CN105403527A - Method for detecting performances of system employing harmonic process to measure concentration of steam - Google Patents
Method for detecting performances of system employing harmonic process to measure concentration of steam Download PDFInfo
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Abstract
The invention provides a method for detecting the performances of a system which employs a harmonic process to measure the concentration of steam, belonging to the field of detection of gas sensing systems. A related system mainly comprises a one-chip microcomputer, a driving module, a circuit module, an air chamber module, an optical path module and a signal acquisition module, wherein the to-be-detected circuit module comprises a current-voltage conversion component and a lock-in amplifier, and the optical path module comprises a laser and a photoelectric detector. The method is characterized in that the Beer-Lambert law is simulated; high-frequency sine driving signals of the laser are multiplied by the absorption coefficient of gas to simulate absorption process; the signals are used as final driving signals and input into the detection system; and by connecting the system with different detection modules and acquiring analysis data, the performances consisting of linearity and repeatability of the system are confirmed. The system provided by the invention realizes calibration of the performances of the detection system for non-standard gas, i.e., steam, and is of important significance to detection of the concentration of steam.
Description
Technical field
The present invention relates to gas sensing system detection field, specifically a kind of method detecting Harmonic Method survey water vapor concentration system performance.
Background technology
From the rock gas of underground output all containing a certain amount of water, when temperature reduces or pressure increases, a part for these water vapor may be separated out, and forms aqueous water, may form the acid solution with strong rotten candle property, rotten candle pipeline and equipment.Transformer can cause water to be entered by the external world in transport, storage and use procedure, and oily autoxidation also can produce water simultaneously.These gaseous impuritieies and minor amount of water branch reduce the insulating property of transformer oil; When containing moisture in New insulated medium and arc-extinguishing medium gas in extra-high voltage transmission equipment, easily generate the chemical substance of rotten candle property, corruption candle insulator arrangement.Therefore, water vapor detects the normal use for the equipment of guarantee in rock gas, oil, power industry, avoids the generation of accidental explosion accident significant.
Infrared spectra adsorption method is one of important method detecting water vapor concentration, has Real-Time Monitoring, and response is fast, and the life-span is long, the advantage that cost is low, but traditional spectral absorption method is subject to electromagnetic interference (EMI).
In the academic dissertation " spectral absorption formula gas detect theory and technical research " of the doctoral candidate Zhang Keke of Harbin Engineering University, propose the concentration detecting gas with Harmonic Method, and its performance is assessed.But this appraisal procedure is difficult to realize for water vapor, because as a kind of non-standard gas, water vapor does not have a standard detected to make benchmark.The action need of prior art, when in esse water vapor occurs to absorb, just can provide testing result.But because the performance of detection system self is unknown, the reliability of the result detected can not be judged exactly.So in the testing process of reality, how determining the performance of detection system, comprise the linearity and repeatability, is a urgent problem.
Summary of the invention
In order to solve the problem, the invention provides a kind of method detecting Harmonic Method survey water vapor concentration system performance.
The technical scheme of the inventive method is as follows:
A kind of method detecting Harmonic Method survey water vapor concentration system performance, realized by following system, this system mainly comprises single-chip microcomputer, driver module, circuit module, gas path module and light path module, signal acquisition module, and circuit module comprises current-voltage modular converter and lock-in amplifier; Light path module comprises laser instrument, coupling mechanism and photodetector; Gas path module comprises air chamber; Simulation Bill-Lang Bo law, the high frequency sinusoidal drive singal of laser instrument is multiplied at corresponding wavelength place with the absorption coefficient of gas, simulation actual absorption process, and this signal is used as final drive singal input detection systems, by accessing different detection modules in system, collection analysis data, thus confirm the repeatability of system and the performance of the linearity two aspect, below be divided into circuit module, light path module and gas path module three parts to detect, concrete detecting step is:
One: the detection of circuit module performance
1) single-chip microcomputer is connected with driver module, equivalent resistance driver module being arranged the pin place laser instrument of connecting laser replaces, the output terminal of driver module is connected with the input end of current-voltage modular converter, the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
2) above-mentioned each parts are connected, switch on power, system can normally be worked;
3) mathematical software is passed through, simulation Bill-Lang Bo law, parameters light intensity I (v), absorption coefficient (ν) is specific function, air chamber length L is the parameter that immobilizes, and with gas concentration C for variable, can obtain different drive singal, arranging C is respectively 10 groups of same concentrations and 10 groups of variable concentrations, can obtain the drive singal that 10 groups of identical drive singal are different with 10 groups;
4) driver module is given by the drive singal of simulating obtain 10 groups identical drive singal different with 10 groups successively by single-chip microcomputer, after signal exports from driver module, access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, gathers the Output rusults of lock-in amplifier by signal acquisition module;
5) Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this circuit system module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better;
Two: the detection of light path module performance
6) single-chip microcomputer is connected with driver module, driver module is connected with laser instrument, coupling mechanism is placed after laser instrument, the output of coupling mechanism is connected with photodetector, the output terminal of photodetector is connected with the input end of current-voltage modular converter, the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
7) above-mentioned each parts are connected, switch on power, system can normally be worked;
8) by single-chip microcomputer successively by step 3) in simulate obtain 10 groups identical drive singal different with 10 groups drive singal give driver module, after signal exports from driver module, enter laser instrument, drive laser sends the light signal corresponding with drive singal, light signal enters photodetector after coupling mechanism, carry out opto-electronic conversion, photodetector output signal access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, the Output rusults of lock-in amplifier is gathered by signal acquisition module,
9) in step 5) basis on, the Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this system light path module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better;
Three: the detection of gas path module performance
10) single-chip microcomputer is connected with driver module, driver module is connected with laser instrument, coupling mechanism is placed after laser instrument, the output of coupling mechanism is connected with air chamber, air chamber photodetector is connected, the output terminal of photodetector is connected with the input end of current-voltage modular converter, and the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
11) with nitrogen by emptying for air original in its air chamber because simulated the absorption process of gas in drive singal, in real process, without the need to repeating actual gas absorption process again, therefore need air chamber emptying;
12) above-mentioned each parts are connected, switch on power, system can normally be worked;
13) by single-chip microcomputer successively by step 3) in simulate obtain 10 groups identical drive singal different with 10 groups drive singal give driver module, after signal exports from driver module, enter laser instrument, drive laser sends the light signal corresponding with drive singal, light signal enters air chamber after coupling mechanism, the output signal of air chamber enters photoelectricity photodetector, carry out opto-electronic conversion, photodetector output signal access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, the Output rusults of lock-in amplifier is gathered by signal acquisition module,
14) in step 5) and step 9) basis on, the Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this system gas path module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better.
The invention has the beneficial effects as follows:
1) by the simulation to gas actual absorption process, the analysis of Harmonic Method being surveyed to water vapor concentration system performance can be realized, for the detection of this non-standard gas of water vapor provides standard.
2) obtain the performance of circuit module in system, light path module and gas path module respectively, in this case, can improve each module in system targeted specifically.
Accompanying drawing explanation
Fig. 1 detects the system construction drawing that Harmonic Method surveys the performance of water vapor concentration system.
In figure, 1: single-chip microcomputer, 2: driver module, 3: lock-in amplifier, 4: signal acquisition module, 5: current/voltage conversion portion, 6: photodetector, 7: air chamber, 8: coupling mechanism, 9: laser instrument.
Fig. 2 is the result when high frequency sinusoidal drives to the simulation of Bill-Lang Bo law.
Embodiment
Below in conjunction with accompanying drawing and be that the present invention will be further described for embodiment, but be not limited thereto.
Embodiment:
A kind of method detecting Harmonic Method survey water vapor concentration system performance, realized by following system, this system mainly comprises single-chip microcomputer, driver module, circuit module, gas path module and light path module, signal acquisition module, and circuit module comprises current-voltage modular converter and lock-in amplifier; Light path module comprises laser instrument, coupling mechanism and photodetector; Gas path module comprises air chamber; Simulation Bill-Lang Bo law, the high frequency sinusoidal drive singal of laser instrument is multiplied at corresponding wavelength place with the absorption coefficient of gas, simulation actual absorption process, and this signal is used as final drive singal input detection systems, by accessing different detection modules in system, collection analysis data, thus confirm the repeatability of system and the performance of the linearity two aspect, below be divided into circuit module, light path module and gas path module three parts to detect, concrete detecting step is:
One: the detection of circuit module performance
1) single-chip microcomputer is connected with driver module, equivalent resistance driver module being arranged the pin place laser instrument of connecting laser replaces, the output terminal of driver module is connected with the input end of current-voltage modular converter, the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
2) above-mentioned each parts are connected, switch on power, system can normally be worked;
3) mathematical software is passed through, simulation Bill-Lang Bo law, parameters I (v), α (ν) is specific function, air chamber length L is the parameter that immobilizes, and with gas concentration C for variable, can obtain different drive singal, arranging C is respectively 10 groups of same concentrations and 10 groups of variable concentrations, can obtain the drive singal that 10 groups of identical drive singal are different with 10 groups;
4) driver module is given by the drive singal of simulating obtain 10 groups identical drive singal different with 10 groups successively by single-chip microcomputer, after signal exports from driver module, access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, gathers the Output rusults of lock-in amplifier by signal acquisition module;
5) Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this circuit system module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better;
Two: the detection of light path module performance
6) single-chip microcomputer is connected with driver module, driver module is connected with laser instrument, coupling mechanism is placed after laser instrument, the output of coupling mechanism is connected with photodetector, the output terminal of photodetector is connected with the input end of current-voltage modular converter, the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
7) above-mentioned each parts are connected, switch on power, system can normally be worked;
8) by single-chip microcomputer successively by step 3) in simulate obtain 10 groups identical drive singal different with 10 groups drive singal give driver module, after signal exports from driver module, enter laser instrument, drive laser sends the light signal corresponding with drive singal, light signal enters photodetector after coupling mechanism, carry out opto-electronic conversion, photodetector output signal access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, the Output rusults of lock-in amplifier is gathered by signal acquisition module,
9) in step 5) basis on, the Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this system light path module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better;
Three: the detection of gas path module performance
10) single-chip microcomputer is connected with driver module, driver module is connected with laser instrument, coupling mechanism is placed after laser instrument, the output of coupling mechanism is connected with air chamber, air chamber is connected with photodetector, the output terminal of photodetector is connected with the input end of current-voltage modular converter, and the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
11) with nitrogen by emptying for air original in its air chamber because simulated the absorption process of gas in drive singal, in real process, without the need to repeating actual gas absorption process again, therefore need air chamber emptying;
12) above-mentioned each parts are connected, switch on power, system can normally be worked;
13) by single-chip microcomputer successively by step 3) in simulate obtain 10 groups identical drive singal different with 10 groups drive singal give driver module, after signal exports from driver module, enter laser instrument, drive laser sends the light signal corresponding with drive singal, light signal enters air chamber after coupling mechanism, the output signal of air chamber enters photoelectricity photodetector, carry out opto-electronic conversion, photodetector output signal access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, the Output rusults of lock-in amplifier is gathered by signal acquisition module,
14) in step 5) and step 9) basis on, the Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this system gas path module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better.
Claims (1)
1. one kind is detected the method that Harmonic Method surveys water vapor concentration system performance, realized by following system, this system mainly comprises single-chip microcomputer, driver module, circuit module, gas path module and light path module, signal acquisition module, and circuit module comprises current-voltage modular converter and lock-in amplifier; Light path module comprises laser instrument, coupling mechanism and photodetector; Gas path module comprises air chamber, simulation Bill-Lang Bo law, the high frequency sinusoidal drive singal of laser instrument is multiplied at corresponding wavelength place with the absorption coefficient of gas, simulation actual absorption process, and this signal is used as final drive singal input detection systems, by accessing different detection modules in system, collection analysis data, thus confirm the repeatability of system and the performance of the linearity two aspect, below be divided into circuit module, light path module and gas path module three parts to detect, concrete detecting step is:
One: the detection of circuit module performance
1) single-chip microcomputer is connected with driver module, equivalent resistance driver module being arranged the pin place laser instrument of connecting laser replaces, the output terminal of driver module is connected with the input end of current-voltage modular converter, the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
2) above-mentioned each parts are connected, switch on power, system can normally be worked;
3) mathematical software is passed through, simulation Bill-Lang Bo law, parameters light intensity I (v), absorption coefficient (ν) is specific function, air chamber length L is the parameter that immobilizes, and with gas concentration C for variable, can obtain different drive singal, arranging C is respectively 10 groups of same concentrations and 10 groups of variable concentrations, can obtain the drive singal that 10 groups of identical drive singal are different with 10 groups;
4) driver module is given by the drive singal of simulating obtain 10 groups identical drive singal different with 10 groups successively by single-chip microcomputer, after signal exports from driver module, access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, gathers the Output rusults of lock-in amplifier by signal acquisition module;
5) Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this circuit system module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better;
Two: the detection of light path module performance
6) single-chip microcomputer is connected with driver module, driver module is connected with laser instrument, coupling mechanism is placed after laser instrument, the output of coupling mechanism is connected with photodetector, the output terminal of photodetector is connected with the input end of current-voltage modular converter, the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
7) above-mentioned each parts are connected, switch on power, system can normally be worked;
8) by single-chip microcomputer successively by step 3) in simulate obtain 10 groups identical drive singal different with 10 groups drive singal give driver module, after signal exports from driver module, enter laser instrument, drive laser sends the light signal corresponding with drive singal, light signal enters photodetector after coupling mechanism, carry out opto-electronic conversion, photodetector output signal access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, the Output rusults of lock-in amplifier is gathered by signal acquisition module,
9) in step 5) basis on, the Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this system light path module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better;
Three: the detection of gas path module performance
10) single-chip microcomputer is connected with driver module, driver module is connected with laser instrument, coupling mechanism is placed after laser instrument, the output of coupling mechanism is connected with air chamber, air chamber photodetector is connected, the output terminal of photodetector is connected with the input end of current-voltage modular converter, and the output terminal of current-voltage modular converter is connected with the input end of lock-in amplifier, and the output terminal of lock-in amplifier is connected to signal acquisition module;
11) with nitrogen by emptying for air original in its air chamber because simulated the absorption process of gas in drive singal, in real process, without the need to repeating actual gas absorption process again, therefore need air chamber emptying;
12) above-mentioned each parts are connected, switch on power, system can normally be worked;
13) by single-chip microcomputer successively by step 3) in simulate obtain 10 groups identical drive singal different with 10 groups drive singal give driver module, after signal exports from driver module, enter laser instrument, drive laser sends the light signal corresponding with drive singal, light signal enters air chamber after coupling mechanism, the output signal of air chamber enters photoelectricity photodetector, carry out opto-electronic conversion, photodetector output signal access current/voltage conversion portion, the signal input pin of the signal input lock-in amplifier after conversion, the Output rusults of lock-in amplifier is gathered by signal acquisition module,
14) in step 5) and step 9) basis on, the Analysis of test results that signal acquisition module obtains is arranged, obtain the repeatability of this system gas path module and the performance of the linearity: to the Analysis of test results of 10 groups of identical drive signals, calculate the standard deviation between collection result, standard deviation is less, then repeatability is better; To the Analysis of test results of 10 groups of different driving signals, with variable concentrations C for independent variable, with corresponding testing result for dependent variable, according to least square method, can obtain the related coefficient of independent variable and dependent variable, this related coefficient is higher, and the linearity is better.
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Application publication date: 20160316 |