CN103076302B - A kind of gas concentration detection method and device - Google Patents
A kind of gas concentration detection method and device Download PDFInfo
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- CN103076302B CN103076302B CN201210591822.2A CN201210591822A CN103076302B CN 103076302 B CN103076302 B CN 103076302B CN 201210591822 A CN201210591822 A CN 201210591822A CN 103076302 B CN103076302 B CN 103076302B
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Abstract
A kind of gas concentration detection method that the application provides and device, first the method simulates the absorption coefficient curve under different temperatures pressure conditions, then the pressure detected value of gas to be measured is obtained, and according to the curve of the absorption coefficient second derivative under all temperature pressure conditions in this pressure detected value place pressure range of pressure detected value matching or toroidal function, then the temperature detection value of gas to be measured is obtained, finally according to the temperature detection value of gas to be measured, the curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value and pressure detected value place pressure range or toroidal function, in conjunction with the gas concentration of known gas concentration expression formula accounting temperature detected value and gas to be measured corresponding to pressure detected value, make when measuring the gas concentration of gas to be measured, temperature pressure compensation is carried out to gas concentration algorithm, thus ensure the measuring accuracy of gas concentration.
Description
Technical field
The application relates to laser gas analyzer technical field, particularly relates to a kind of gas concentration detection method and device.
Background technology
Laser gas analyzer is mainly for detection of gas concentration to be measured.Laser gas analyzer is mainly used in the detection of trace gas composition in the industrial production, the mechanism that can be formed for dusty gas in research air and condition, in air the harm of dusty gas on ecologic environment and the impact on global environmental change unique technological means and novel research platform are provided.
Laser analyzer is mainly based on tunable diode laser absorption spectroscopy (TunableDiodeLaserAbsorptionSpectroscopy, TDLAS) technology realizes, TDLAS technology is the one of spectral absorption technology, and this technology is a kind of method of the principle measure gas concentrations being absorbed the laser of specific wavelength by gas molecule " frequency-selecting ".Specifically, when the laser beam of the specific wavelength that semiconductor laser goes out is through gas to be measured, gas to be measured absorbs laser beam, and cause laser intensity to produce decay, the decay of laser intensity is directly proportional to gas content to be measured.Therefore, just can analyze by measuring laser intensity dampening information the concentration obtaining gas to be measured.
Based on the laser gas analyzer mainly foundation of TDLAS technical design
calculate gas concentration to be measured, wherein, σ
vmodulating frequency,
second harmonic maximal value, F
2maxfor absorption coefficient spectral line line style second derivative maximal value, P is gas pressure intensity to be measured, and L is total optical path, I
0for incident light radiation intensity.
Can learn that from above formula gas concentration to be measured determined primarily of the second derivative of second harmonic and absorption coefficient spectral line line style.But in actual applications, absorption coefficient spectral line line style is easy to the impact by temperature and pressure, and under different temperatures pressure conditions, absorption coefficient spectral line line style is different, thus causes the measuring accuracy of gas concentration to be measured to reduce.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of gas concentration detection method and device, to realize when measure gas concentrations, carrying out temperature pressure compensation, thus ensure the measuring accuracy of gas concentration to be measured to gas concentration algorithm to be measured.
To achieve these goals, the technical scheme that provides of the embodiment of the present application is as follows:
A kind of gas concentration detection method, comprising:
Absorption coefficient curve under matching different temperatures pressure conditions;
Obtain the pressure detected value of gas to be measured;
The curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in matching or toroidal function;
Obtain the temperature detection value of described gas to be measured;
Calculate the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value.
Preferably, the absorption coefficient curve under described matching different temperatures pressure conditions, comprising:
According to
absorption coefficient curve under matching different temperatures pressure conditions, wherein, described S (T) is line strength of absorption line, described in
it is absorption line linear function;
Described
wherein, described P is the general power of radiation spectral line, the power that described P (v) is radiation spectral line frequency when being v in cell frequency interval.
Preferably, the curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in described matching or toroidal function, comprising:
Judge whether described pressure detected value is positioned at the low pressure range pre-set or the high pressure range pre-set;
When the low pressure range pre-set described in described pressure detected value is positioned at, determine that the curvilinear function of described absorption coefficient second derivative is:
f(x)=-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value;
When the high pressure range pre-set described in described pressure detected value is positioned at, determine that the toroidal function of described absorption coefficient second derivative is:
f(x)=-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
Preferably, the curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in described matching or toroidal function, comprising:
Judge described pressure detected value whether be positioned at described in the low pressure range that pre-sets;
When the low pressure range pre-set described in described pressure detected value is positioned at, determine that the curvilinear function of described absorption coefficient second derivative is:
f(x)=-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value.
Preferably, the curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in described matching or toroidal function, comprising:
Judge described pressure detected value whether be positioned at described in the high pressure range that pre-sets;
When the high pressure range pre-set described in described pressure detected value is positioned at, determine that the toroidal function of described absorption coefficient second derivative is:
f(x)=-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
Preferably, the gas concentration of the described temperature detection value of described calculating and gas described to be measured corresponding to described pressure detected value, comprising:
Utilize described temperature detection value and described pressure detected value, in conjunction with curve or the toroidal function of described absorption coefficient second derivative, determine the absorption coefficient spectral line line style second derivative maximal value of described gas to be measured;
Gas concentration expression formula is calculated according to known gas concentration expression formula;
Obtain the second harmonic maximal value of described gas to be measured;
Utilize the absorption coefficient spectral line line style second derivative maximal value of the absorption coefficient spectral line line style second derivative maximal value of the second harmonic maximal value of the pressure of the concentration of known marked gas, known marked gas, known marked gas, known marked gas, the pressure of described gas to be measured, the second harmonic maximal value of described gas to be measured and described gas to be measured, calculate the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value in conjunction with gas concentration expression formula.
Preferably, comprise the first fitting unit, the first acquiring unit, the second fitting unit, second acquisition unit, computing unit, wherein,
Described first fitting unit is used for the absorption coefficient curve under matching different temperatures pressure conditions;
Described first acquiring unit is for obtaining the pressure detected value of gas to be measured;
Described second fitting unit is connected with described first acquiring unit, for curve or the toroidal function of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in matching;
Described second acquisition unit is for obtaining the temperature detection value of described gas to be measured;
Described computing unit is connected with described second fitting unit with described first acquiring unit, described second acquisition unit respectively, for calculating the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value.
Preferably, described second fitting unit comprises: judging unit sum functions determining unit, wherein,
Described judging unit is connected with described first acquiring unit, for judge described pressure detected value whether be positioned at described in the low pressure range that pre-sets or described in the high pressure range that pre-sets;
One end of described function determining unit is connected with described first fitting unit, and the other end is connected with described judging unit, when the low pressure range pre-set described in described pressure detected value is positioned at, determines that the curvilinear function of described absorption coefficient second derivative is:
f(x)=-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value;
When the high pressure range pre-set described in described pressure detected value is positioned at, determine that the toroidal function of described absorption coefficient second derivative is:
f(x)=-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
Preferably, described computing unit comprises: derivative calculations unit, expression formula computing unit, acquiring unit and gas concentration computing unit, wherein,
Described derivative calculations unit is connected with described first acquiring unit, second acquisition unit sum functions determining unit respectively, for utilizing described temperature detection value and described pressure detected value, in conjunction with curve or the toroidal function of described absorption coefficient second derivative, determine the absorption coefficient spectral line line style second derivative maximal value of described gas to be measured;
Expression formula computing unit is used for calculating gas concentration expression formula according to known gas concentration expression formula;
Described acquiring unit is for obtaining the second harmonic maximal value of described gas to be measured;
Described gas concentration calculate unit respectively with derivative calculations unit, expression formula computing unit, acquiring unit is connected with the first acquiring unit, for utilizing the concentration of known marked gas, the pressure of known marked gas, the second harmonic maximal value of known marked gas, the absorption coefficient spectral line line style second derivative maximal value of known marked gas, the pressure of described gas to be measured, the second harmonic maximal value of described gas to be measured and the absorption coefficient spectral line line style second derivative maximal value of described gas to be measured, the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value is calculated in conjunction with described gas concentration expression formula.
As can be seen here, a kind of gas concentration detection method that the embodiment of the present application provides and device, first the method simulates the absorption coefficient curve under different temperatures pressure conditions, then the pressure detected value of gas to be measured is obtained, and according to the curve of the absorption coefficient second derivative under all temperature pressure conditions in this pressure detected value place pressure range of pressure detected value matching or toroidal function, then the temperature detection value of gas to be measured is obtained, finally according to the temperature detection value of gas to be measured, the curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value and pressure detected value place pressure range or toroidal function, in conjunction with the gas concentration of known gas concentration expression formula accounting temperature detected value and gas to be measured corresponding to pressure detected value, make when measuring the gas concentration of gas to be measured, temperature pressure compensation is carried out to gas concentration algorithm, thus ensure the measuring accuracy of gas concentration.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of gas concentration detection method process flow diagram that Fig. 1 provides for the embodiment of the present application one;
A kind of method flow diagram obtaining the pressure detected value of gas to be measured that Fig. 2 provides for the embodiment of the present application one;
A kind of method flow diagram obtaining the temperature detection value of gas to be measured that Fig. 3 provides for the embodiment of the present application one;
A kind of gas concentration detection method process flow diagram that Fig. 4 provides for the embodiment of the present application two;
A kind of gas concentration detection apparatus that Fig. 5 provides for the embodiment of the present application three;
The detailed construction schematic diagram of a kind of first acquiring unit that Fig. 6 provides for the embodiment of the present application three;
The detailed construction schematic diagram of a kind of second fitting unit that Fig. 7 provides for the embodiment of the present application three;
The detailed construction schematic diagram of a kind of first acquiring unit that Fig. 8 provides for the embodiment of the present application three;
The detailed construction schematic diagram of a kind of computing unit that Fig. 9 provides for the embodiment of the present application three.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
Embodiment one
A kind of gas concentration detection method process flow diagram that Fig. 1 provides for the embodiment of the present application one.
As shown in Figure 1, the method comprises:
Absorption coefficient curve under S101, matching different temperatures pressure conditions.
The mathematic(al) representation of absorption coefficient is:
wherein, S (T) is line strength of absorption line,
it is absorption line linear function.
Absorption line linear function
wherein, P is the general power of radiation spectral line, the power that P (v) is radiation spectral line frequency when being v in cell frequency interval.
Absorption line linear function
at v=v
0time have maximal value
and will formula be met
Δ v be called line width.
Spectral line broadening determines primarily of Vogit line style, and Vogit line style can be write as:
Wherein,
Wherein, γ
airfor air broadening, T is absolute temperature, and P is pressure, N=0.5, Δ v
gfor Gaussian lineshape half-breadth, x is lorentzian curve half-breadth Δ v
lwith Vogit line style half-breadth Δ v
vratio, g
v(v
0) be that Vogit Absorption Line is at centre frequency v
0the value at place.
Absorption coefficient curve α (v) under different temperatures pressure conditions can be simulated by above-mentioned mathematical derivation.
S102, obtain the pressure detected value of gas to be measured.
In the embodiment of the present application, at gas present position to be measured setting pressure sensor, the pressure values of gas present position to be measured can be measured in real time by pressure transducer, using the pressure values that records as pressure detected value.
In the embodiment of the present application, pressure transducer may break down and cause the pressure values of the gas to be measured measured inaccurate, also pressure transducer may be caused to work as the secondary pressure values detected because of external interference inaccurate.Therefore, in order to make the pressure detected value of the gas to be measured obtained more accurate, the embodiment of the present application provides a kind of method obtaining the pressure detected value of gas to be measured.
A kind of method flow diagram obtaining the pressure detected value of gas to be measured that Fig. 2 provides for the embodiment of the present application one.
As shown in Figure 2, the method comprises:
The pressure values of S201, in real time detection gas to be measured.
In the embodiment of the present application, at gas present position to be measured setting pressure sensor, the pressure values of gas to be measured can be detected in real time by pressure transducer.
S202, calculate the difference of the pressure values that adjacent twice detection obtains.
S202, judge the size of difference and preset difference value.
S204, calculate the average of the pressure values that adjacent twice detection obtains.
When difference is less than preset difference value, illustrate this pressure transducer working properly/external interference factor is very little, at this moment calculates the average of the pressure values that adjacent twice detection obtains.
S205, average is defined as the pressure detected value of gas to be measured.
The average of the pressure values adjacent twice detection obtained is defined as the pressure detected value of gas to be measured, by the average of pressure values that adjacent twice detection the is obtained pressure detected value as gas to be measured, reduce the pressure values that obtained by the one-shot measurement error as pressure detected value, make the pressure detected value of this gas to be measured obtained more accurate.
The curve of the absorption coefficient second derivative under all temperature pressure conditions in S103, matching pressure detected value place pressure range or toroidal function.
When pressure detected value is greater than 0.5 standard atmospheric pressure, when being less than 1.2 standard atmospheric pressures, judge that this pressure detected value is positioned at low pressure range, now, in conjunction with the absorption coefficient curve under different temperatures pressure conditions, the curvilinear function of the absorption coefficient second derivative under all temperature pressure conditions in matching low pressure range.
When pressure detected value is more than or equal to 1.2 standard atmospheric pressures, when being less than or equal to 3 standard atmospheric pressures, judge that this pressure detected value is positioned at high pressure range, now, in conjunction with the absorption coefficient curve under different temperatures pressure conditions, the toroidal function of the absorption coefficient second derivative under all temperature pressure conditions in matching high pressure range.
In the embodiment of the present application, when pressure detected value is greater than 0.5 standard atmospheric pressure, when being less than 1.2 standard atmospheric pressures, judge that this pressure detected value is positioned at low pressure range just a kind of optimal way, inventor can arrange arbitrarily the scope of low pressure according to the demand of oneself, be greater than 0.2 standard atmospheric pressure as pressure detected value can be arranged to when pressure detected value, when being less than or equal to 1.7 standard atmospheric pressures, judge that this pressure detected value is positioned at low pressure range.
In like manner, in the embodiment of the present application, when pressure detected value is more than or equal to 1.2 standard atmospheric pressures, when being less than or equal to 3 standard atmospheric pressures, judge that this pressure detected value is positioned at high pressure range just a kind of optimal way, inventor can arrange arbitrarily the scope of high pressure according to the demand of oneself, as being arranged to be more than or equal to 1.9 standard atmospheric pressures when pressure detected value, when being less than 4 standard atmospheric pressures, judge that this pressure detected value is positioned at high pressure range.
S104, obtain the temperature detection value of gas to be measured.
In the embodiment of the present application, at gas present position to be measured mounting temperature sensor, the temperature value of gas present position to be measured can be measured in real time by temperature sensor, using the temperature value that records as temperature detection value.
In the embodiment of the present application, the temperature sensor temperature value of gas to be measured causing measuring that may break down is inaccurate, also may because external interference cause temperature sensor when the temperature value time to detect inaccurate.Therefore, in order to make the temperature detection value of the gas to be measured obtained more accurate, the embodiment of the present application provides a kind of method obtaining the temperature detection value of gas to be measured.
A kind of method flow diagram obtaining the temperature detection value of gas to be measured that Fig. 3 provides for the embodiment of the present application one.
As shown in Figure 3, the method comprises:
The temperature value of S301, in real time detection gas to be measured.
In the embodiment of the present application, at gas present position to be measured mounting temperature sensor, the temperature value of gas to be measured can be detected in real time by temperature sensor.
S303, calculate the difference of the temperature value that adjacent twice detection obtains.
S303, judge the size of difference and preset difference value.
S304, calculate the average of the temperature value that adjacent twice detection obtains.
When difference is less than preset difference value, illustrate this temperature sensor working properly/external interference factor is very little, at this moment calculates the average of the temperature value that adjacent twice detection obtains.
S305, average is defined as the temperature detection value of gas to be measured.
The average of the temperature value adjacent twice detection obtained is defined as the temperature detection value of gas to be measured, by the average of temperature value that adjacent twice detection the is obtained temperature detection value as gas to be measured, reduce the temperature value that obtained by the one-shot measurement error as temperature detection value, make the temperature detection value of this gas to be measured obtained more accurate.
The gas concentration of the gas to be measured that S105, accounting temperature detected value and pressure detected value are corresponding.
First this step utilizes temperature detection value and pressure detected value, in conjunction with curve or the toroidal function of absorption coefficient second derivative, determine the absorption coefficient spectral line line style second derivative maximal value of gas to be measured, then gas concentration expression formula is calculated according to known gas concentration expression formula, and obtain the second harmonic maximal value of gas to be measured, finally utilize the concentration of known marked gas, the pressure of known marked gas, the second harmonic maximal value of known marked gas, the absorption coefficient spectral line line style second derivative maximal value of known marked gas, the pressure of gas to be measured, the second harmonic maximal value of gas to be measured, the absorption coefficient spectral line line style second derivative maximal value of gas to be measured, in conjunction with the gas concentration of gas concentration expression formula accounting temperature detected value and gas to be measured corresponding to pressure detected value.
The embodiment of the present application is a kind of optimal way, and in the industrial operation process of reality, inventor, in order to save detection time, can also proceed as follows:
Inventor can simulate the absorption coefficient curve under different temperatures pressure conditions in advance, then simulate the curvilinear function of the absorption coefficient second derivative under all temperature pressure conditions in the toroidal function of the absorption coefficient second derivative under all temperature pressure conditions in high pressure range and low pressure range according to this absorption coefficient curve respectively, and obtain two functions are prestored.
Like this in practical application in industry, inventor just can directly obtain pressure detected value, then judge that pressure detected value is positioned at high pressure range or low pressure range, when pressure detected value is positioned at high pressure range, utilize pressure detected value, and obtain temperature detection value and the second harmonic maximal value of gas to be measured, then in conjunction with the toroidal function of the absorption coefficient second derivative under all temperature pressure conditions in corresponding high pressure range, calculate the gas concentration of gas to be measured.
When pressure detected value is positioned at low pressure range, utilize pressure detected value, and obtain temperature detection value and the second harmonic maximal value of gas to be measured, then in conjunction with the curvilinear function of the absorption coefficient second derivative under all temperature pressure conditions in corresponding low pressure range, the gas concentration of gas to be measured is calculated.
As can be seen here, a kind of gas concentration detection method that the embodiment of the present application provides, first the method simulates the absorption coefficient curve under different temperatures pressure conditions, then the pressure detected value of gas to be measured is obtained, and according to the curve of the absorption coefficient second derivative under all temperature pressure conditions in this pressure detected value place pressure range of pressure detected value matching or toroidal function, then the temperature detection value of gas to be measured is obtained, finally according to the temperature detection value of gas to be measured, the curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value and pressure detected value place pressure range or toroidal function, in conjunction with the gas concentration of known gas concentration expression formula accounting temperature detected value and gas to be measured corresponding to pressure detected value, make when measuring the gas concentration of gas to be measured, temperature pressure compensation is carried out to gas concentration algorithm, thus ensure the measuring accuracy of gas concentration.
Embodiment two
A kind of gas concentration detection method process flow diagram that Fig. 4 provides for the embodiment of the present application two, the method comprises:
Absorption coefficient curve under S401, matching different temperatures pressure conditions.
S402, obtain the pressure detected value of gas to be measured.
The step S401-S402 that the embodiment of the present application two provides respectively with the step S101-S102 one_to_one corresponding in above-described embodiment one, the detailed description of the step S401-S402 that the embodiment of the present application two provides refers to the step S101-S102 in the embodiment of the present application one, does not repeat them here.
S403, judge whether pressure detected value is positioned at the low pressure range pre-set.
In the embodiment of the present application, when the pressure detected value of gas to be measured is greater than 0.5 standard atmospheric pressure, when being less than 1.2 standard atmospheric pressures, judge that this pressure detected value is positioned at low pressure range.
In the embodiment of the present application, when pressure detected value is greater than 0.5 standard atmospheric pressure, when being less than 1.2 standard atmospheric pressures, judge that this pressure detected value is positioned at low pressure range just a kind of optimal way, inventor can arrange arbitrarily the scope of low pressure according to the demand of oneself, be greater than 0.2 standard atmospheric pressure as pressure detected value can be arranged to when pressure detected value, when being less than or equal to 1.7 standard atmospheric pressures, judge that this pressure detected value is positioned at low pressure range.
S404, determine the curvilinear function of absorption coefficient second derivative.
When judging that the pressure detected value of gas to be measured is positioned at the low pressure range pre-set, the inhomogeneous broadening that the broadening mainly Doppler effect of absorption line causes, linear function now can represent by Gaussian lineshape, and Gaussian lineshape function is:
wherein, Δ v
gfor Gaussian lineshape half-breadth, T is absolute temperature, and M is molecular quality.
According to Gaussian lineshape function, when judging that the pressure detected value of gas to be measured is positioned at the low pressure range pre-set, line broadening is mainly caused by temperature.Obtain when judging that the pressure detected value of gas to be measured is positioned at the low pressure range pre-set according to Gaussian lineshape, the curvilinear function of this absorption coefficient second derivative is:
f(x)=-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value.
When judging that the pressure detected value of gas to be measured is not positioned at the low pressure range pre-set, perform step S405.
S405, judge whether pressure detected value is positioned at the high pressure range pre-set.
In the embodiment of the present application, when the pressure detected value of gas to be measured is more than or equal to 1.2 standard atmospheric pressures, when being less than or equal to 3 standard atmospheric pressures, judge that this pressure detected value is positioned at high pressure range.
In the embodiment of the present application, when pressure detected value is more than or equal to 1.2 standard atmospheric pressures, when being less than or equal to 3 standard atmospheric pressures, judge that this pressure detected value is positioned at high pressure range just a kind of optimal way, inventor can arrange arbitrarily the scope of high pressure according to the demand of oneself, as being arranged to be more than or equal to 1.9 standard atmospheric pressures when pressure detected value, when being less than 4 standard atmospheric pressures, judge that this pressure detected value is positioned at high pressure range.
S406, determine the toroidal function of absorption coefficient second derivative.
When pressure detected value is positioned at the high pressure range pre-set, the broadening homogeneous broadening mainly caused by collision of absorption line, linear function now can represent with lorentzian curve, and lorentzian curve function is:
wherein, Δ v
lfor lorentzian curve half-breadth, T is absolute temperature, γ
airfor air broadening, P is pressure, N=0.5.
According to lorentzian curve function, when pressure detected value is positioned at the high pressure range pre-set, line broadening is caused jointly by temperature and pressure, obtain when pressure detected value is positioned at the high pressure range pre-set according to lorentzian curve, the toroidal function of this absorption coefficient second derivative is:
f(x)=-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
S407, obtain the temperature detection value of gas to be measured.
S408, determine absorption coefficient spectral line line style second derivative maximal value.
Utilize curve or the toroidal function of the absorption coefficient second derivative under all temperature pressure conditions in temperature detection value, pressure detected value and pressure detected value place pressure range, determine the absorption coefficient spectral line line style second derivative maximal value of this gas to be measured.
S409, calculating gas concentration expression formula.
Known gas concentration expression formula is:
wherein, σ
vmodulating frequency,
second harmonic maximal value, F
2maxfor absorption coefficient spectral line line style second derivative maximal value, P is the pressure of gas to be measured, and L is total optical path, I
0for incident light radiation intensity.
Pre-set marked gas, the gas concentration of this marked gas draws after calibration, and according to known gas concentration expression formula, marked gas concentration expression formula is:
wherein, σ
avfor the modulating frequency of marked gas,
for the second harmonic maximal value of marked gas, F
a2maxfor the absorption coefficient spectral line line style second derivative maximal value of marked gas, P
afor the pressure of marked gas, L
afor the total optical path of marked gas, I
a0for the incident light radiation intensity of marked gas.
According to known gas concentration expression formula, gas concentration expression formula to be measured is:
wherein, σ
bvfor the modulating frequency of gas to be measured,
for the second harmonic maximal value of gas to be measured, F
b2maxfor the absorption coefficient spectral line line style second derivative maximal value of gas to be measured, P
bfor the pressure of gas to be measured, L
bfor the total optical path of gas to be measured, I
b0for the incident light radiation intensity of gas to be measured.
By marked gas concentration expression formula and gas concentration expression formula to be measured, calculate gas concentration expression formula, this gas concentration expression formula is:
wherein, C
afor the concentration of marked gas, P
afor the pressure of marked gas,
for the second harmonic maximal value of marked gas, F
a2maxfor the absorption coefficient spectral line line style second derivative maximal value of marked gas, P
bfor the pressure of gas to be measured,
for the second harmonic maximal value of gas to be measured, F
b2maxfor the absorption coefficient spectral line line style second derivative maximal value of gas to be measured.
S410, obtain the second harmonic maximal value of gas to be measured.
S411, calculate the gas concentration of gas to be measured.
According to pressure detected value, second harmonic maximal value, the absorption coefficient spectral line line style second derivative maximal value of gas to be measured, calculates the gas concentration of this gas to be measured in conjunction with gas concentration expression formula.
In the embodiment of the present application, the execution sequence of step S403 and step S405 is a kind of optimal way, and inventor can according to the execution sequence of the demand of oneself any set-up procedure S403 and step S405.Meanwhile, comprise step S403 and step S405 also just a kind of optimal way in the embodiment of the present application, inventor also can according to the demand of oneself a setting steps S403 or only setting steps S405 in the embodiment of the present application simultaneously.
As can be seen here, a kind of gas concentration detection method that the embodiment of the present application provides, refinement has been carried out on the basis of embodiment one, and the gas concentration detection mode that the embodiment of the present application is provided is more detailed, clear.
Embodiment three
A kind of gas concentration detection apparatus that Fig. 5 provides for the embodiment of the present application three, as shown in Figure 5, this device comprises: the first fitting unit 1, first acquiring unit 2, second fitting unit 3, second acquisition unit 4 and computing unit 5.
Wherein, the second fitting unit 3 is connected with the first acquiring unit 2, and computing unit 5 is connected with the second fitting unit 3 with the first acquiring unit 2, second acquisition unit 4 respectively.
First fitting unit 1 is for the absorption coefficient curve under matching different temperatures pressure conditions.In the embodiment of the present application, the first fitting unit 1 can basis
absorption coefficient curve under matching different temperatures pressure conditions, wherein, S (T) is line strength of absorption line,
it is absorption line linear function.
Absorption coefficient spectral line line style
wherein, P is the general power of radiation spectral line, the power that P (v) is radiation spectral line frequency when being v in cell frequency interval.
First acquiring unit 2 is for obtaining the pressure detected value of gas to be measured.In the embodiment of the present application, the first acquiring unit 2 can be pressure transducer.Now, the pressure values of gas to be measured directly measured in real time by pressure transducer, using the pressure values that records as pressure detected value.
In actual mechanical process, may because the surveying instrument fault etc. such as extraneous factor interference or pressure transducer causes the pressure detected value of acquisition inaccurate.In order to improve the accuracy of the pressure detected value of acquisition, the embodiment of the present application provides a kind of first acquiring unit.
The detailed construction schematic diagram of a kind of first acquiring unit that Fig. 6 provides for the embodiment of the present application three, this first acquiring unit comprises: pressure detecting unit 21, first computing unit 22, pressure judging unit 23, second computing unit 24 and pressure determining unit 25.
Wherein, the first computing unit 22 is connected with pressure detecting unit 21; Pressure judging unit 23 is connected with the first computing unit 22; Second computing unit 24 is connected with pressure judging unit 23; Pressure determining unit 25 is connected with the second computing unit 24.
Pressure detecting unit 21 is mainly used for detecting in real time the pressure values of gas to be measured.In the embodiment of the present application, this pressure detecting unit 21 can be pressure transducer.
First computing unit 22 is connected with pressure detecting unit 21, and the first computing unit 22 receives the pressure values that pressure detecting unit 21 sends, and calculates the difference of the pressure values that adjacent twice detection obtains.
Pressure judging unit 23 is connected with the first computing unit 22, the difference of the pressure values that adjacent twice detection that pressure judging unit 23 receives the first computing unit 22 transmission obtains, and judges the size of this difference and preset difference value, obtains judged result.
Second computing unit 24 is connected with the first judging unit 23, the second computing unit 24 be used for reception first judging unit 23 send judged result, when difference is less than preset difference value, calculate the average of the pressure values that adjacent twice detection obtains.
Pressure determining unit 25 is connected with the second computing unit 24, and the average of the pressure values sent by the second computing unit 24 received is defined as pressure detected value.
Second fitting unit 3 is connected with the first acquiring unit 2, the pressure detected value that second fitting unit 3 sends according to the first acquiring unit 2, and according to the curve of the absorption coefficient second derivative under all temperature pressure conditions in the pressure range of pressure detected value matching pressure detected value place or toroidal function.
The detailed construction schematic diagram of a kind of second fitting unit that Fig. 7 provides for the embodiment of the present application three.As shown in Figure 7, the second fitting unit comprises: judging unit 31 sum functions determining unit 32.
Wherein, judging unit 31 is connected with the first acquiring unit 2, and one end of function determining unit 32 is connected with judging unit 31, and the other end is connected with the first fitting unit 1.
Judging unit 31 is connected with the first acquiring unit 2, for judging the pressure detected value that the first acquiring unit 2 sends is positioned at whether be positioned at the low pressure range pre-set or the high pressure range pre-set.
One end of function determining unit 32 is connected with judging unit 31, and the other end is connected with the first fitting unit 1, for when pressure detected value is positioned at the low pressure range pre-set, determines that the curvilinear function of absorption coefficient second derivative is:
f(x)=-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value.
When pressure detected value is positioned at the high pressure range pre-set, function determining unit 32 determines that the toroidal function of absorption coefficient second derivative is:
f(x)=-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
Second acquisition unit 4 is for obtaining the temperature detection value of gas to be measured.In the embodiment of the present application, second acquisition unit 4 can be temperature sensor.Now, the temperature value of gas to be measured directly measured in real time by temperature sensor, using the temperature value that records as temperature detection value.
In actual mechanical process, may because the surveying instrument fault etc. such as extraneous factor interference or temperature sensor causes the temperature detection value of acquisition inaccurate.In order to improve the accuracy of the temperature detection value of acquisition, the embodiment of the present application provides a kind of second acquisition unit.
The detailed construction schematic diagram of a kind of first acquiring unit that Fig. 8 provides for the embodiment of the present application three, this first acquiring unit comprises: temperature detecting unit 41, the 3rd computing unit 42, temperature judging unit 43, the 4th computing unit 44 and temperature determining unit 45.
Wherein, the 3rd computing unit 42 is connected with temperature detecting unit 41; Temperature judging unit 43 is connected with the 3rd computing unit 42; 4th computing unit 44 is connected with temperature judging unit 43; Temperature determining unit 45 is connected with the 4th computing unit 44.
Temperature detecting unit 41 is mainly used for detecting in real time the temperature value of gas to be measured.In the embodiment of the present application, this temperature detecting unit 41 can be temperature sensor.
3rd computing unit 42 is connected with temperature detecting unit 41, and the 3rd computing unit 42 receives the temperature value that temperature detecting unit 41 sends, and calculates the difference of the temperature value that adjacent twice detection obtains.
Temperature judging unit 43 is connected with the 3rd computing unit 42, the difference of the temperature value that adjacent twice detection that temperature judging unit 43 receives the 3rd computing unit 42 transmission obtains, and judges the size of this difference and preset difference value, obtains judged result.
4th computing unit 44 is connected with the 3rd judging unit 43, the 4th computing unit 44 be used for reception the 3rd judging unit 43 send judged result, when difference is less than preset difference value, calculate the average of the temperature value that adjacent twice detection obtains.
Temperature determining unit 45 is connected with the 4th computing unit 44, and the average of the temperature value sent by the 4th computing unit 44 received is defined as temperature detection value.
Computing unit 5 is connected with the first acquiring unit 2, second acquisition unit 4 sum functions determining unit 32 respectively, for the gas concentration of accounting temperature detected value and gas to be measured corresponding to pressure detected value.
The detailed construction schematic diagram of a kind of computing unit that Fig. 9 provides for the embodiment of the present application three.As shown in Figure 9, computing unit comprises: derivative calculations unit 51, expression formula computing unit 52, acquiring unit 53 and gas concentration computing unit 54.
Wherein, derivative calculations unit 51 is connected with the first acquiring unit 2, second acquisition unit 4 sum functions determining unit 32 respectively, acquiring unit 53 is for obtaining the second harmonic maximal value of gas to be measured, and gas concentration calculates unit 54 and is connected with second acquisition unit 4 with derivative calculations unit 51, expression formula computing unit 52, acquiring unit 53 respectively.
Derivative calculations unit 51 is connected with the first acquiring unit 2, second acquisition unit 4 sum functions determining unit 32 respectively, derivative calculations unit 51 utilizes temperature detection value and pressure detected value, in conjunction with curve or the toroidal function of absorption coefficient second derivative, determine the absorption coefficient spectral line line style second derivative maximal value of gas to be measured.
The Main Function of expression formula computing unit 52 calculates gas concentration expression formula according to known gas concentration expression formula.
The Main Function of acquiring unit 53 is the second harmonic maximal values obtaining gas to be measured.
Gas concentration calculate unit 54 respectively with derivative calculations unit 51, expression formula computing unit 52, acquiring unit 53 is connected with second acquisition unit 4, gas concentration calculates the concentration that unit 54 utilizes known marked gas, the pressure of known marked gas, the second harmonic maximal value of known marked gas, the absorption coefficient spectral line line style second derivative maximal value of known marked gas, the pressure of gas to be measured, the second harmonic maximal value of gas to be measured and the absorption coefficient spectral line line style second derivative maximal value of gas to be measured, in conjunction with the gas concentration of gas concentration expression formula accounting temperature detected value and gas to be measured corresponding to pressure detected value.
As can be seen here, a kind of gas concentration detection apparatus that the embodiment of the present application provides, this device comprises: the first acquiring unit, second acquisition unit, first fitting unit, second fitting unit and computing unit, wherein, first fitting unit is used for the absorption coefficient curve under matching different temperatures pressure conditions, first acquiring unit and second acquisition unit are used for obtaining pressure detected value and the temperature detection value of gas to be measured respectively, second fitting unit is according to the curve of the absorption coefficient second derivative under all temperature pressure conditions in the pressure range of pressure detected value matching pressure detected value place or toroidal function, finally by the gas concentration of computing unit in conjunction with known gas concentration expression formula accounting temperature detected value and gas to be measured corresponding to pressure detected value, make when measuring the gas concentration of gas to be measured, temperature pressure compensation is carried out to gas concentration algorithm, thus ensure the measuring accuracy of gas concentration.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.
Below be only the preferred implementation of the application, those skilled in the art understood or realizes the application.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (4)
1. a gas concentration detection method, is characterized in that, comprising:
Absorption coefficient curve under matching different temperatures pressure conditions;
Obtain the pressure detected value of gas to be measured;
The curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in matching or toroidal function;
Obtain the temperature detection value of described gas to be measured;
Calculate the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value;
Wherein,
The pressure detected value of described acquisition gas to be measured, comprising:
The pressure values of real-time detection gas to be measured; Calculate the difference of the pressure values that adjacent twice detection obtains; Judge the size of described difference and preset difference value; When difference is less than preset difference value, calculate the average of the pressure values that adjacent twice detection obtains; Described average is defined as the pressure detected value of gas to be measured;
Absorption coefficient curve under described matching different temperatures pressure conditions, comprising:
According to
absorption coefficient curve under matching different temperatures pressure conditions, wherein,
Described α (v) is absorption coefficient, and described v is radiation spectral line frequency, described v
0be the centre frequency of radiation spectral line, described S (T) is line strength of absorption line, described in
it is absorption line linear function;
Described
wherein, described P is the general power of radiation spectral line, the power that described P (v) is radiation spectral line frequency when being v in cell frequency interval;
The curve of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in described matching or toroidal function, comprising:
Judge whether described pressure detected value is positioned at the low pressure range pre-set or the high pressure range pre-set;
When the low pressure range pre-set described in described pressure detected value is positioned at, determine that the curvilinear function of described absorption coefficient second derivative is:
f(x)＝-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value;
When the high pressure range pre-set described in described pressure detected value is positioned at, determine that the toroidal function of described absorption coefficient second derivative is:
f(x)＝-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
2. method according to claim 1, is characterized in that, the gas concentration of the described temperature detection value of described calculating and gas described to be measured corresponding to described pressure detected value, comprising:
Utilize described temperature detection value and described pressure detected value, in conjunction with curve or the toroidal function of described absorption coefficient second derivative, determine the absorption coefficient spectral line line style second derivative maximal value of described gas to be measured;
Gas concentration expression formula is calculated according to known gas concentration expression formula;
Wherein, known gas concentration expression formula is:
wherein, C is gas concentration, σ
vmodulating frequency,
second harmonic maximal value, F
2maxfor absorption coefficient spectral line line style second derivative maximal value, P is the pressure of gas to be measured, and L is total optical path, I
0for incident light radiation intensity;
Gas concentration expression formula is:
wherein, C
bfor the concentration of gas to be measured, C
afor the concentration of marked gas, P
afor the pressure of marked gas,
for the second harmonic maximal value of marked gas,
for the absorption coefficient spectral line line style second derivative maximal value of marked gas, P
bfor the pressure of gas to be measured,
for the second harmonic maximal value of gas to be measured, F
b2maxfor the absorption coefficient spectral line line style second derivative maximal value of gas to be measured;
Obtain the second harmonic maximal value of described gas to be measured;
Utilize the absorption coefficient spectral line line style second derivative maximal value of the absorption coefficient spectral line line style second derivative maximal value of the second harmonic maximal value of the pressure of the concentration of known marked gas, known marked gas, known marked gas, known marked gas, the pressure of described gas to be measured, the second harmonic maximal value of described gas to be measured and described gas to be measured, calculate the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value in conjunction with gas concentration expression formula.
3. a gas concentration detection apparatus, is characterized in that, comprises the first fitting unit, the first acquiring unit, the second fitting unit, second acquisition unit, computing unit, wherein,
Described first fitting unit is used for the absorption coefficient curve under matching different temperatures pressure conditions;
Described first acquiring unit is for obtaining the pressure detected value of gas to be measured; Comprise: the pressure values detecting gas to be measured in real time; Calculate the difference of the pressure values that adjacent twice detection obtains; Judge the size of described difference and preset difference value; When difference is less than preset difference value, calculate the average of the pressure values that adjacent twice detection obtains; Described average is defined as the pressure detected value of gas to be measured;
Described second fitting unit is connected with described first acquiring unit, for curve or the toroidal function of the absorption coefficient second derivative under all temperature pressure conditions in pressure detected value place pressure range described in matching;
Described second acquisition unit is for obtaining the temperature detection value of described gas to be measured;
Described computing unit is connected with described second fitting unit with described first acquiring unit, described second acquisition unit respectively, for calculating the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value;
Wherein,
Described second fitting unit comprises: judging unit sum functions determining unit, wherein,
Described judging unit is connected with described first acquiring unit, for judging whether described pressure detected value is positioned at the low pressure range pre-set or the high pressure range pre-set;
One end of described function determining unit is connected with described first fitting unit, and the other end is connected with described judging unit, when the low pressure range pre-set described in described pressure detected value is positioned at, determines that the curvilinear function of described absorption coefficient second derivative is:
f(x)＝-2.871×10
-9x
6+8.104×10
-6x
5-0.009635x
4+6.235x
3-2335x
2+5.094×10
5x
-5.388 × 10
7, wherein, x is temperature value;
When the high pressure range pre-set described in described pressure detected value is positioned at, determine that the toroidal function of described absorption coefficient second derivative is:
f(x)＝-92.76x
2+29.05x
2 2+30.97x
1 2x
2 2-48.27x
1x
2 2+0.14x
2 3-0.04x
1 3x
2 3-0.24x
1x
2 3+23.96x
1 3x
2
+0.16x
1 2x
2 3-8.95x
1 3x
2 2-0.00006x
2 4-0.000002x
1 4x
2 4+0.000099x
1x
2 4-7.04x
2x
1 4
-0.000063x
1 2x
2 4+ 0.99x
1 4x
2 2+ 0.000018x
1 3x
2 4+ 0.0046x
1 4x
2 3, wherein, x
1for pressure values, x
2for temperature value.
4. device according to claim 3, is characterized in that, described computing unit comprises: derivative calculations unit, expression formula computing unit, acquiring unit and gas concentration computing unit, wherein,
Described derivative calculations unit is connected with described first acquiring unit, second acquisition unit sum functions determining unit respectively, for utilizing described temperature detection value and described pressure detected value, in conjunction with curve or the toroidal function of described absorption coefficient second derivative, determine the absorption coefficient spectral line line style second derivative maximal value of described gas to be measured;
Expression formula computing unit is used for calculating gas concentration expression formula according to known gas concentration expression formula;
Wherein, known gas concentration expression formula is:
wherein, C is gas concentration, σ
vmodulating frequency,
second harmonic maximal value, F
2maxfor absorption coefficient spectral line line style second derivative maximal value, P is the pressure of gas to be measured, and L is total optical path, I
0for incident light radiation intensity;
Gas concentration expression formula is:
wherein, C
bfor the concentration of gas to be measured, C
afor the concentration of marked gas, P
afor the pressure of marked gas,
for the second harmonic maximal value of marked gas, F
a2maxfor the absorption coefficient spectral line line style second derivative maximal value of marked gas, P
bfor the pressure of gas to be measured,
for the second harmonic maximal value of gas to be measured, F
b2maxfor the absorption coefficient spectral line line style second derivative maximal value of gas to be measured;
Described acquiring unit is for obtaining the second harmonic maximal value of described gas to be measured;
Described gas concentration calculate unit respectively with derivative calculations unit, expression formula computing unit, acquiring unit is connected with the first acquiring unit, for utilizing the concentration of known marked gas, the pressure of known marked gas, the second harmonic maximal value of known marked gas, the absorption coefficient spectral line line style second derivative maximal value of known marked gas, the pressure of described gas to be measured, the second harmonic maximal value of described gas to be measured and the absorption coefficient spectral line line style second derivative maximal value of described gas to be measured, the gas concentration of described temperature detection value and gas described to be measured corresponding to described pressure detected value is calculated in conjunction with described gas concentration expression formula.
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