CN112858472B - Method and system for correcting gas detection error by utilizing temperature - Google Patents
Method and system for correcting gas detection error by utilizing temperature Download PDFInfo
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- CN112858472B CN112858472B CN201911193847.5A CN201911193847A CN112858472B CN 112858472 B CN112858472 B CN 112858472B CN 201911193847 A CN201911193847 A CN 201911193847A CN 112858472 B CN112858472 B CN 112858472B
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Abstract
The invention discloses a method and a system for correcting gas detection errors by utilizing temperature, belongs to the technical field of mixed gas detection, and solves the problem of larger errors in detecting mixed gas components and concentration caused by larger errors in measured sound velocity. The method for correcting gas detection errors by utilizing temperature detects the ambient temperature of mixed gas, subtracts the actual ambient temperature from the detected ambient temperature to obtain a relative temperature error by calculation, and if the absolute value of the relative temperature error is larger than an error set value, the sound velocity of the mixed gas is erroneously adjusted according to the relative temperature to obtain an adjusted sound velocity and obtain a sound velocity inflection point; and (3) recalculating according to the sound velocity inflection point to obtain a relative temperature error, if the absolute value of the relative temperature error is larger than an error set value, recalculating to obtain the sound velocity inflection point, otherwise, obtaining the concentration of the mixed gas by using the sound velocity inflection point obtained by the last calculation. The error of the measured sound velocity is corrected, and the detection accuracy of the mixed gas components and the concentration is improved.
Description
Technical Field
The invention relates to the technical field of mixed gas detection, in particular to a method and a system for correcting gas detection errors by utilizing temperature.
Background
The existing gas sensing technology method in the market is many, the service life of the chemical reaction method is short, the applicable scene of the semiconductor method is single, the sensitivity is greatly changed by environmental temperature and humidity, calibration is often needed, the spectral method has high requirements on technology and equipment, and the cost is high, wherein the acoustic relaxation-based acoustic velocity spectrum inflection point positioning detection gas is an emerging gas sensing technology method, the principle is that a sound velocity spectrum curve is constructed by using measured acoustic velocity values, further, the acoustic velocity spectrum inflection point is calculated, the type and concentration of the mixed gas are detected by using the inflection point position, however, the problem that the error of the detected mixed gas component and concentration is larger due to larger error of the measured acoustic velocity is not solved well all the time.
Disclosure of Invention
The present invention is directed to a method and system for correcting gas detection errors by using temperature, which at least overcomes the above-mentioned technical shortcomings.
In one aspect, the present invention provides a method for correcting gas detection errors using temperature, comprising the steps of:
step S1, detecting the ambient temperature of the mixed gas, subtracting the actual ambient temperature from the detected ambient temperature, calculating to obtain a relative temperature error, and executing step S2 if the absolute value of the relative temperature error is larger than an error set value;
s2, obtaining a relative measurement error of corrected sound velocity according to the relative temperature error, adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity to obtain an adjusted sound velocity, and calculating a sound velocity inflection point according to the adjusted sound velocity;
and S3, acquiring the ambient temperature of the mixed gas according to the sound velocity inflection point, and recalculating to obtain a relative temperature error according to the acquired ambient temperature and the actual ambient temperature, wherein if the absolute value of the relative temperature error is larger than an error set value, the step S2 is re-executed, otherwise, the concentration of the mixed gas is acquired by the sound velocity inflection point obtained by the last calculation.
Further, obtaining a relative measurement error of the corrected sound velocity according to the relative temperature error specifically includes using a formula
And obtaining a relative measurement error of the corrected sound velocity, wherein DeltaV is the relative measurement error of the corrected sound velocity, deltaT is the absolute value of the relative temperature error, and k is the adjustment parameter.
Further, the method for adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity specifically includes subtracting the relative measurement error of the corrected sound velocity on the sound velocity basis of the mixed gas if the relative temperature error is a positive number, otherwise adding the relative measurement error of the corrected sound velocity on the sound velocity basis of the mixed gas.
On the other hand, the invention also provides a system for correcting the gas detection error by utilizing the temperature, which comprises a relative temperature error acquisition module, a sound velocity adjustment and sound velocity inflection point acquisition module and a continuous correction control module;
the relative temperature error acquisition module is used for detecting the ambient temperature of the mixed gas, subtracting the actual ambient temperature from the detected ambient temperature, and calculating to obtain a relative temperature error;
the sound speed adjusting and sound speed inflection point obtaining module is used for obtaining a relative measurement error of corrected sound speed according to the relative temperature error when the absolute value of the relative temperature error is larger than an error set value, adjusting the sound speed of the mixed gas by utilizing the relative measurement error of the corrected sound speed to obtain an adjusted sound speed, and calculating the sound speed inflection point according to the adjusted sound speed;
the continuous correction control module is used for obtaining the ambient temperature of the mixed gas according to the sound velocity inflection point, recalculating the obtained relative temperature error according to the obtained ambient temperature and the actual ambient temperature, controlling the sound velocity adjustment and sound velocity inflection point obtaining module to recalculate the obtained sound velocity inflection point when the absolute value of the relative temperature error is larger than the error set value, recalculating the obtained relative temperature error until the absolute value of the relative temperature error is equal to or smaller than the error set value, and obtaining the concentration of the mixed gas by the sound velocity inflection point obtained by the last calculation.
Further, the relative temperature error obtaining module obtains a relative measurement error of the corrected sound velocity according to the relative temperature error, specifically including using a formula
And obtaining a relative measurement error of the corrected sound velocity, wherein DeltaV is the relative measurement error of the corrected sound velocity, deltaT is the absolute value of the relative temperature error, and k is the adjustment parameter.
Further, the sound speed adjusting and inflection point obtaining module adjusts the sound speed of the mixed gas by using the relative measurement error of the corrected sound speed, specifically including subtracting the relative measurement error of the corrected sound speed on the sound speed basis of the mixed gas if the relative temperature error is a positive number, otherwise adding the relative measurement error of the corrected sound speed on the sound speed basis of the mixed gas.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps of detecting the ambient temperature of mixed gas, subtracting the actual ambient temperature from the detected ambient temperature, calculating to obtain a relative temperature error, obtaining a relative measurement error of corrected sound velocity according to the relative temperature error if the absolute value of the relative temperature error is larger than an error set value, adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity to obtain an adjusted sound velocity, and calculating to obtain a sound velocity inflection point according to the adjusted sound velocity; and acquiring the ambient temperature of the mixed gas according to the sound velocity inflection point, recalculating to obtain a relative temperature error according to the acquired ambient temperature and the actual ambient temperature, and recalculating to obtain the sound velocity inflection point if the absolute value of the relative temperature error is larger than an error set value, otherwise, acquiring the concentration of the mixed gas by using the sound velocity inflection point obtained by the last calculation. The error of the measured sound velocity is corrected, and the detection accuracy of the mixed gas components and the concentration is improved.
Drawings
FIG. 1 is a flow chart of a method for correcting gas detection errors using temperature according to embodiment 1 of the present invention;
FIG. 2 is a sound velocity spectrum according to example 1 of the present invention;
FIG. 3 is a schematic diagram of an effective detection region constructed using inflection points of sound velocity spectrum according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of the determination of the composition of a mixed gas using the inflection point of sound velocity according to embodiment 1 of the present invention;
FIGS. 5-7 are V described in example 1 of the present invention 1 With errors, V 2 With errors or V 3 A change schematic diagram of the position of the inflection point of the synthesized sound velocity spectrum along with sound velocity values of three frequency points under the condition of errors;
FIG. 8 is a schematic diagram of the sound velocity spectrum line and the measured sound velocity value under the condition of a sound velocity measurement error according to the embodiment 1 of the present invention;
FIG. 9 is a plot of inflection points of a corrected sound velocity spectrum for one sound velocity measurement error according to example 1 of the present invention;
FIG. 10 is a schematic diagram of the sound velocity spectrum line and the measured sound velocity values for the case of two sound velocity measurement errors according to example 1 of the present invention;
fig. 11 is a trajectory of inflection points of sound velocity spectra corrected in the case of two sound velocity measurement errors according to embodiment 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment of the invention provides a method for correcting gas detection errors by utilizing temperature, which comprises the following steps:
step S1, detecting the ambient temperature of the mixed gas, subtracting the actual ambient temperature from the detected ambient temperature, calculating to obtain a relative temperature error, and executing step S2 if the absolute value of the relative temperature error is larger than an error set value;
s2, obtaining a relative measurement error of corrected sound velocity according to the relative temperature error, adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity to obtain an adjusted sound velocity, and calculating a sound velocity inflection point according to the adjusted sound velocity;
and S3, acquiring the ambient temperature of the mixed gas according to the sound velocity inflection point, and recalculating to obtain a relative temperature error according to the acquired ambient temperature and the actual ambient temperature, wherein if the absolute value of the relative temperature error is larger than an error set value, the step S2 is re-executed, otherwise, the concentration of the mixed gas is acquired by the sound velocity inflection point obtained by the last calculation.
The method comprises the steps of detecting the ambient temperature of the mixed gas, obtaining coordinates of a sound velocity inflection point according to the prior art, subtracting the coordinates of the sound velocity inflection point from data of a detection area, finding data with the minimum distance, and then using a temperature value corresponding to the data with the minimum distance as the ambient temperature of the mixed gas; measuring the actual ambient temperature with a high-precision thermometer; the relative error set point can be set as desired, with a preferred value of between 0.02% and 0.4%.
In particular, a sonic spectrum of multiple vibratory relaxation including a single relaxation process may be expressed as
From the above equation, a multi-relaxation process sonic spectrum with N single relaxation processes can be obtained with V of 2N+1 parameters 2 (∞),ε i And τ i (1.ltoreq.i.ltoreq.N), thus V 2 (∞),ε i And τ i The values required for sound velocity spectrum reconstruction can be captured by measuring sound velocity values at 2n+1 frequencies, and for most gases, the relaxation of the gas only presents a significant main relaxation process, so that the sound velocity spectrum of most gases can be constructed by measuring sound velocity at three different frequency points; constructing a sound velocity spectrum using sound velocities measured at three frequency points, the sound velocity spectrum, as shown in fig. 2, showing sound velocity spectra (black curves) and sound velocity spectrum inflection points (square points) constructed using sound velocities measured at three frequency points (square points) in fig. 2; the three frequency points are 4.167kHz, 40kHz and 500kHz, and the corresponding sound velocity measurement values are V respectively 1 ＝278.55m/s，V 2 = 283.33m/s and V 3 =290.0m/s (represented by box dots); substituting the sound velocity measurement values of the three frequency points into the sound velocity spectrum reconstruction formula in the formula to obtain three equations, and finally calculating the sound velocity spectrum inflection point (f m ＝46.777kHz，V m = 284.28 m/s), as shown by square dots in fig. 2;
the inflection point of the sound velocity spectrum is a special point on the sound velocity spectrum line, and the frequency f of the inflection point of the sound velocity spectrum m The sound velocity value V of the frequency corresponding to the peak point of the sound absorption spectrum m The expression of (c) is as follows,
wherein V is 2 (0) And V 2 (+.infinity) is the maximum and minimum of the sound velocity line square, V (V) 2 (0) And V 2 The expression of "(≡) is as follows,
wherein, the liquid crystal display device comprises a liquid crystal display device,is the effective isobaric heat capacity of the external degree of freedom of the mixed gas; />The inflection point of the sound velocity spectrum of the red square point on fig. 2 is calculated by using the formulas (1) (2) (3) representing the sum of effective isobaric heat capacities of the external and internal degrees of freedom;
the main relaxation characteristic of the sound velocity spectrum can be represented by a sound velocity spectrum inflection point, which is a special point on the sound velocity spectrum curve, has uniqueness on a monotonically rising S-shaped curve, and has a frequency f m The frequency is the same as the frequency of the peak point of the sound absorption spectrum, and is the effective relaxation frequency, and the sound velocity value V of the inflection point of the sound velocity spectrum m Sum V only 2 (0)、V 2 The sum of two fixed values (++) is related, and V is 2 (0) And V 2 (+.infinity) reflects mainly the energy consumption of molecular relaxation, thus, the first and second substrates are bonded together, the inflection point of sound velocity spectrum as characteristic value can be used for detecting gasThe composition, the schematic diagram of the effective detection area constructed by utilizing the inflection point of the sound velocity spectrum, as shown in fig. 3, is that the composition of the mixed gas is judged by utilizing the inflection point of the sound velocity, as shown in fig. 4, and the composition of the gas is judged to be 86.9% CO2-13.1% N2;
therefore, the position of the inflection point of the sound velocity spectrum determines the accuracy of the gas sensing method, in one embodiment, it is assumed that the measurement error of the sound velocity occurs at one of three fixed frequency points, and the sound velocity measurement values of the other two frequency points are correct, and fig. 5 to 7 are respectively V in embodiment 1 of the present invention 1 With errors, V 2 With errors or V 3 A change schematic diagram of the position of the inflection point of the synthesized sound velocity spectrum along with sound velocity values of three frequency points under the condition of errors; in fig. 5 to 7, the solid line represents a sound velocity spectrum curve reconstructed with theoretical sound velocity values, the broken line represents a sound velocity spectrum curve constructed with the sound velocity measurement values with errors, the symbol "+." represents a synthesized sound velocity spectrum inflection point, and "+.;
FIGS. 5-7 show three frequency points f of the reconstructed sound velocity spectrum 1 ＝4.667kHz，f 2 ＝40KHz，f 3 When the value of the sound velocity is positive and negative, namely the value of the sound velocity is 500kHz, and the corresponding theoretical sound velocity value has positive and negative errors, the inflection point of the corresponding sound velocity changes; as can be seen from fig. 5, the position of the inflection point of the obtained sound velocity spectrum follows the sound velocity value V 1 Gradually increases from left to right with the sound velocity value V 1 Is gradually decreased by the decrease in (a). A larger sound velocity value V 1 Sound velocity value V resulting in a large sound velocity spectrum inflection point m Likewise, FIG. 7 sound velocity value V 3 Sound velocity V of change of (V) versus inflection point of sound velocity spectrum m Influence of (V) and V 1 In agreement, contrary to this, FIG. 6 shows a graph with V 2 Increasing or decreasing the sound velocity value V of the inflection point of the sound velocity spectrum m The corresponding frequency fluctuates around the theoretical value and the large sound velocity value V 2 Sound velocity value V leading to inflection point of sound velocity spectrum m The frequency becomes smaller, small sound velocity value V 2 Sound velocity value V leading to inflection point of sound velocity spectrum m The frequency becomes large;
the reason for this phenomenon that the sound velocity value of the inflection point of the sound velocity spectrum of fig. 6 remains unchanged is that the sound velocity value of the inflection point of the sound velocity spectrum depends only on soundSound velocity value V of limit frequency point of velocity spectrum 2 (∞)、V 2 (0) Sum of the sound velocity value V 2 Is independent of the size of (a).
According to the relation between speed and temperatureAnd the relationship between gas concentration and temperature and measured sound velocity error in FIGS. 5-7, a function is fitted as a correction factor as follows
Wherein DeltaV is the relative measurement error of the corrected sound velocity, deltaT is the absolute value of the relative temperature error, k is the adjustment parameter, the adjustment parameters of different types of mixed gases are different, the adjustment parameters of the mixed gases are certain, and the value range of k is 500-1500.
Preferably, the relative measurement error of the corrected sound velocity is obtained according to the relative temperature error, specifically including the following steps of using a formula
Obtaining a relative measurement error of the corrected sound velocity, wherein DeltaV is the relative measurement error of the corrected sound velocity, deltaT is the absolute value of the relative temperature error, and k is an adjustment parameter; different types of mixed gas adjustment parameters are different.
Preferably, the adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity specifically includes subtracting the relative measurement error of the corrected sound velocity on the basis of the sound velocity of the mixed gas if the relative temperature error is a positive number, otherwise adding the relative measurement error of the corrected sound velocity on the basis of the sound velocity of the mixed gas.
In a specific embodiment, in the actual measurement of sound velocity of three frequency points, there are three situations, namely, there is a sound velocity measurement error, there are two sound velocity measurement error situations and there are three sound velocity measurement errors; if errors occur in the sound velocity at all three frequency points, the measurement data should be discarded, test equipment and instruments should be detected, and the measurement should be restarted; only the case where there is one sound speed measurement error or two sound speed errors is discussed here; first discussed in
86.9% CO in FIG. 8 2 -13.1％N 2 The experimental data has a sound velocity measurement error; FIG. 8 is a graph of sound velocity spectrum dispersion lines and measured sound velocity values for a sound velocity measurement error; FIG. 9 is a plot of inflection points of a corrected sound velocity spectrum for a sound velocity measurement error; in fig. 8 to 9, the solid line represents a theoretical sound velocity spectrum line, "++" represents a measured sound velocity value, "o" represents a theoretical predicted sound velocity spectrum inflection point location; arrows represent the direction of correcting the sound velocity error;
the sound velocity values measured at the frequencies of 3.125kHz,40kHz and 500kHz are V respectively 1 ＝279.3m/s，V 2 ＝283.3m/s V 3 =290.1 m/s (symbol "+% in fig. 8). The coordinates of the inflection point of the sound velocity spectrum obtained by reconstructing the sound velocity spectrum from these three sound velocity values are (f) m ＝52.66kHz，V m = 284.77 m/s), the distance symbol "o" furthest "is shown in fig. 9; locating the inflection point of the sound velocity spectrum to CO 2 -N 2 An effective detection area for detecting 92.0% CO of the gas mixture component 2 -8％N 2 。
The following is a sound velocity error correction (with a sound velocity measurement error), first, it is assumed that the measurement error is derived from V 1 =279.3 m/s; between the detected temperature 310.6K and the actual ambient temperature 303.15K, the relative temperature error Δt is 2.46%, and the corresponding correction factor (the relative measurement error of the corrected sound velocity) Δv=0.16% is calculated by the correction function formula (the adjustment parameter is 1000). Will V 1 A sound velocity inflection point calculated by using the formulas (1), (2), (3) and (4) with a decrease of 0.016% from 279.3m/s; acquiring the ambient temperature of the mixed gas according to the sound velocity inflection point, and recalculating the relative temperature error according to the acquired ambient temperature and the actual ambient temperature to ensure that V 1 Uninterrupted correction is carried out until deltat is equal to or smaller than an error set value (positive and negative signs are unchanged);
the symbol "Σ" corresponding to fig. 9 reflects the inflection point of sound velocity corresponding to the correction value, and the arrow indicates the correction direction; the final corrected sound velocity inflection point almost coincides with the sound velocity inflection point coordinate' of the theoretical predicted value, and the final result is 86.9% CO 2 -13.1％N 2 The temperature is 303.6K; second, assume that the measurement error comes from V 2 =283.3 m/s and V 3 Symbols "+" and "ζ" in fig. 9, which are taken to be 290.1m/s (although they are the correct measurement results), respectively represent the signals from V 2 And V 3 The inflection point of the sound velocity spectrum reconstructed by temperature correction, the concentration detection result of the mixed gas is shown in table 1,
TABLE 1
As can be seen from Table 1, for a sound velocity measurement error case, our correction method can limit the maximum error to 0.23% (based on CO) even if it is not known which measurement point is in error 2 Relative error in concentration);
in a specific embodiment, considering the case of two acoustic velocity measurement errors, fig. 10 is a schematic diagram of acoustic velocity spectrum lines and measured acoustic velocity values under the case of two acoustic velocity measurement errors, and fig. 11 is a trace of inflection points of a corrected acoustic velocity spectrum under the case of two acoustic velocity measurement errors; in fig. 10 to 11, the solid line represents the theoretical sound velocity spectrum line, "x" represents the measured sound velocity value, "o" represents the theoretical predicted sound velocity spectrum inflection point location; the arrow represents the direction of correcting the sound velocity error
The discussion is made on three experimental values of sound velocity at frequencies 3.125kHz,40kHz,500kHz, corresponding to sound velocity values V 1 ＝283.3m/s，V 2 ＝277.5m/s V 3 = 289.4m/s (symbol "×in fig. 10), the initial detection result is 83.6CO 2 -16.4％N 2 The temperature is 294.4K, and the corresponding sonic spectrum inflection point is shown as the leftmost symbol in fig. 11 "; first, assume that the measurement error comes from V 1 And V 2 The method comprises the steps of carrying out a first treatment on the surface of the Based on the detected temperature 294.4K compared with the actual measured temperature 303.15K, V 1 And V 2 Is increased by DeltaV e The corresponding sonic spectrum inflection point is shown in fig. 11 symbol "; repeating the correction step, the final position of the inflection point of the sound velocity spectrum being (f m ＝46.608kHz，V m = 284.21 m/s), the corresponding detection result is a temperature of 302.9K, a mixed gas of 86.8% co 2 -13.2％N 2 The detection error is 0.12%;
assuming that the measurement error is from V 2 And V 3 The corresponding inflection point of the sound velocity spectrum is shown as the sign "+" in fig. 11, the final correction result is a temperature of 301.9K, and the mixed gas is 87.1% co 2 -12.9％N 2 The detection error is 0.23%; finally, assume that the measurement error comes from V 1 And V 2 The method comprises the steps of carrying out a first treatment on the surface of the The corresponding inflection point of sound velocity spectrum is shown in the symbol 'delta' of FIG. 11, the final correction result is that the temperature is 302.4K, and the mixed gas is 86.9% CO 2 -13.1％N 2 The method comprises the steps of carrying out a first treatment on the surface of the The results of the mixed gas concentration detection are shown in table 2,
TABLE 2
Example 2
The embodiment of the invention provides a system for correcting gas detection errors by utilizing temperature, which comprises a relative temperature error acquisition module, a sound velocity adjustment and sound velocity inflection point acquisition module and a continuous correction control module;
the device comprises a relative temperature error acquisition module, a sound velocity adjustment and sound velocity inflection point acquisition module and a continuous correction control module;
the relative temperature error acquisition module is used for detecting the ambient temperature of the mixed gas, subtracting the actual ambient temperature from the detected ambient temperature, and calculating to obtain a relative temperature error;
the sound speed adjusting and sound speed inflection point obtaining module is used for obtaining a relative measurement error of corrected sound speed according to the relative temperature error when the absolute value of the relative temperature error is larger than an error set value, adjusting the sound speed of the mixed gas by utilizing the relative measurement error of the corrected sound speed to obtain an adjusted sound speed, and calculating the sound speed inflection point according to the adjusted sound speed;
the continuous correction control module is used for obtaining the ambient temperature of the mixed gas according to the sound velocity inflection point, recalculating the obtained relative temperature error according to the obtained ambient temperature and the actual ambient temperature, controlling the sound velocity adjustment and sound velocity inflection point obtaining module to recalculate the obtained sound velocity inflection point when the absolute value of the relative temperature error is larger than the error set value, recalculating the obtained relative temperature error until the absolute value of the relative temperature error is equal to or smaller than the error set value, and obtaining the concentration of the mixed gas by the sound velocity inflection point obtained by the last calculation.
Preferably, the relative temperature error obtaining module obtains a relative measurement error of the corrected sound velocity according to the relative temperature error, specifically including using a formula
The relative measurement error of the corrected sound velocity is obtained, deltaV is the relative measurement error of the corrected sound velocity, deltaT is the absolute value of the relative temperature error, k is the adjustment parameter, and the adjustment parameters of different types of mixed gas are different.
Preferably, the sound velocity adjusting and inflection point obtaining module adjusts the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity, and specifically includes subtracting the relative measurement error of the corrected sound velocity on the basis of the sound velocity of the mixed gas if the relative temperature error is a positive number, otherwise adding the relative measurement error of the corrected sound velocity on the basis of the sound velocity of the mixed gas.
The invention discloses a method and a system for correcting gas detection errors by utilizing temperature, wherein the method comprises the steps of detecting the ambient temperature of mixed gas, subtracting the actual ambient temperature from the detected ambient temperature to obtain a relative temperature error, if the absolute value of the relative temperature error is larger than an error set value, obtaining a relative measurement error of corrected sound velocity according to the relative temperature error, adjusting the sound velocity of the mixed gas by utilizing the relative measurement error of corrected sound velocity to obtain an adjusted sound velocity, and calculating to obtain a sound velocity inflection point according to the adjusted sound velocity; and acquiring the ambient temperature of the mixed gas according to the sound velocity inflection point, recalculating to obtain a relative temperature error according to the acquired ambient temperature and the actual ambient temperature, and recalculating to obtain the sound velocity inflection point if the absolute value of the relative temperature error is larger than an error set value, otherwise, acquiring the concentration of the mixed gas by using the sound velocity inflection point obtained by the last calculation. The error of the measured sound velocity is corrected, and the detection accuracy of the mixed gas components and the concentration is improved.
It should be noted that, where the descriptions of embodiment 1 and embodiment 2 are not repeated, they can be used as references to each other.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (2)
1. A method for correcting gas detection errors using temperature, comprising the steps of:
step S1, detecting the ambient temperature of the mixed gas, subtracting the actual ambient temperature from the detected ambient temperature, calculating to obtain a relative temperature error, and if the absolute value of the relative temperature error is larger than an error set value, executing step S2, wherein the detecting the ambient temperature of the mixed gas comprises the following steps: acquiring coordinates of a sound velocity inflection point, subtracting the coordinates of the sound velocity inflection point from data of a detection area, finding data with the minimum distance, and taking a temperature value corresponding to the data with the minimum distance as the ambient temperature of the mixed gas obtained by detection;
s2, obtaining a relative measurement error of corrected sound velocity according to the relative temperature error, adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity to obtain an adjusted sound velocity, and calculating a sound velocity inflection point according to the adjusted sound velocity;
step S3, acquiring the ambient temperature of the mixed gas according to the sound velocity inflection point, and recalculating to obtain a relative temperature error according to the acquired ambient temperature and the actual ambient temperature, if the absolute value of the relative temperature error is larger than an error set value, re-executing step S2, otherwise, acquiring the concentration of the mixed gas by using the sound velocity inflection point obtained by the last calculation;
obtaining a relative measurement error of the corrected sound velocity according to the relative temperature error, which concretely comprises the following steps of using a formula
A relative measurement error of the corrected sound velocity is obtained, wherein,to correct the relative measurement error of the speed of sound, +.>Absolute value of relative temperature error, +.>To adjust parameters;
and adjusting the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity, wherein the method specifically comprises the steps of subtracting the relative measurement error of the corrected sound velocity on the sound velocity basis of the mixed gas if the relative temperature error is positive, otherwise adding the relative measurement error of the corrected sound velocity on the sound velocity basis of the mixed gas.
2. The system for correcting the gas detection error by utilizing the temperature is characterized by comprising a relative temperature error acquisition module, a sound velocity adjustment and sound velocity inflection point acquisition module and a continuous correction control module;
the relative temperature error obtaining module is configured to detect an ambient temperature of the mixed gas, subtract an actual ambient temperature from the detected ambient temperature, and calculate a relative temperature error, where detecting the ambient temperature of the mixed gas includes: acquiring coordinates of a sound velocity inflection point, subtracting the coordinates of the sound velocity inflection point from data of a detection area, finding data with the minimum distance, and taking a temperature value corresponding to the data with the minimum distance as the ambient temperature of the mixed gas obtained by detection;
the sound speed adjusting and sound speed inflection point obtaining module is used for obtaining a relative measurement error of corrected sound speed according to the relative temperature error when the absolute value of the relative temperature error is larger than an error set value, adjusting the sound speed of the mixed gas by utilizing the relative measurement error of the corrected sound speed to obtain an adjusted sound speed, and calculating the sound speed inflection point according to the adjusted sound speed;
the continuous correction control module is used for obtaining the ambient temperature of the mixed gas according to the sound velocity inflection point, recalculating the obtained relative temperature error according to the obtained ambient temperature and the actual ambient temperature, controlling the sound velocity adjustment and sound velocity inflection point obtaining module to recalculate the obtained sound velocity inflection point when the absolute value of the relative temperature error is larger than an error set value, recalculating the obtained relative temperature error until the absolute value of the relative temperature error is equal to or smaller than the error set value, and obtaining the concentration of the mixed gas by the sound velocity inflection point obtained by the last calculation;
the relative temperature error obtaining module obtains a relative measurement error of corrected sound velocity according to the relative temperature error, specifically including using a formula
A relative measurement error of the corrected sound velocity is obtained, wherein,to correct the relative measurement error of the speed of sound, +.>Absolute value of relative temperature error, +.>To adjust parameters;
the sound velocity adjusting and sound velocity inflection point obtaining module adjusts the sound velocity of the mixed gas by using the relative measurement error of the corrected sound velocity, and specifically includes subtracting the relative measurement error of the corrected sound velocity on the sound velocity basis of the mixed gas if the relative temperature error is a positive number, otherwise adding the relative measurement error of the corrected sound velocity on the sound velocity basis of the mixed gas.
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Citations (3)
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| JPH05281207A (en) * | 1992-03-31 | 1993-10-29 | Japan Tobacco Inc | Calibration method of concentration measuring apparatus in salt-making plant |
| CN108645910A (en) * | 2018-06-04 | 2018-10-12 | 华中科技大学 | A method of the inflection point the detection of gas compositions based on velocity of sound spectral line |
| CN110161115A (en) * | 2019-05-23 | 2019-08-23 | 华中科技大学 | A kind of gas componant detection method and system based on velocity of sound frequency dispersion change rate of strength |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05281207A (en) * | 1992-03-31 | 1993-10-29 | Japan Tobacco Inc | Calibration method of concentration measuring apparatus in salt-making plant |
| CN108645910A (en) * | 2018-06-04 | 2018-10-12 | 华中科技大学 | A method of the inflection point the detection of gas compositions based on velocity of sound spectral line |
| CN110161115A (en) * | 2019-05-23 | 2019-08-23 | 华中科技大学 | A kind of gas componant detection method and system based on velocity of sound frequency dispersion change rate of strength |
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