switching device shifter 10(are as shown in Figure 4) and the controller (not shown).
In embodiment of the present invention, infrared light propagated sensation sensor comprises test air chamber, infrared probe and spectrum computing module.Mainly realize the calculating of the gaseous spectrum in air chamber.That is, by the infrared radiation aerometer, calculate the spectrum line of gas.
Gas switching device shifter 10 is for gathering the gas to be measured in background gas and measured zone, and the gas to be measured collected is mixed with gas.It comprises the outer circulation pipeline 101 that holds gas to be measured, the internal recycle pipeline 102 that holds background gas, be arranged between outer circulation pipeline and internal recycle pipeline, for controlling the by-pass valve control 103 of outer circulation pipeline 101 and internal recycle pipeline 102 conductings or cut-off, and be arranged on the air chamber 104 be connected on internal recycle pipeline 102, with infrared light propagated sensation sensor.Wherein, background gas is cleaner air, generally uses the outdoor air near the greenbelt place.In the specific embodiment of the invention, the volume ratio of the gas that gas switching device shifter 10 China and foreign countries' circulating lines 101 and internal recycle pipeline 102 hold is 1:1.
In addition, gas switching device shifter 10 also comprises the gas access to be measured 105 that is arranged on outer circulation pipeline place, be arranged on first air intake valve 106 at place, gas access to be measured, be arranged on the air admission hole 107 that inner circulating tube is said, be arranged on the second air intake valve 108 of air admission hole, drain tap 109, and carry out mixed uniformly even air pump 110 for the gas to be measured in the outer circulation pipeline 101 sealing and the background gas in internal recycle pipeline 102.Wherein, can also arrange on air admission hole 107 and advance the air pump (not shown), repeat no more herein.
Controller is connected with infrared light propagated sensation sensor, calculates the spectrum line of gas for analyzing infrared light propagated sensation sensor, calculates the concentration of gas to be measured by peak height value gas transfer algorithm.In embodiment of the present invention, controller can be built in gas switching device shifter 10, and certainly, it also can separate setting with gas switching device shifter 10.When controller, with gas switching device shifter 10, separate while arranging, it can be smart mobile phone, computing machine, personal digital assistant (Personal Digital Assistant, PDA) etc.
Therefore, gas concentration measurement system of the present invention, the gas collected by infrared light propagated sensation sensor irradiation gas switching device shifter obtains corresponding spectrum, by the analysis to spectrum and peak height value gas transfer algorithm, measure fast and accurately the concentration of each minimum gas, whole simple in measurement system structure, with low cost, easy operating.
Consulting Fig. 5, is the structural representation of the invention process csr controller 20.Controller 20 comprises wave number modular converter 201, value is searched module 202, spectrum peak height value computing module 203 and gas concentration modular converter 204.
Wave number modular converter 201 is converted to corresponding wave number for the spectrum line by gas to be measured.Because the spectrum line of the gas to be measured calculated is the great spectrum line of data volume, belong to the array of one dimension, we need to wave number corresponding to this one-dimensional data convert to, and conversion formula is as follows:
RWave[i]=K*i+b;
K=(ToRange–FromRange)/(RPoint-1);
b=FromRange;
Wherein, the starting point that FromRange is spectrum line is empirical value (the empirical value here is the factory-said value of infrared sensor infrared probe); The terminal that ToRange is spectrum line is empirical value (the empirical value here is the factory-said value of infrared sensor infrared probe); The number that RPoint is the spectrum line array (can obtain from the array that infrared light propagated sensation sensor reads); RWave is corresponding wave number array, the array index that the i here is corresponding with RPoint.
Value is searched module 202 for searching after conversion mxm. in each gas wave-number range.Usually, each gas has corresponding wave-number range on spectrum line, below to take carbon monoxide (CO) be example, its wave-number range as: COPeakStart is carbon monoxide wave-number range starting point, is empirical value (the empirical value here is the result drawn by doing experiment); The terminal that COPeakEnd is the carbon monoxide wave-number range is empirical value (the empirical value here is the result drawn by doing experiment).We can find out mxm. COMaxData and corresponding coordinate point value COMaxPos according to this scope by loop statement (loop statement herein refers within the specific limits, and data are carried out to bubbling algorithm, maximizing).
Spectrum peak height value computing module 203 for the spectrum line according to gas to be measured and the conversion after the wave number value search the average straight-line equation, calculate the peak height value of gas to be measured by the mxm. of searching.In embodiment of the present invention, spectrum peak height value computing module 203 comprises average straight-line equation computing unit 2031, intersection point numerical calculation unit 2032 and peak height value computing unit 2033.Wherein, the wave number value of average straight-line equation computing unit 2031 after for the spectrum line according to gas to be measured and conversion, find the point coordinates of the most close baseline starting point and terminal by the circulation array, obtain the average straight-line equation.Usually, each gas has a gas baseline on spectrum, and the gas baseline comprises starting point and terminal, because the average straight-line equation is a linear equation in two unknowns, therefore, the coordinate figure equation calculating by starting point and terminal, can obtain this binary average straight-line equation once.Intersection point numerical calculation unit 2032, for this average straight-line equation of wave number substitution corresponding to mxm. finding, obtains intersection point numerical value.Peak height value computing unit 2033 obtains the peak height value of gas to be measured for deduct the number of hits value by mxm..
Gas concentration modular converter 204 is converted to concentration for the peak height value by gas to be measured.Herein, it is as follows that the peak height value is converted to the change type of concentration:
Gas concentration value=the first gas concentration coefficient * peak height value * peak height value+second gas concentration coefficient * peak height value; Wherein, the first gas concentration coefficient, the second gas concentration coefficient are empirical value.
In addition, this gas concentration measurement system also comprise with the gas switching device shifter be connected, for gas to be measured being pushed to the air inlet pusher of gas switching device shifter.In embodiment of the present invention, the air inlet pusher is to be connected with the gas access to be measured 105 of gas switching device shifter 10.
Figure 6 shows that the structural representation of air inlet pusher 30, it comprises at least two passes 301, for the propelling air pump 302 interior to the outer circulation pipeline gas propulsive to be measured, and be arranged between passage and propelling air pump, for the change-over switch (not shown) of switching channel.Adopt at least two passes 301, can realize the gas sample collection to the different distributions regional air.In embodiment of the present invention, every passage 301 inside are provided with the valve (not shown), control by each channel valve and propelling air pump 302, can realize that the control of multiplexer channel gas pushes, certainly, in the propelling movement process, need guarantee the function that 30 each time period of air inlet pusher only have a road gas pushing, therefore, air inlet pusher 30 and gas switching device shifter 20 just can be combined to form the multipath gas cyclic switching.
In addition, the quantity of air inlet pusher 30 can be also two or more, and the outlet of air inlet pusher can connect a certain feeder connection of another air inlet pusher, thereby realizes the acquisition function of Distributed Area gas.
The principle of work of gas switching device shifter 10 is as follows:
At first close even air pump 110 and by-pass valve control 103, internal recycle pipeline 102 and outer circulation pipeline 101 are disconnected.That is, internal recycle pipeline 102 can't conducting with outer circulation pipeline 101.
Then purify the interior gas of internal recycle pipeline 102, the Resurvey background gas.Operation is to open the second air intake valve 108 and drain tap 109 in detail, start and be connected to the propelling air pump (not shown) on air admission hole 107, extraneous background gas is advanced to internal recycle pipeline 102, according to rapid flow shown in 102 gas flows of Fig. 4 internal recycle pipeline, before the gas that carries over through the drain tap 109 of opening, emit, at this moment air chamber will stored cleaner gas, reaches air chamber 104 Air purifications.
After air chamber 104 purifies, by closing the second air intake valve 108 and drain tap 109 sealing internal recycle pipelines 102.Background gas in internal recycle pipeline 102 is relatively static while getting off, and is arranged on the infrared probe of air chamber 104 the insides, can start air chamber 101 the inside background gas are carried out to infrared ray repeatedly to irradiate, and draws the stable measured value of background gas (spectrum line).
Afterwards, gather gas to be tested.Open the first air intake valve 106, outer circulation pipeline 101 is connected with outside gas to be tested, if now start the propelling air pump of air inlet pusher, outer circulation pipeline 101 will be full of rapidly gas to be tested, and the interior gas flow of outer circulation pipeline 101 as shown in Figure 4.Certainly, this operation also can just make outer circulation pipeline 101 at first be full of gas to be tested when measuring at the beginning, and then purifies internal recycle pipeline 102 and gather background gas.
Now, due to outer circulation pipeline 101 and the in store different gas of internal recycle pipeline 102 difference, after opening by-pass valve control 103, internal recycle pipeline 102 and outer circulation pipeline 101 will conducting form a systemic circulation.Starting 110, two kinds of gases of even air pump will evenly mix, and the mixed gas rapid flow of now systemic circulation flows to as shown in Figure 7, thereby makes air chamber 104 and outer circulation pipeline 101, internal recycle pipeline 102 all be full of mixed gas.
Close even air pump 110, gas flow to be mixed is relatively static, be arranged on the infrared probe of air chamber 104 the insides, the meeting startup is carried out infrared ray to air chamber 104 the inside mixed gass and is repeatedly irradiated, draw the stable measured value of mixed gas (spectrum line), then the spectrum line of the mixed gas of measuring is transferred in controller and is calculated, draw the spectrum line of gas to be measured, analyze conversion by the spectrum line to gas to be measured, finally draw the concentration of gas to be measured.In other embodiment of the present invention, infrared light propagated sensation sensor also can calculate the spectrum line of gas to be measured by the spectrum computing module, then the spectrum line of gas to be measured is transferred in controller and analyzes conversion, draws the concentration of gas to be measured.
Therefore, gas concentration measurement system of the present invention, by the air inlet pusher, gas to be measured is pushed to rapidly in the gas switching device shifter, use an infrared light propagated sensation sensor just can realize multipath gas is gathered, via controller is calculated, is analyzed and changed the spectrum line measured again, can measure fast and accurately the concentration of each minimum gas, whole simple in measurement system structure, with low cost, easy operating.
These are only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (10)
1. a gas concentration measuring method, is characterized in that, comprising:
Gather background gas, and measure the spectrum line that obtains described background gas;
Gather the gas to be measured in measured zone;
The gas to be measured collected is mixed with background gas;
Mixed mixed gas is measured, and calculated the spectrum line of gas to be measured according to the spectrum line of background gas; And
Analyze the spectrum line of gas to be measured, and calculate the concentration of gas to be measured according to peak height value gas transfer algorithm.
2. gas concentration measuring method according to claim 1, is characterized in that, the spectrum line of described analysis gas to be measured, and specifically comprise according to the step that peak height value gas transfer algorithm calculates the concentration of gas to be measured:
The spectrum line of gas to be measured is converted to corresponding wave number;
Search mxm. in rear each gas wave-number range of conversion;
Search the average straight-line equation according to the spectrum line of gas to be measured and the wave number value after conversion, calculate the peak height value of gas to be measured by the mxm. of searching; And
The peak height value of gas to be measured is converted to concentration.
3. gas concentration measuring method according to claim 2, is characterized in that, the wave number value after the described spectrum line according to gas to be measured and conversion is searched the average straight-line equation, and the step of calculating the peak height value of gas to be measured by the mxm. of searching specifically comprises:
According to the spectrum line of gas to be measured and the wave number value after conversion, find the point coordinates of the most close baseline starting point and terminal by the circulation array, obtain the average straight-line equation;
The corresponding described average straight-line equation of wave number substitution the mxm. found, obtain intersection point numerical value; And
Deduct by mxm. the peak height value that the number of hits value obtains gas to be measured.
4. gas concentration measuring method according to claim 2, is characterized in that, the change type that the described value of the peak height by gas to be measured is converted to concentration is as follows:
Gas concentration value=the first gas concentration coefficient * peak height value * peak height value+second gas concentration coefficient * peak height value; Wherein, the first gas concentration coefficient, the second gas concentration coefficient are empirical value.
5. according to the described gas concentration measuring method of claim 1 to 4 any one, it is characterized in that, the spectrum line that the described spectrum line according to background gas calculates gas to be measured is the blending ratio a:b according to gas to be measured and background gas, calculates the spectrum line of gas to be measured by following change type:
The spectrum line of the spectrum line * (a+b) of the spectrum line=mixed gas of gas to be measured/a – background gas.
6. a gas concentration measurement system, is characterized in that, comprising:
Infrared light propagated sensation sensor, for calculating the spectrum line of gas by the infrared radiation aerometer;
The gas switching device shifter, for gathering the gas to be measured in background gas and measured zone, and the gas to be measured collected is mixed with background gas, it comprises the outer circulation pipeline that holds gas to be measured, the internal recycle pipeline that holds background gas, be arranged between described outer circulation pipeline and internal recycle pipeline, for controlling the by-pass valve control of described outer circulation pipeline and internal recycle pipeline conducting or cut-off, and be arranged on the air chamber be connected on described internal recycle pipeline, with described infrared light propagated sensation sensor;
Controller, be connected with described infrared light propagated sensation sensor, calculates the spectrum line of gas for analyzing described infrared light propagated sensation sensor, calculates the concentration of gas to be measured by peak height value gas transfer algorithm.
7. gas concentration measurement system according to claim 6, is characterized in that, described controller comprises:
The wave number modular converter, be converted to corresponding wave number for the spectrum line by gas to be measured;
Value is searched module, for searching after conversion mxm. in each gas wave-number range;
Spectrum peak height value computing module, search the average straight-line equation for the wave number value after the spectrum line according to gas to be measured and conversion, calculates the peak height value of gas to be measured by the mxm. of searching; And
The gas concentration modular converter, be converted to concentration for the peak height value by gas to be measured.
8. gas concentration measurement system according to claim 6, it is characterized in that, described gas switching device shifter also comprises the gas access to be measured that is arranged on described outer circulation pipeline place, be arranged on first air intake valve at place, described gas access to be measured, be arranged on the air admission hole that described inner circulating tube is said, be arranged on the second air intake valve of described air admission hole, drain tap, and carry out mixed uniformly even air pump for gas to be measured and the background gas in described internal recycle pipeline in the outer circulation pipeline sealing.
9. gas concentration measurement system according to claim 6, is characterized in that, this measuring system also comprises with described gas switching device shifter and being connected, for gas to be measured being pushed to the air inlet pusher of described gas switching device shifter.
10. gas concentration measurement system according to claim 9, it is characterized in that, described air inlet pusher comprises at least two passes, for the propelling air pump interior to the outer circulation pipeline gas propulsive to be measured, and be arranged between described passage and propelling air pump, for the change-over switch of switching channel.
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| CN201310449973.9A CN103454242B (en) | 2013-09-27 | 2013-09-27 | A kind of gas concentration measuring method and system thereof |
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| WO2016045000A1 (en) * | 2014-09-23 | 2016-03-31 | 深圳市先亚生物科技有限公司 | Method and apparatus for measuring endogenous co concentration in alveolar air |
| CN107430069A (en) * | 2015-01-27 | 2017-12-01 | 阿肯马法国公司 | The mancarried device of the concentration of hydrogen sulfide of on-line measurement waste gas |
| CN107941737A (en) * | 2017-11-21 | 2018-04-20 | 北京东宇宏达科技有限公司 | Methane gas quality inspection device and its detection method |
| CN111111526A (en) * | 2019-12-12 | 2020-05-08 | 桂林理工大学 | Two-stage continuous mixed gas high-temperature heating system |
| CN111201437A (en) * | 2017-10-13 | 2020-05-26 | 身体感官公司 | Fluid sensing device for portable electronic device |
| CN112945891A (en) * | 2021-02-05 | 2021-06-11 | 宁波普洛赛斯检测科技有限公司 | Air carbon monoxide measuring method and measuring instrument thereof |
| CN113720964A (en) * | 2020-05-26 | 2021-11-30 | 宁波方太厨具有限公司 | Formaldehyde detection system and air purification device applying same |
| CN114441477A (en) * | 2022-04-11 | 2022-05-06 | 华电智控（北京）技术有限公司 | Method and device for detecting concentration of gas based on wide absorption spectrum line |
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| WO2016045000A1 (en) * | 2014-09-23 | 2016-03-31 | 深圳市先亚生物科技有限公司 | Method and apparatus for measuring endogenous co concentration in alveolar air |
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