CN114324211A - Processing method of laser measurement signal and multi-wavelength laser measurement system - Google Patents
Processing method of laser measurement signal and multi-wavelength laser measurement system Download PDFInfo
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Abstract
The embodiment of the invention discloses a processing method of a laser measurement signal and a multi-wavelength laser measurement system, wherein the method comprises the following steps: step 1: sequentially emitting a first wavelength lambda to the atmosphere to be measured1A second wavelength lambda2The measuring laser of (1); wherein the ratio of absorption peak to absorption intensity of the absorption peak of the measuring laser is A1：A2The influence of the aerosol on the measurement laser is set as B1、B2(ii) a Step 2: obtaining a concentration measurement S of a measurement laser1、S2Ambient temperature value T of the atmosphere to be measured, absorption coefficient value Ks of the measurement laser at the measurement wavelength1(T)、Ks2(T); and step 3: respectively constructing functions between the actual concentration C of the atmosphere to be measured and the actual concentrations B1 and B2; and 4, step 4: and calculating the actual concentration value of the atmosphere to be measured according to the two constructed functions. The technical scheme of the invention provides common-mode aerosol spectrum interference resistance and establishes multiple wavelengthsThe measurement system deducts the common mode influence interference of the aerosol, improves the measurement precision and meets the requirements of humidity and other gas measurement precision under complex working conditions.
Description
Technical Field
The embodiment of the invention relates to the field of gas sensors, in particular to a processing method of a laser measurement signal and a multi-wavelength laser measurement system.
Background
At present, the gas sensor has various measuring principles and measuring forms, and more commonly comprises an optical sensor, an electrochemical sensor, a catalytic combustion sensor and the like, wherein the optical sensor adopts gas absorption spectrum to carry out tests, including ultraviolet difference and infrared absorption, wherein the infrared absorption comprises TDLAS and NDIR technologies. It is possible to implement TDLAS-only technology that requires accurate determination of complex gas components in environmentally friendly, industrial processes without being affected by cross-interference. The existing TDLAS technology is single-wavelength measurement or wavelength measurement switched in a certain wavelength range, and is lack of counter measures for broad-spectrum interference of dust and aerosol.
The interference of smoke dust, liquid drops, fog, aerosol and the like on absorption spectrums under complex working conditions is caused by the requirement of ultra-clean emission for pollutant emission in the field of environmental protection, namely, wet dust removal is added after desulfurization and dust removal, so that the emission humidity is increased, and a large amount of liquid drops are formed; in addition, dust and aerosol formed during combustion, including sulfate, nitrate, small amount of organic matter and heavy metal powder, can also interfere with the test spectrum. Single wavelength measurements or small range wavelength-switched measurements cannot account for the above-mentioned broad spectrum interference.
Disclosure of Invention
Therefore, the embodiment of the invention provides a processing method of a laser measurement signal and a multi-wavelength laser measurement system, so as to solve the problems of aerogel spectrum interference and measurement inaccuracy in the prior art.
In order to achieve the above object, an embodiment of the present invention provides the following:
in an aspect of an embodiment of the present invention, there is provided a method of processing a laser measurement signal, the method including:
step 1: sequentially emitting a first wavelength lambda to the atmosphere to be measured1A second wavelength lambda2The measuring laser of (1); wherein the absorption peak absorption intensity ratio of the measuring laser is A1：A2Setting the influence of aerosol on the measurement laser to be B1、B2；
Step 2: obtaining a concentration measurement value S of the measurement laser1、S2The ambient temperature value T of the atmosphere to be measured, and the absorption coefficient value Ks of the measurement laser at the measurement wavelength1(T)、Ks2(T)；
And step 3: respectively constructing functions between the actual concentration C of the atmosphere to be detected and the actual concentrations B1 and B2;
and 4, step 4: and calculating the actual concentration value of the atmosphere to be measured according to the two constructed functions.
Further, the first wavelength λ1And a second wavelength lambda2Is less than or equal to 1nm, and the influence B of the aerosol on the measurement laser is set1、B2Are equal in value.
Further, in step 3:
the function between the actual concentration C and B1 of the atmosphere to be measured is formula (1):
S1＝A1·Ks1(T)·C+B1；
the function between the actual concentration C and B2 of the atmosphere to be measured is formula (2):
S2＝A2·Ks2(T)·C+B1。
further, in step 4,
subtracting the formula (2) from the formula (1), and obtaining the actual concentration of the atmosphere to be measured as a formula (3):
further, the method further comprises:
and 5: sequentially emitting multiple groups of measuring wavelengths into the atmosphere to be measured to obtain the concentration measuring values of the multiple groups of measuring lasers;
step 6: calculating to obtain the real concentration of the multiple groups of atmospheres to be measured according to the obtained concentration measurement values of the multiple groups of measurement lasers;
and 7: forming a set P of a plurality of groups of concentration measurement values of the measurement laser and a plurality of groups of real concentrations of the atmosphere to be measured:
P＝{(S1,C1),(S2,C2),...,(Sn,Cn)}。
further, the method further comprises:
and 8: and according to the set P, performing polynomial curve fitting:
p(S；b)＝b0+b1S+b2S2+......+bnSn；
wherein P (S; b) is [ C ]0,C1,C2......Cn]TS is [ S ]0、S1、S2……Sn]TThe polynomial coefficient b is [ b0,b1,b2......bn]T，n≥0；
And step 9: a prediction function is fitted.
Further, the method is applied to the measurement of humidity.
Further, two absorption measurement wavelength groups of 1.37um and 1.8um are selected as the measurement laser to carry out multi-wavelength measurement;
wherein the wavelength selected by the 1.37um wave band is 1367.86nm, 1368.59nm or 1369.25 nm; the wavelength of the 1.8um wave band is selected to be 1840.0nm, 1847.1nm or 1854.0 nm.
In an aspect of an embodiment of the present invention, there is also provided a multi-wavelength laser measuring system including:
the device comprises a laser capable of generating various wavelengths, an optical circulator, a multi-path optical switch for switching different wavelengths, a TDLAS multi-wavelength humidity measurement system and a data acquisition control system;
wherein, TDLAS multi-wavelength humidity measurement system includes: the device comprises a laser wavelength coordination module, a laser temperature control module, a laser wavelength absorption module and a PIN photodiode;
the circuit end of the laser is electrically connected with the laser wavelength coordination module and the laser temperature control module, the optical circuit end of the laser is connected with the first end of the optical circulator, the second end of the optical circulator is connected with the multi-way switch, the third end of the optical circulator is connected with the optical fiber input end of the PIN photodiode, and the circuit end of the PIN photodiode is connected with the laser wavelength absorption module;
one end of the multi-path optical switch is connected with the optical circulator of each laser, and the other end of the multi-path optical switch is connected with the detection air chamber;
the data acquisition control system is in control connection with the multi-path optical switch, provides an optical path switching command for controlling the multi-path optical switch, and synchronizes measurement signals.
The embodiment of the invention has the following advantages:
the embodiment of the invention discloses a processing method of a laser measurement signal and a multi-wavelength laser measurement system, provides common mode aerosol spectrum interference resistance, establishes a multi-wavelength measurement system, deducts aerosol common mode influence interference, improves measurement accuracy, and meets the requirements of humidity and other gas measurement accuracy under complex working conditions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a schematic flowchart of a processing method of a laser measurement signal according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a multi-wavelength laser measurement system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a water vapor absorption peak at 1.37 microns provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of a moisture absorption peak around 1.80 μm according to an embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
Examples
Referring to fig. 1 and 2, an embodiment of the present invention provides a multi-wavelength laser measurement system, which includes: the device comprises a laser capable of generating various wavelengths, an optical circulator, a multi-path optical switch for switching different wavelengths, a TDLAS multi-wavelength humidity measurement system and a data acquisition control system.
Wherein, TDLAS multi-wavelength humidity measurement system includes: the device comprises a laser wavelength coordination module, a laser temperature control module, a laser wavelength absorption module and a PIN photodiode.
Specifically, the circuit end of the laser is electrically connected with the laser wavelength coordination module and the laser temperature control module, the optical circuit end of the laser is connected with the first end of the optical circulator, the second end of the optical circulator is connected with the multi-way switch, the third end of the optical circulator is connected with the optical fiber input end of the PIN photodiode, and the circuit end of the PIN photodiode is connected with the laser wavelength absorption module.
Furthermore, one end of the multi-path optical switch is connected with the optical circulator of each laser, and the other end of the multi-path optical switch is connected with the detection air chamber. The data acquisition control system is connected with the multi-path optical switch in a control way, provides an optical path switching command for controlling the multi-path optical switch and synchronizes measurement signals.
As shown in fig. 2, in the specific implementation process, a laser humidity measurement system under a multi-wavelength anti-interference complex working condition includes a multi-wavelength laser (with wavelengths of 1, 2, 3.. n), an optical circulator, a multi-path optical switch, a TDLAS multi-wavelength humidity measurement system, and a data acquisition control system.
Wherein TDLAS multi-wavelength humidity measurement system includes: the device comprises a laser wavelength tuning module, a laser temperature control module, a laser wavelength absorption module and a PIN photodiode. The laser circuit end is connected with a laser wavelength tuning module and a laser temperature control module for control, the laser circuit end is connected with an optical circulator, one end of the optical circulator is connected with a multi-path optical switch, the other end of the optical circulator is connected with a PIN photodiode optical fiber input end, and the PIN photodiode circuit end is connected with a laser wavelength absorption module.
The multi-path optical switch controls and switches the measuring system with different wavelengths through an RS-232 serial port, the input end of the multi-path optical switch is connected with the optical circulator of each wavelength laser, and the other end of the multi-path optical switch is connected with the detection air chamber. Wherein the multi-wavelength measurement adopts 3 or more wavelength lasers to carry out independent measurement.
The data acquisition control system provides an optical path switching command and a synchronous measurement signal for controlling the acquisition of the multi-path optical switch. And measuring the measurement values of the wavelengths sequentially according to the time instants t1, t2 and t3..
Aiming at the problems of interference of aerosol on an absorption spectrum and inaccuracy of system measurement, the embodiment of the invention designs the multi-wavelength anti-interference control method, and simultaneously develops 3 or more wavelengths with the span exceeding 0.5um aiming at the absorption interference of the aerosol common-mode spectrum, thereby avoiding the interference of the aerosol broad-spectrum. And interference terms are deducted through a simultaneous equation set, so that the aim of accurate measurement is fulfilled.
Specifically, as shown in fig. 1 and 2, an embodiment of the present invention further provides a method for processing a laser measurement signal, where the method includes the following steps:
step 1: sequentially emitting a first wavelength lambda to the atmosphere to be measured1A second wavelength lambda2The measuring laser of (1); wherein the ratio of absorption peak to absorption intensity of the absorption peak of the measuring laser is A1：A2The influence of the aerosol on the measurement laser is set as B1、B2。
Step 2: obtaining a concentration measurement S of a measurement laser1、S2Ambient temperature value T of the atmosphere to be measured, absorption coefficient value Ks of the measurement laser at the measurement wavelength1(T)、Ks2(T)。
And step 3: and respectively constructing functions between the actual concentration C of the atmosphere to be measured and B1 and B2.
And 4, step 4: and calculating the actual concentration value of the atmosphere to be measured according to the two constructed functions.
Specifically, in step 1, the first wavelength λ1And a second wavelength lambda2The difference of (A) is less than or equal to 1nm, and the influence B of aerosol on the measurement laser is set1、B2Are equal in value. Alternatively, the fixing response is set to be consistent with wavelengths close (< 1 nm).
Further, in step 3: the function between the actual concentration C and B1 of the atmosphere to be measured is given by the formula (1):
S1＝A1·Ks1(T)·C+B1；
the function between the actual concentration C and B2 of the atmosphere to be measured is given by equation (2):
S2＝A2·Ks2(T)·C+B1。
further, in step 4, subtracting the formula (1) from the formula (2) to obtain the actual concentration of the atmosphere to be measured as formula (3):
in the specific implementation process, under a complex working condition of the measurement system, particularly in the presence of a large amount of aerosol, the aerosol has influence on absorption under a wider spectrum, the aerosol has influence B on the spectrum system, and the fixing effects are consistent under the condition that the wavelength is close to (less than or equal to 1 nm). Because the system uses three wavelengths to measure independently, the absorption intensity ratios of the three absorption peaks are set to be A1: A2: a3, setting the ambient temperature in the atmosphere to be measured as T, setting the influence of two close wavelengths as B1 and the influence of a third wavelength as B2 under the influence of the aerosol spectrum, and setting three absorption peak measurement values as follows:
S1＝A1·Ks1(T)·C+B1 (1)
S2＝A2·Ks2(T)·C+B1 (2)
S3＝A3·Ks3(T)·C+B2 (3)
wherein S1、S2、S3Measuring the measured value of humidity for the system, A1、A2、A3Is the ratio of the absorption intensities of the three absorption peaks, Ks1(T)、Ks2(T)、Ks3(T) is the absorption coefficient of the system at the measurement wavelength.
(1) The formula (2) can be given as follows:
as long as the atmosphere T to be measured is measured, the current actual concentration C can be obtained, and meanwhile, the aerosol interference of B is avoided. And the third wavelength and more wavelengths participate in calculation, and a plurality of groups of equations are simultaneous, so that other interference factors are removed, and the measurement precision is improved.
Further, the method further comprises:
and 5: and sequentially emitting multiple groups of measurement wavelengths into the atmosphere to be measured to obtain the concentration measurement values of multiple groups of measurement lasers. Specifically, the concentration measurement value can be directly obtained according to a measurement system, and when the measurement is performed by using laser with multiple groups of wavelengths, multiple groups of measurement values are obtained.
Step 6: and calculating to obtain the real concentration of the multiple groups of atmospheres to be measured according to the obtained concentration measurement values of the multiple groups of measurement lasers. Specifically, the real concentration values of a plurality of groups of atmospheres to be measured can be calculated according to the formula (3) and a plurality of groups of measured values.
And 7: forming a set of concentration measurement values of a plurality of groups of measurement lasers and a plurality of groups of real concentrations of atmosphere to be measured, specifically, obtaining solutions about the concentration C and the measurement value S through multiple absorption peaks, and forming a set P of the measurement values and the real concentrations C:
P＝{(S1,C1),(S2,C2),...,(Sn,Cn)}。
further, the method further comprises:
and 8: performing polynomial curve fitting according to a set P, wherein the set P can fit a polynomial curve: :
p(S；b)＝b0+b1S+b2S2+......+bnSn；
wherein the polynomial is written in the form Sb ═ C, i.e. P (S; b) is [ C [ ]0,C1,C2......Cn]TS is [ S ]0、S1、S2……Sn]TThe polynomial coefficient b is [ b0,b1,b2......bn]T，n≥0。
And step 9: a prediction function is fitted according to step 8. Fitting the curve according to a polynomial, with increasing n, increasing the number of polynomial levels, SnAnd Sn-1The values of (a) are getting closer, i.e. the measured values have less and less error from the actual values.
Alternatively, the system and method of the present invention may be applied to the measurement of humidity.
As shown in fig. 3 and 4, the measurement error decreases with the number of test wavelengths according to the present system. According to the water vapor absorption wavelength, two absorption measurement wavelength groups of 1.37um and 1.8um are selected for multi-wavelength measurement, wherein the water vapor absorption wavelength with the 1.37um waveband remarkable is 1367.86nm, 1368.59nm and 1369.25nm, the absorption measurement wavelength group at the 1.37um position is formed by adopting any one of the wavelengths, and the absorption measurement wavelength group at the 1.8um position is formed by selecting 1840.0nm, 1847.1nm and 1854.0nm at the 1.8um waveband.
The method provided by the embodiment of the invention provides a measuring method for measuring the influence of aerosol spectrum under complex working conditions by using a TDLAS technology, and the aerosol is spectrum interference, so that the aerosol spectrum interference is deducted by establishing 3 or more wavelength measuring systems to independently and approximately synchronously carry out measurement.
The processing method of the laser measurement signal and the multi-wavelength laser measurement system provide common-mode aerosol spectrum interference resistance, establish the multi-wavelength measurement system, deduct the aerosol common-mode influence interference, improve the measurement accuracy, and meet the requirements of humidity and other gas measurement accuracy under complex working conditions.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. A method of processing a laser measurement signal, the method comprising:
step 1: sequentially emitting a first wavelength lambda to the atmosphere to be measured1A second wavelength lambda2The measuring laser of (1); wherein the absorption peak absorption intensity ratio of the measuring laser is A1：A2Setting the influence of aerosol on the measurement laser to be B1、B2；
Step 2: obtaining a concentration measurement value S of the measurement laser1、S2The ambient temperature value T of the atmosphere to be measured, and the absorption coefficient value Ks of the measurement laser at the measurement wavelength1(T)、Ks2(T)；
And step 3: respectively constructing functions between the actual concentration C of the atmosphere to be detected and the actual concentrations B1 and B2;
and 4, step 4: and calculating the actual concentration value of the atmosphere to be measured according to the two constructed functions.
2. The method according to claim 1, wherein, in step 1,
the first wavelength λ1And a second wavelength lambda2Is less than or equal to 1nm, and the influence B of the aerosol on the measurement laser is set1、B2Are equal in value.
3. The method according to claim 2, characterized in that in step 3:
the function between the actual concentration C and B1 of the atmosphere to be measured is formula (1):
S1＝A1·Ks1(T)·C+B1；
the function between the actual concentration C and B2 of the atmosphere to be measured is formula (2):
S2＝A2·Ks2(T)·C+B1。
4. the method according to claim 3, wherein, in step 4,
subtracting the formula (2) from the formula (1), and obtaining the actual concentration of the atmosphere to be measured as a formula (3):
5. the method of claim 4, further comprising:
and 5: sequentially emitting multiple groups of measuring wavelengths into the atmosphere to be measured to obtain the concentration measuring values of the multiple groups of measuring lasers;
step 6: calculating to obtain the real concentration of the multiple groups of atmospheres to be measured according to the obtained concentration measurement values of the multiple groups of measurement lasers;
and 7: forming a set P of a plurality of groups of concentration measurement values of the measurement laser and a plurality of groups of real concentrations of the atmosphere to be measured:
P＝{(S1,C1),(S2,C2),...,(Sn,Cn)}。
6. the method of claim 5, further comprising:
and 8: and according to the set P, performing polynomial curve fitting:
p(S；b)＝b0+b1S+b2S2+......+bnSn；
wherein P (S; b) is [ C ]0,C1,C2......Cn]TS is [ S ]0、S1、S2……Sn]TThe polynomial coefficient b is [ b0,b1,b2......bn]T，n≥0；
And step 9: a prediction function is fitted.
7. The method according to claim 1, characterized in that the method is applied to the measurement of humidity.
8. The method of claim 7,
selecting two absorption measurement wavelength groups of 1.37um and 1.8um as the measurement laser to carry out multi-wavelength measurement;
wherein the wavelength selected by the 1.37um wave band is 1367.86nm, 1368.59nm or 1369.25 nm; the wavelength of the 1.8um wave band is selected to be 1840.0nm, 1847.1nm or 1854.0 nm.
9. A multi-wavelength laser measurement system, the system comprising:
the device comprises a laser capable of generating various wavelengths, an optical circulator, a multi-path optical switch for switching different wavelengths, a TDLAS multi-wavelength humidity measurement system and a data acquisition control system;
wherein, TDLAS multi-wavelength humidity measurement system includes: the device comprises a laser wavelength coordination module, a laser temperature control module, a laser wavelength absorption module and a PIN photodiode;
the circuit end of the laser is electrically connected with the laser wavelength coordination module and the laser temperature control module, the optical circuit end of the laser is connected with the first end of the optical circulator, the second end of the optical circulator is connected with the multi-way switch, the third end of the optical circulator is connected with the optical fiber input end of the PIN photodiode, and the circuit end of the PIN photodiode is connected with the laser wavelength absorption module;
one end of the multi-path optical switch is connected with the optical circulator of each laser, and the other end of the multi-path optical switch is connected with the detection air chamber;
the data acquisition control system is in control connection with the multi-path optical switch, provides an optical path switching command for controlling the multi-path optical switch, and synchronizes measurement signals.
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