CN103454242B - A kind of gas concentration measuring method and system thereof - Google Patents
A kind of gas concentration measuring method and system thereof Download PDFInfo
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Abstract
A kind of gas concentration measuring method, comprising: gather background gas, and measures the spectrum line obtaining 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 calculates 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.Gas concentration measuring method of the present invention, utilize gas to the principle of absorption of light, from the measurement of mixed gas, draw the spectrum of gas to be measured according to the spectrum line of background gas, by the analysis of this spectrum and the mode of peak height value conversion, calculate the concentration of each minimum gas fast and accurately.In addition, present invention also offers a kind of gas concentration measurement system.
Description
Technical field
The present invention relates to gas concentration analytical technology, particularly relate to a kind of gas concentration measuring method and system thereof.
Background technology
In recent years; a lot of analytical equipment to gases such as the oxygen in building construction office, carbon dioxide has been there is in reality; but for the gas of trace; analysis and the device thereof of the gases such as such as CO, CH4, C2H4, C2H2, C2H6, H2 are little; but; when in environment, these minimum gas reach finite concentration; harmful to human body; also the phenomenon of device interior spontaneous combustion is likely caused; so the monitoring to these minimum gas, very large effect is played to the physical and mental health of human body and environmental protection.
In Chinese invention patent application prospectus, publication number " CN101776593A " name is called that " active gas detection method and warning device thereof " discloses a kind of active gas detection method, it is included in tested region and arranges infrared receiver and infrared generator in pairs, the situation of this infrared transmitting device arranged in pairs and infrared receiver detection infrared signal absorbed wavelength in atmosphere, by analyzing this to be measured the measured target gas corresponding to this wavelength concentration by the power of absorbing wavelength.But the detection method of this minimum gas needs to use multiple infrared sensor, 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 region 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, comprising: gather background gas, and measures the spectrum line obtaining 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 calculates 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 comprises 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 the rear each gas wave-number range of conversion; Search average straight-line equation according to the spectrum line of gas to be measured and the wave number value after changing, calculated the peak height value of gas to be measured by the mxm. searched; The peak height value of gas to be measured is converted to concentration.
Above-mentioned gas concentration measuring method, wherein: the described spectrum line according to gas to be measured and the wave number value after changing search average straight-line equation, the step 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 changing, find the point coordinates near baseline starting point and terminal by circulation array, obtain average straight-line equation; Wave number corresponding for the mxm. found is substituted into described average straight-line equation, obtains intersection point numerical value; The peak height value that number of hits value obtains gas to be measured is deducted by mxm..
Above-mentioned gas concentration measuring method, wherein: the change type that the described peak height value 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+the 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 spectrum line * (the a+b)/a – background gas of the spectrum line=mixed gas of gas to be measured.
In addition, the present invention also provides a kind of gas concentration measurement system, and structure is simple, with low cost, can measure the concentration of each minimum gas fast and accurately.
A kind of gas concentration measurement system, comprises infrared photosensitive sensors, gas switching device shifter, and controller.Wherein, infrared photosensitive sensors, for calculating the spectrum line of gas by infrared radiation aerometer.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 holding gas to be measured, hold the internal recycle pipeline of 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 photosensitive sensors.Controller is connected with described infrared photosensitive sensors, calculates the spectrum line of gas for analyzing described infrared photosensitive sensors, is calculated the concentration of gas to be measured by peak height value gas transfer algorithm.
Above-mentioned gas concentration measurement system, wherein: described controller comprises wave number modular converter, value searches module, spectrum peak high level computing module, and gas concentration modular converter.Wherein, wave number modular converter is used for the spectrum line of gas to be measured to be converted to corresponding wave number.Value searches module for searching after conversion mxm. in each gas wave-number range.Spectrum peak high level computing module is used for searching average straight-line equation according to the spectrum line of gas to be measured and the wave number value after changing, and is calculated the peak height value of gas to be measured by the mxm. searched.Gas concentration modular converter is used for the peak height value of gas to be measured to be converted to concentration.。
Above-mentioned gas concentration measurement system, wherein: described gas switching device shifter also comprises the gas access to be measured being arranged on described outer circulation pipeline place, be arranged on first air intake valve at described gas access to be measured place, 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 for the gas to be measured in the outer circulation pipeline closed and the background gas in described internal recycle pipeline are carried out mixed uniformly even air pump.
Above-mentioned gas concentration measurement system, wherein: this measuring system also comprises and being connected with described gas switching device shifter, 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 gas propulsive to be measured to the propelling air pump in outer circulation pipeline, and be arranged on described passage and advance between air pump, for the change-over switch of switching channel.
Compared with prior art, gas concentration measuring method of the present invention, utilize gas to the principle of absorption of light, from the measurement of mixed gas, the spectrum of gas to be measured is drawn according to the spectrum line of background gas, by to the analysis of this spectrum and the mode of peak height value conversion, calculate the concentration of each minimum gas fast and accurately.
Gas concentration measurement system of the present invention, the gas collected by infrared photosensitive sensors irradiation gas switching device shifter obtains corresponding spectrum, by to the analysis of spectrum and peak height value gas transfer algorithm, measure the concentration of each minimum gas fast and accurately, whole simple in measurement system structure, with low cost, be easy to operation.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of embodiment of the present invention gas concentration measuring method;
Fig. 2 is the refinement process flow diagram of step S105 in embodiment of the present invention Fig. 1;
Fig. 3 is the refinement process flow diagram of step S1053 in embodiment of the present invention Fig. 2;
Fig. 4 is the structural representation of embodiment of the present invention gas switching device shifter;
Fig. 5 is the structural representation of the invention process csr controller;
Fig. 6 is the structural representation of 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, realized object and effect, accompanying drawing is coordinated to be explained in detail below in conjunction with embodiment.
Figure 1 shows that the process flow diagram of embodiment of the present invention gas concentration measuring method.
Step S101, gathers background gas, and measures the spectrum line obtaining this background gas.
Spectrum line due to background gas is the reference value of the spectrum line as subsequent calculations gas to be measured, and 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 usually, gas relatively good from greening changes in little space, is gather certain gas gas as a setting near the point of greenbelt outdoor under normal circumstances.
Because various gas can to the characteristic of the wavelength absorption of certain section of light, optical sensor utilizes gas to this feature of the principle of absorption of light, carry out ultrared irradiation to the gaseous sample that will analyze, the light of returning through irradiating back reflection carries out spectral analysis, just can obtain specific gas peak height value.Therefore, embodiment of the present invention is first by the infrared radiation background gas of the infrared photosensitive sensors in gas concentration measurement system, draws the spectrum line of background gas.
Step S102, gathers the gas to be measured in measured zone.In embodiment of the present invention, gas concentration measuring method is that testing needle is tested a kind of gas concentration of gas, and the concentration determination that the multiple gases for two or more superposes is not in limit of consideration.In other embodiment of the present invention, step S102 also can perform before step S101, repeated no more herein.
Step S103, mixes the gas to be measured collected with background gas.In embodiment of the present invention, be that the gas to be measured collected is mixed by the ratio uniform preset with background gas.In order to convenience of calculation, normally the gas to be measured collected is mixed with the ratio of background gas in 1:1.
Step S104, measures mixed mixed gas, and calculates 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 measure when making mixed gas geo-stationary get off.In embodiment of the present invention, the spectrum line calculating 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 spectrum line * (the a+b)/a – background gas of the spectrum line=mixed gas of gas to be measured.
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 taking multiple measurements mixed gas, obtain many groups measured value of mixed gas, by getting the mode of the mean value of many group measured values, improving measuring accuracy.
Step S105, analyzes the spectrum line of gas to be measured, and calculates 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 gas to the principle of absorption of light, first measure the spectrum line of background gas, then spectrum line measurement is carried out to mixed gas, thus obtain the spectrum line of gas to be measured, analyze finally by the spectrum of gas to be measured, and by peak height value gas transfer algorithm, calculate the concentration of each minimum gas fast and accurately, be a kind of flexibly, the analysis method for gases of environmental protection, favourable guarantee is provided 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, is converted to corresponding wave number by the spectrum line of gas to be measured.
Spectrum line due to the gas to be measured calculated is the great spectrum line of data volume, belongs to the array of one dimension, and we need this one-dimensional data to convert corresponding wave number to, and conversion formula is as follows:
RWave[i]=K*i+b;
K=(ToRange–FromRange)/(RPoint-1);
b=FromRange;
Wherein: FromRange is the starting point of spectrum line, be empirical value (empirical value is here the factory-said value of infrared sensor infrared probe); ToRange is the terminal of spectrum line, is empirical value (empirical value is here the factory-said value of infrared sensor infrared probe); RPoint is the number (obtaining the array that can read from infrared photosensitive sensors) of spectrum line array; RWave is corresponding wave number array, the array index that i and RPoint is here corresponding.
Step S1052, searches mxm. in the rear each gas wave-number range of conversion.
Usually, each gas has corresponding wave-number range on spectrum line, below for carbon monoxide (CO), its wave-number range as: COPeakStart is carbon monoxide wave-number range starting point, is empirical value (empirical value here tests by doing the result that draws); COPeakEnd is the terminal of carbon monoxide wave-number range, is empirical value (empirical value is here by doing the result of testing and drawing).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, carries out bubbling algorithm, maximizing to data).
Step S1053, is searched average straight-line equation according to the spectrum line of gas to be measured and the wave number value after changing, is calculated the peak height value of gas to be measured by the mxm. searched.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 changing, finds the point coordinates near baseline starting point and terminal by circulation array, obtains average straight-line equation.
Usually, each gas is spectrally having a gas baseline, and gas baseline comprises starting point and terminal, as: COBaseStart is the starting point of CO gas baseline, is empirical value (empirical value is here by doing the result of testing and drawing); COBaseEnd is the terminal of CO gas baseline, is empirical value (empirical value is here by doing the result of testing and drawing).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 changing, find the point coordinates near baseline starting point and terminal by circulation array: COX1, COY1 are the carbon monoxide baseline starting point coordinate values near baseline starting point empirical value, COX2, COY2 are the carbon monoxide baseline terminal coordinate values near baseline terminal empirical value.Because average straight-line equation is a linear equation in two unknowns, therefore, calculated by the coordinate figure equation of starting point and terminal, this binary average straight-line equation once can be obtained.
Step S10532, substitutes into this average straight-line equation wave number corresponding for the mxm. found, obtains intersection point numerical value.For carbon monoxide:
COYMax=((COY2 – COY1) * COMaxPos+ (COY1*COX1 – COY2*COX2))/(COX2-COX1); Wherein, COYMax is the intersection point numerical value of carbon monoxide, is 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, deducts by mxm. the peak height value that number of hits value obtains gas to be measured.That is, COHeight=COMaxData – COYMax.Wherein, COHeight is the peak height value of carbon monoxide.
Step S1054, is converted to concentration by the peak height value of gas to be measured.In embodiment of the present invention, the change type that the peak height value of 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+the second gas concentration coefficient * peak height value; Wherein, the first gas concentration coefficient, the second gas concentration coefficient are empirical value.
For carbon monoxide, then the gas concentration value COGas=COP1*COHeight*COHeight+COP2*COHeight of carbon monoxide;
Wherein: COP1: be carbon monoxide gas concentration coefficient 1, be empirical value; COP2: be 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 infrared photosensitive sensors, gas switching device shifter 10(as shown in Figure 4) and controller (not shown).
In embodiment of the present invention, infrared photosensitive sensors comprises test air chamber, infrared probe and spectrum computing module.Mainly realize the calculating of the gaseous spectrum in air chamber.That is, the spectrum line of gas is calculated by infrared radiation aerometer.
The gas to be measured collected for gathering the gas to be measured in background gas and measured zone, and mixes with gas by gas switching device shifter 10.It comprises the outer circulation pipeline 101 holding gas to be measured, hold the internal recycle pipeline 102 of 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 conducting or cut-off, and be arranged on the air chamber 104 be connected on internal recycle pipeline 102, with infrared photosensitive sensors.Wherein, background gas is cleaner air, the general air using outdoor close 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 line 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 being arranged on outer circulation pipeline place, be arranged on first air intake valve 106 at gas access to be measured place, 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 for the gas to be measured in the outer circulation pipeline 101 closed and the background gas in internal recycle pipeline 102 are carried out mixed uniformly even air pump 110.Wherein, air admission hole 107 can also be arranged and advance air pump (not shown), repeat no more herein.
Controller is connected with infrared photosensitive sensors, calculates the spectrum line of gas for analyzing infrared photosensitive sensors, is calculated 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 be separated setting with gas switching device shifter 10.When controller to be separated with gas switching device shifter 10 arrange time, it can be smart mobile phone, computing machine, personal digital assistant (PersonalDigitalAssistant, PDA) etc.
Therefore, gas concentration measurement system of the present invention, the gas collected by infrared photosensitive sensors irradiation gas switching device shifter obtains corresponding spectrum, by to the analysis of spectrum and peak height value gas transfer algorithm, measure the concentration of each minimum gas fast and accurately, whole simple in measurement system structure, with low cost, be easy to operation.
Consulting Fig. 5, is the structural representation of the invention process csr controller 20.Controller 20 comprises wave number modular converter 201, value and searches module 202, spectrum peak high level computing module 203 and gas concentration modular converter 204.
Wave number modular converter 201 is for being converted to corresponding wave number by the spectrum line of gas to be measured.Spectrum line due to the gas to be measured calculated is the great spectrum line of data volume, belongs to the array of one dimension, and we need this one-dimensional data to convert corresponding wave number to, and conversion formula is as follows:
RWave[i]=K*i+b;
K=(ToRange–FromRange)/(RPoint-1);
b=FromRange;
Wherein, FromRange is the starting point of spectrum line, is empirical value (empirical value is here the factory-said value of infrared sensor infrared probe); ToRange is the terminal of spectrum line, is empirical value (empirical value is here the factory-said value of infrared sensor infrared probe); RPoint is the number (obtaining the array that can read from infrared photosensitive sensors) of spectrum line array; RWave is corresponding wave number array, the array index that i and RPoint is here corresponding.
Value searches 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 for carbon monoxide (CO), its wave-number range as: COPeakStart is carbon monoxide wave-number range starting point, is empirical value (empirical value here tests by doing the result that draws); COPeakEnd is the terminal of carbon monoxide wave-number range, is empirical value (empirical value is here by doing the result of testing and drawing).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, carries out bubbling algorithm, maximizing to data).
Spectrum peak high level computing module 203, for searching average straight-line equation according to the spectrum line of gas to be measured and the wave number value after changing, calculates the peak height value of gas to be measured by the mxm. searched.In embodiment of the present invention, spectrum peak high level 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, average straight-line equation computing unit 2031, for according to the spectrum line of gas to be measured and the wave number value after changing, finds the point coordinates near baseline starting point and terminal by circulation array, obtains average straight-line equation.Usually, each gas is spectrally having a gas baseline, and gas baseline comprises starting point and terminal, because average straight-line equation is a linear equation in two unknowns, therefore, calculated by the coordinate figure equation of starting point and terminal, this binary average straight-line equation once can be obtained.Intersection point numerical calculation unit 2032, for wave number corresponding for the mxm. found is substituted into this average straight-line equation, obtains intersection point numerical value.Peak height value computing unit 2033 obtains the peak height value of gas to be measured for being deducted number of hits value by mxm..
Gas concentration modular converter 204 is for being converted to concentration by the peak height value of gas to be measured.Herein, to be converted to the change type of concentration as follows for peak height value:
Gas concentration value=the first gas concentration coefficient * peak height value * peak height value+the 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 comprises and being connected with gas switching device shifter, for gas to be measured being pushed to the air inlet pusher of gas switching device shifter.In embodiment of the present invention, air inlet pusher is 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 gas propulsive to be measured to the propelling air pump 302 in outer circulation pipeline, and be arranged on passage and advance between air pump, for the change-over switch (not shown) of switching channel.Adopt at least two passes 301, the gas sample collection to different distributions regional air can be realized.In embodiment of the present invention, every bar passage 301 inside is provided with valve (not shown), by each channel valve and the control advancing air pump 302, multiplexer channel gas can be realized control to push, certainly, in propelling movement process, the function that air inlet pusher 30 each time period only has a road gas and pushing need be guaranteed, therefore, air inlet pusher 30 and gas switching device shifter 20 just can be combined to form multipath gas cyclic switching.
In addition, the quantity of air inlet pusher 30 also can be two or more, and the outlet of air inlet pusher can connect a certain feeder connection of another air inlet pusher, thus realizes the acquisition function of Distributed Area gas.
The principle of work of gas switching device shifter 10 is as follows:
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 and outer circulation pipeline 101 cannot conductings.
Then gas in internal recycle pipeline 102 is purified, Resurvey background gas.The second air intake valve 108 and drain tap 109 are opened in detailed operation, start the propelling air pump (not shown) be connected on air admission hole 107, the background gas in the external world is advanced to internal recycle pipeline 102, flow fast shown in Fig. 4 internal recycle pipeline 102 gas flow, the gas carried over before is emitted through the drain tap 109 opened, at this moment air chamber will store cleaner gas, reaches air chamber 104 Air purification.
After air chamber 104 purifies, by closing the second air intake valve 108 and drain tap 109 closes internal recycle pipeline 102.When background gas geo-stationary in internal recycle pipeline 102 gets off, be arranged on the infrared probe inside air chamber 104, can start and infrared ray is carried out to background gas inside air chamber 101 repeatedly irradiate, draw the measured value (spectrum line) that background gas is stable.
Afterwards, gas to be tested is gathered.Open the first air intake valve 106, outer circulation pipeline 101 and outside gas to be tested is connected, if now start the propelling air pump of air inlet pusher, then outer circulation pipeline 101 will be full of rapidly gas to be tested, and in outer circulation pipeline 101, gas flow as shown in Figure 4.Certainly, this operation also just can make outer circulation pipeline 101 first be full of gas to be tested when measurement at the beginning, and then purifies internal recycle pipeline 102 and gather background gas.
Now, due to outer circulation pipeline 101 and internal recycle pipeline 102 in store different gas respectively, after opening by-pass valve control 103, internal recycle pipeline 102 and outer circulation pipeline 101 conducting will form a systemic circulation.Starting even air pump 110, two kinds of gases will Homogeneous phase mixing, and the mixed gas of now systemic circulation flows fast, flows to as shown in Figure 7, thus 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 flowing geo-stationary to be mixed, be arranged on the infrared probe inside air chamber 104, can start and infrared ray is carried out to mixed gas inside air chamber 104 repeatedly irradiate, draw the measured value (spectrum line) that mixed gas is stable, then the spectrum line of the mixed gas measured is transferred in controller and calculates, draw the spectrum line of gas to be measured, by carrying out analysis conversion to the spectrum line of gas to be measured, finally draw the concentration of gas to be measured.In other embodiment of the present invention, infrared photosensitive sensors also can calculate the spectrum line of gas to be measured by spectrum computing module, then the spectrum line of gas to be measured is transferred in controller and carries out analysis conversion, draw the concentration of gas to be measured.
Therefore, gas concentration measurement system of the present invention, by air inlet pusher, gas to be measured is pushed to rapidly in gas switching device shifter, use an infrared photosensitive sensors just can realize gathering multipath gas, via controller calculates the spectrum line measured, analyze and changes again, can measure the concentration of each minimum gas fast and accurately, whole simple in measurement system structure, with low cost, be easy to operation.
These are only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. a gas concentration measuring method, is characterized in that, comprising:
Gather background gas, and measure the spectrum line obtaining 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 calculates 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; 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 the rear each gas wave-number range of conversion;
Search average straight-line equation according to the spectrum line of gas to be measured and the wave number value after changing, calculated the peak height value of gas to be measured by the mxm. searched; And
The peak height value of gas to be measured is converted to concentration.
2. gas concentration measuring method according to claim 1, is characterized in that, the described spectrum line according to gas to be measured and the wave number value after changing search average straight-line equation, and the step being calculated the peak height value of gas to be measured by the mxm. searched specifically is comprised:
According to the spectrum line of gas to be measured and the wave number value after changing, find the point coordinates near baseline starting point and terminal by circulation array, obtain average straight-line equation;
Wave number corresponding for the mxm. found is substituted into described average straight-line equation, obtains intersection point numerical value; And
The peak height value that number of hits value obtains gas to be measured is deducted by mxm..
3. gas concentration measuring method according to claim 1, is characterized in that, the change type that the described peak height value 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+the second gas concentration coefficient * peak height value; Wherein, the first gas concentration coefficient, the second gas concentration coefficient are empirical value.
4. the gas concentration measuring method according to claims 1 to 3 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 spectrum line * (the a+b)/a – background gas of the spectrum line=mixed gas of gas to be measured.
5. a gas concentration measurement system, is characterized in that, comprising:
Infrared photosensitive sensors, for calculating the spectrum line of gas by infrared radiation aerometer;
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 holding gas to be measured, hold the internal recycle pipeline of 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 photosensitive sensors;
Controller, is connected with described infrared photosensitive sensors, calculates the spectrum line of gas for analyzing described infrared photosensitive sensors, is calculated the concentration of gas to be measured by peak height value gas transfer algorithm; Wherein, described controller comprises:
Wave number modular converter, for being converted to corresponding wave number by the spectrum line of gas to be measured;
Value searches module, for searching after conversion mxm. in each gas wave-number range;
Spectrum peak high level computing module, for searching average straight-line equation according to the spectrum line of gas to be measured and the wave number value after changing, calculates the peak height value of gas to be measured by the mxm. searched; And
Gas concentration modular converter, for being converted to concentration by the peak height value of gas to be measured.
6. gas concentration measurement system according to claim 5, it is characterized in that, described gas switching device shifter also comprises the gas access to be measured being arranged on described outer circulation pipeline place, be arranged on first air intake valve at described gas access to be measured place, be arranged on the air admission hole at described internal recycle pipeline place, be arranged on the second air intake valve of described air admission hole, drain tap, and for the gas to be measured in the outer circulation pipeline closed and the background gas in described internal recycle pipeline are carried out mixed uniformly even air pump.
7. gas concentration measurement system according to claim 5, is characterized in that, this measuring system also comprises and being connected with described gas switching device shifter, for gas to be measured being pushed to the air inlet pusher of described gas switching device shifter.
8. gas concentration measurement system according to claim 7, it is characterized in that, described air inlet pusher comprises at least two passes, for gas propulsive to be measured to the propelling air pump in outer circulation pipeline, and be arranged on described passage and advance between air pump, for the change-over switch of switching channel.
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| FR3032035B1 (en) * | 2015-01-27 | 2022-07-15 | Arkema France | TRANSPORTABLE DEVICE FOR ON-LINE MEASUREMENT OF THE HYDROGEN SULPHIDE CONCENTRATION OF A GAS EFFLUENT |
| EP3470835B1 (en) * | 2017-10-13 | 2023-03-22 | BoydSense, Inc. | Fluid sensing device for a portable electronic device |
| 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 |
| CN111111526B (en) * | 2019-12-12 | 2021-10-22 | 桂林理工大学 | Two-stage continuous mixed gas high-temperature heating system |
| CN113720964B (en) * | 2020-05-26 | 2023-04-14 | 宁波方太厨具有限公司 | Formaldehyde detection system and air purification device applying same |
| CN112945891B (en) * | 2021-02-05 | 2024-05-03 | 宁波普洛赛斯检测科技有限公司 | Air carbon monoxide measuring method and measuring instrument thereof |
| CN114441477B (en) * | 2022-04-11 | 2022-07-01 | 华电智控（北京）技术有限公司 | Gas concentration detection method and device based on wide absorption spectrum line |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101706423A (en) * | 2009-09-30 | 2010-05-12 | 聚光科技(杭州)股份有限公司 | Laser gas absorption spectrum analyzing method |
| CN102279165A (en) * | 2011-04-19 | 2011-12-14 | 珠海市中科信息技术开发有限公司 | Online tail gas monitoring system for motor vehicle |
| CN103323413A (en) * | 2013-06-04 | 2013-09-25 | 中国石油化工股份有限公司 | Spectrum continuous gas logging device and method |
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| JPH01197631A (en) * | 1988-02-02 | 1989-08-09 | Ishikawajima Harima Heavy Ind Co Ltd | Gas concentration measuring method |
| US8953165B2 (en) * | 2010-10-21 | 2015-02-10 | Spectrasensors, Inc. | Validation and correction of spectrometer performance using a validation cell |
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| CN101706423A (en) * | 2009-09-30 | 2010-05-12 | 聚光科技(杭州)股份有限公司 | Laser gas absorption spectrum analyzing method |
| CN102279165A (en) * | 2011-04-19 | 2011-12-14 | 珠海市中科信息技术开发有限公司 | Online tail gas monitoring system for motor vehicle |
| CN103323413A (en) * | 2013-06-04 | 2013-09-25 | 中国石油化工股份有限公司 | Spectrum continuous gas logging device and method |
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