CN1467487A - Tunable laser spectrum secondary harmonic intelligent analyzing method and implementing equipment - Google Patents
Tunable laser spectrum secondary harmonic intelligent analyzing method and implementing equipment Download PDFInfo
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Abstract
The invention relates to tunable semiconductor laser spectrum secondary harmonic linearisation multiple components intelligent analyzing method and apparatus for realizing the same. which is based on the PC bus line visual equipment technology, wherein the intelligent heuristic search, pattern recognition and matching, self-establishing fundamental wave and modulating wave are introduced into the software and hardware, thus achieving the purpose of good mobility, high precision and stability .
Description
Technical field
Laser spectral analysis.
Background technology
Concentrate in population forward city is worldwide trend, my populous nation has also accelerated urbanization process, the greening environment of urban construction has become important symbol, yet according to statistics, 80% of urban air environmental pollution derives from motor-vehicle tail-gas, this air pollutants have high toxicity, low content, many components, persistent characteristics, yet it is also relatively more difficult to carry out many components remote measurement real-time dynamicly at present, rest on simulation kinetic measurement state.Utilize the laser spectral analysis pollutant, not only luminous energy is concentrated, and by different components spectral absorption is had strong selectivity, is a kind of otherwise effective technique approach therefore.
Laser spectral analysis has the spectral analysis based on the modulated light wave of the Difference Absorption spectrophotometric spectra analysis of opticator and tunable laser again, the spectral analysis of modulated light wave is to use tunable laser, it is carried out multiple modulation, generation light wave output, semiconductor laser with tunable are wherein a kind of.
The wavelength-modulation technique of tunable laser is the gordian technique during tunable laser spectrum is used.Existing method is to utilize special instrument to produce sawtooth wave and sine wave, by totalizer sawtooth wave and sine-wave superimposed is got up then, comes laser instrument is carried out wavelength-modulated.There are three problems in this method: the one, because the complicacy of field environment, in order to obtain true and reliable monitoring result, often to change and (comprise the sawtooth wave frequency the modulation signal of laser instrument, amplitude and sinusoidal wave modulating frequency and depth of modulation), this all needs to revise manually the output of instrument, and this change generally needs the professional to finish; The 2nd, for complicated a little modulation waveform, general instrument can't produce, and must order especially; The 3rd, because modulation signal produces by specialized equipment, it is very little to make that the volume of a whole set of tail gas monitoring system can not be done, and is not suitable for open-air installation and debugging.
In addition, the direct absorption line of many employings is analyzed in spectral analysis, though the inversion algorithm of this analytical concentration is ripe, but there is following shortcoming in it:
1, directly absorption line has the inclination background.
2, to carry out the sample check and correction, may have sampling error.
3, low frequency noises will be carried out baseline calibration.
4, unfavorable to the discriminating of wide band absorption Molecular Selection.
5, differentiate the small spectrum peak between the dpd signal is difficult.
Summary of the invention
Purpose of the present invention is to use tunable laser to carry out the spectral analysis of wavelength-modulated as mentioned above, the instrument that uses does not need professional's manual adjustment, can independently conveniently as required produce modulation waveform, on this basis, in the spectral analysis of retrieving concentration, do not need the frequent verification of sample, measure baseline stability, noiseless is disturbed, to the good spectroscopic analysis methods of multiple component selectivity.
The second harmonic intelligent analysis method of tunable laser spectrum of the present invention is based on the virtual instrument technique of PC bus, adopts the modular functionality design, has absorbed the intelligent software method for designing.
The retrieving concentration analysis that can realize tunable laser spectrum second harmonic must possess following condition at least:
1, the intelligentized design of graphic user interface modulation waveform.
2, tunable laser modulation waveform outgoing efficient wants high.
3, modulated spectrum is little by the path scattering loss, and light wave outgoing and reflection to obtain the measured object concentration signal by tested path twice strong.
4, when the receiving spectrum signal, the undistorted amplification of opto-electronic conversion and weak signal is eager to excel.
Under the condition of above-mentioned conditions being possessed, even obtained second harmonic signal, also will further adjust modulation wave signal, just can make the second harmonic retrieving concentration more accurate, this modulation may need repeatedly test just can find the allocation optimum of certain condition modulated waveform parameter; This relation has certain complicacy, does not exist one-to-one relationship, thus to reach optimum configuration, need to the waveform modulated technology use handy.This just need offer user close friend's interface and function flexibly, and wherein requiring not only has the modulating wave parameter, also will have more various first-harmonic to participate in cooperating.In theory, utilize the second harmonic analysis to be exactly because the amplitude of 2F signal concentration direct and pollutant is linearly proportional, inversion algorithm is very simple; In order to maintain this linear relationship, must guarantee the allocation optimum of modulating wave.Under same condition, when the amplitude of second harmonic big more, then can detected precision high more, the shape of second harmonic be then directly relevant with modulation waveform with amplitude, for example in certain amplitude range, the amplitude of second harmonic is linear the increase along with the increase of modulating wave amplitude, shape is also constant, if surpass this scope, the amplitude of second harmonic signal is along with the increase of modulating wave amplitude reduces on the contrary, and shape also can change, and causes carrying out the retrieving concentration computing.In addition, select the difference of laser instrument and the variation of environment for use, the shape of second harmonic and its centre wavelength position also can be different, therefore need dynamically the shape and the amplitude of modulation waveform to be adjusted, in the hope of reaching the optimum condition that detects second harmonic, guarantee the accuracy of measurement result.
The analytical approach that the generation of intelligent modulation and second harmonic carry out many components concentration in real time is based on the virtual instrument technique of PC bus, soft, the hardware modularity design, the introducing of Intelligentized method, hardware is finished the conversion of data and the output of modulated light wave, software is finished with the user-interactive interface with to the control of hardware, in the software modularity design, set up intelligent knowledge base, it has comprised the second harmonic signal feature directly related with modulation waveform that obtains in the great deal of laboratory tests, in under actual field condition, using, utilize definite scheme of carrying out environmental baseline Adaptive Modulation waveform based on the heuristic search algorithm and the pattern match of knowledge base.
In order to make user and beginner be familiar with and grasp the second harmonic analytical approach of the intelligent tunable laser spectrum of the present invention, generate at modulating wave on the basis of user interface, enter intelligent auxiliary waveform design software by purposes and step program, can call the correlation test record in the knowledge base, provide detailed experiment experience so that this high-tech new method of faster grasp, and provide expert's Pre-Evaluation, no matter the result of Pre-Evaluation how, all take principle of non-intervention, do not influence setting up of autonomous modulation waveform.
Automatically determine modulation waveform for environmental baseline, utilize pattern-recognition and expert system technology, pass through great deal of laboratory tests, discovery is for the signal of the second harmonic that obtains, can extract the feature directly related with modulating wave, according to these features, utilize heuristic search algorithm, can determine the optimal modulation parameter under certain modulating wave type, even if under the situation that still can not meet the demands like this, the type modulation of modulating wave can be arrived under certain type, then according to the feature of second harmonic signal, in the knowledge base of expert system, carry out pattern match, thereby obtain being fit to the modulating wave type of this feature, carry out the optimization setting of each modulation parameter then again.
Can carry out simultaneously many components pollutant analysis of at least two kinds in real time.
Above-mentioned intelligent generation of modulation wave by wide band method comprises (1) graphic user interface, (2) open shell script, (3) figure preview, (4) modularization modulation waveform generates hardware, (5) modulated light wave produces software flow, (6) intelligent modulation waveform Autocad.
But described graphic user interface parameter input and demonstration comprise (1) first-harmonic and select (2) modulating wave to select, the selection of (3) hardware parameter, and (4) application choice, (5) display script is selected, (6) waveform preview.
First-harmonic has first-harmonic commonly used in selecting, and comprises (1) sawtooth wave, (2) step ripple, (3) triangular wave, (4) sine wave.
Can also select by self-defined waveform during first-harmonic is selected, can independently select or exploratory selection.
Setting to first-harmonic comprises: (1) amplitude lower bound 1, (2) amplitude upper bound 1, (3) amplitude lower bound 2, (4) amplitude upper bound 2.(5) realize the step position that two amplitudes are jumped.
Described modulation waveform selects to comprise (1) frequency of modulated wave, (2) amplitude.
Described hardware parameter selects (1) waveform to count can be to a high-profile, and (2) sweep frequency is optional.
Application choice can be imported and comprise the measured object title.
Described display script program is opened to the user.
Described waveform preview is by the preview simultaneously of designed waveform parameter, so that check, adjust, correct the parameter that is provided with.
Wherein open shell script be in being familiar with instructions shell script write agreement after, can be directly on shell script autonomous incoming wave shape parameter, after writing input parameter and finishing, automatically waveform parameter is sent into preview simultaneously among the RAM of computing machine.
Described wherein modularization modulation waveform generates hardware configuration, comprise that first-harmonic and modulating wave two tunnel modulation waveforms generate hardware, send address distributor and logic control circuit by computer software and peripheral logical circuit, the data-carrier store of control two-way and the work of D/A converter, every road is equipped with the address generator addressing of being sent into by computing machine, every road is equipped with the data-carrier store of being sent into by CPU, its input, the output two ends are equipped with the data isolation device, yet data are sent into high-precision d/a converter separately one by one and sent into level converter, together send into laser instrument control module outside this hardware configuration through the two paths of signals behind the level converter, drive tunable laser and produce modulated light wave.
Described modulated light wave produces software flow, modulation waveform produces flow process: produce before the modulating wave, software at first detects hardware, if normally then carry out the syntax check of modulation waveform script, after syntax check is passed through, among the RAM with the various parameters storage that is provided with in the script, simultaneously the waveform number that produces modulation waveform is counted parsing, thereby can access each data point value corresponding, check then whether these numerical value are legal, whether surpassed the highest frequency of hardware as the hardware scanning frequency that is provided with, whether the numerical value of output has surpassed maximum output area of hardware or the like.After all satisfy condition, software writes the voltage value of all some correspondences among the RAM of hardware module, and the clock in the startup hardware module, hardware module scans the data among its RAM according to the sweep frequency of setting, whenever scan data, just carry out D/A switch, thus the modulation waveform that output is set.In whole process, in case mistake occurs, software will produce error reporting, the prompting user.
The Autocad of described intelligent modulation waveform, this software can be clicked by the last preview item that is provided with of shell script, also can not import the modulation waveform parameter, in the purposes hurdle of graphic user interface, click after the input purposes, all can enter this program, after this program of entering, promptly break away from master routine, and the mark sheet of each time of taking-up test data sheet from knowledge base, carry out correlativity relatively with this input waveform or purposes, be arranged in order out identical by correlative character, approximate and questions record uncorrelated test data sheet, the user can have access to each test data sheet details arbitrarily, if further require Pre-Evaluation, this software can provide the Pre-Evaluation result, finishes to get back to master routine at last.
The Autocad of described intelligent modulation waveform is characterized in that taking principle of non-intervention.
The analytical approach of described intelligent second harmonic is called condition Adaptive Modulation waveform generation software, its flow process carries out first-harmonic for (1) user and modulating wave tentatively is provided with, (2) spectral signal obtains, (3) the 2F signal characteristic to spectrum extracts, (4) utilize heuristic search algorithm to determine best modulating frequency and modulation amplitude, do (5) judge that spectrum 2F signal satisfies the retrieving concentration requirement? if (6) enter real-time measurement state; (7) change the modulating wave type into default standard modulation type if not, and (8) carry out pattern match to the feature of spectrum 2F signal in knowledge base, determine new modulation first-harmonic and modulating wave, turn back to (2) spectral signal and obtain.
Described intelligent second harmonic analytical approach is characterized in that it being intelligent second harmonic analysis by Linearization method.
Intelligent second harmonic analysis by Linearization method is characterized in that linearizing integral multiple analytical approach.
Tunable laser is a semiconductor laser with tunable.
The modularization modulation waveform generates hardware configuration, it is characterized in that the hardware module of modulated light wave, can be thick film circuit or extensive integrated package.
Effect of the present invention:
Semiconductor laser with tunable intelligent modulation light wave and second harmonic spectroscopic analysis methods are the hardware design that has made full use of the virtual instrument technique functional module, advanced ideas such as software function open by design, not only whole modulation technique has been integrated in the computing machine, install in the field of being convenient to system, debugging, for providing widely, the user selects simultaneously, software carries out the wavelength-modulated parameter adjustment according to environmental baseline automatically, particularly in the adjustment of free waveform, can use for reference the use experience of past people, in inverting, also use heuristic search algorithm and pattern match to carry out modulation waveform and revised again.Make total system be easy to debugging, need not manual intervention too much, simplified operating process, be fit to user's requirement more, in addition, software automatically to the adjustment of wavelength-modulated parameter based on the retrieving concentration algorithm, make that like this result of monitoring is more reliable, reading is more accurate.Because this technology is to utilize tunable infrared laser technology to carry out the core technology of motor-vehicle tail-gas on-line monitoring, it improves rational technical scheme, for the final realization and the industrialization of tail gas on-line monitoring lays a solid foundation.
Description of drawings
Fig. 1 is for withering humorous semiconductor laser spectrometer general structure synoptic diagram.
Fig. 2 is the system waveform generator hardware configuration synoptic diagram that withers.
Fig. 3 is provided with graphic user interface figure for the system waveform that withers.
Fig. 4 is the system oscillogram of withering.
Fig. 5 is the system waveform generation software flow pattern that withers.
Fig. 6 is the humorous detection principle schematic of secondary figure.
Fig. 7 for the environmental baseline self-adaptation wither the system waveform determine software flow pattern.
Embodiment
Referring to accompanying drawing, wherein 1, computing machine, 2, pci bus, 3, control signal, 4, modulation module, 5, detector, 6, tunable optical source, 7, the photoelectricity harvester, 8, graphic user interface software, 9, secondary wave analysis frequently software.10, Control Software and other, 11, the laser instrument control module, 12, level converter, 13, logic control circuit, 14, A/D converter, 15, the data isolation road, 16, data-carrier store, 17, address generator, 18, address distributor, 19, hardware check, 20, success, 21, the syntax check of waveform script, 22, by, 23, controlled variable storage and preview and modulation waveform function are resolved, 24, the parameter validity checking, 25, by? 26, all data are write among the RAM of hardware module 27, produce error reporting and notify the user, 28, according to the hardware clock sweep frequency that is provided with, the quick D/A switch that starts hardware module produces modulation waveform, 29, the user carries out first-harmonic and modulating wave tentatively is provided with, and 30, spectral signal obtains, 31, extraction to the 2F signal characteristic of spectrum, 32, utilize heuristic search algorithm to determine best modulating frequency and modulation amplitude, 33, does spectrum 2F signal satisfy the retrieving concentration requirement? 34, enter real-time monitoring state, 35, in knowledge base, the feature of spectrum 2F signal is carried out pattern match, 36, determine new modulation first-harmonic and modulating wave, 37, change the modulating wave type into default standard modulation type.
Tunable laser intelligent modulation light wave of the present invention and 2F spectroscopic analysis methods, it is the modulated light wave of semiconductor laser with tunable outgoing, implement in the spectroanalysis instrument that limit, road pollutant of vehicle exhaust is monitored in real time, simultaneously carbon monoxide, carbon dioxide and flue dust are carried out many components and measure.
The production method of intelligent modulated light wave comprises (1) graphic user interface, (2) open shell script, (3) figure preview, (4) modularization modulation waveform generates hardware, (5) modulated light wave produces software flow, (6) intelligent modulation waveform Autocad.
But described graphic user interface parameter input and demonstration (referring to Fig. 3) comprise (1) first-harmonic and select (2) modulating wave to select, the selection of (3) hardware parameter, and (4) application choice, (5) display script is selected, (6) waveform preview.
First-harmonic has first-harmonic commonly used in selecting, and comprises (1) sawtooth wave, (2) step ripple, (3) triangular wave, (4) sine wave.
There is self-defined waveform to select during first-harmonic is selected, can independently selects or exploratory selection.
Described modulation waveform is selected to comprise (1) lower bound 1, (2) upper bound 1, (3) lower bound 2, (4) upper bound 2, (5) step position, (6) frequency of modulated wave, (7) amplitude.
It is adjustable that described hardware parameter selects (1) waveform to count, and (2) sweep frequency is optional.
Described display script program is opened to the user.
Described waveform preview is by the preview simultaneously of designed waveform parameter, so that check, adjust, correct the parameter that is provided with.
Wherein open shell script be in being familiar with instructions shell script write agreement after, can be directly on shell script autonomous incoming wave shape parameter, after writing input parameter and finishing, automatically waveform parameter is sent into preview simultaneously among the RAM of computing machine (1).
The Autocad of intelligent modulation waveform, this software can be clicked by the last preview number of times item that is provided with of shell script, also can not export the modulation waveform parameter graphic user interface the purposes hurdle in input click after the purposes, all can enter this program, after this program of entering, promptly break away from master routine, and the mark sheet of each time of taking-up test data sheet from knowledge base, carry out correlativity relatively with this input waveform or purposes, be arranged in order out identical by correlative character, approximate and questions record uncorrelated test data sheet, the user can have access to each test data sheet details arbitrarily, if further require Pre-Evaluation, this software can provide the Pre-Evaluation result, finishes to get back to master routine at last.
Send address distributor 18 and logic control circuit 13 by computer software and peripheral logical circuit 1, the data memory 16 of control two-way and D/A converter 14 work, every road is equipped with address generator 17 addressings of being sent into by computing machine 1, every road is equipped with data memory 16, its input, the output two-way all has data isolation device 15, then data are progressively sent into high-precision d/a converter 14 separately, and send into level converter 12, the laser instrument control module of together sending into outside this hardware configuration through the two paths of signals after the level conversion 11 drives tunable semiconductor device 6 generation modulated light waves.
Modulation waveform produces software flow pattern, at first if hardware check 19 is success, enter waveform script syntax check 21, after checking, controlled variable is stored in while modulation waveform function among the RAM, carry out the ripple line function and resolve 23, carry out the legal inspection 24 of parameter then, the maximum output area that whether has surpassed hardware as the hardware scanning frequency that is provided with, after the legal inspection of parameter is passed through, data are write among the RAM16 of hardware module, and the clock in the startup hardware module, address distributor 18 and logic controller 13 hardware modules scan the data among its RAM16 according to the sweep frequency of setting and whenever scan data, thereby just carry out the modulation waveform 28 that D/A switch 14 outputs are set, in whole process, in case mistake occurs, software will produce error reporting and notify user 27.
The analytical approach of described intelligent second harmonic is called condition Adaptive Modulation waveform generation software, its flow process is: 29, the user carries out first-harmonic and modulating wave tentatively is provided with, 30, spectral signal obtains, 31, the 2F signal characteristic to spectrum extracts, 32, utilize heuristic search algorithm to determine best modulating frequency and modulation amplitude, 33, judge that spectrum 2F signal satisfies the retrieving concentration requirement, if, 34, enter real-time measurement state; If not, 36, change the modulating wave type into default standard modulation type, 35, in knowledge base, the feature of spectrum 2F signal is carried out pattern match, determine new modulation first-harmonic and modulating wave, turn back to 30 spectral signals and obtain.
Claims (8)
1, tunable laser spectrum second harmonic intelligent analysis method, it is characterized in that having earlier the generation of intelligent modulation waveform, carry out the analysis of second harmonic again, 1., graphic user interface modulating wave produces and to comprise specifically:, 2., self-defined waveform is selected, 3., open shell script, 4., modulating wave produces software flow; The analysis of second harmonic specifically is that condition Adaptive Modulation ripple produces software flow.
2, the device for carrying out said of tunable laser spectrum second harmonic intelligent analysis method according to claim 1, comprise optical system, the spectra collection device, PC computing machine and interface, it is characterized in that the modularization modulation waveform generates hardware, it has comprised that the two-way modulation waveform generates hardware, send address distributor and logic control circuit by computer software and peripheral logical circuit, the data-carrier store and the D/A converter work of control two-way, every road is equipped with the address generator addressing of being sent into by computing machine, every road is equipped with the data-carrier store of being sent into by CPU, its input, the output two ends are equipped with the data isolation device, data are sent into high-precision d/a converter separately one by one and are sent into level converter then, together send into laser instrument control module outside this hardware configuration through the two paths of signals behind the level converter, drive tunable laser and produce modulated light wave.
3, tunable laser spectrum second harmonic intelligent analysis method according to claim 1 is characterized in that graphic user interface can provide parameter input and demonstration, specifically comprises:
A, select first-harmonic commonly used, comprising: 1., sawtooth wave 2., the step ripple 3., triangular wave 4., sine wave;
B, modulation waveform select to comprise: 1., modulating frequency 2., modulation amplitude;
C, hardware parameter select to comprise: 1., the data point array become adjustable 2., the hardware scanning optional frequency;
D, application choice: can set detected contaminant component and quantity;
E, provide the modulation waveform preview interface, conveniently check modulation and correct the parameter that is provided with.
4, tunable laser spectrum second harmonic intelligent analysis method according to claim 3 is characterized in that first-harmonic has self-defined waveform to select in selecting, and can independently select and exploratory selection.
5, tunable laser spectrum second harmonic intelligent analysis method according to claim 1, it is characterized in that wherein open shell script be in being familiar with instructions shell script write agreement after, can independently write the Waveform Control script, script through compile errorless after, the Waveform Control parameter deposits in the computing machine automatically, and waveform the preview window is provided simultaneously.
6, tunable laser spectrum second harmonic intelligent analysis method according to claim 1, it is characterized in that described modulating wave produces software flow and is: produce before the modulating wave, software at first detects hardware, if it is normal, then carry out the syntax check of modulation waveform script, after syntax check is passed through, the various parameters that are provided with in the script are stored among the RAM, simultaneously the wave function that produces modulation waveform being carried out function resolves, thereby can access each data point value corresponding, check then whether these numerical value are legal, after all satisfy condition, software writes the voltage value of all some correspondences among the RAM of hardware module, and the clock in the startup hardware module, hardware module scans the data among its RAM according to the sweep frequency of setting, and whenever scans data, just carry out D/A switch, thus the modulation waveform that output is set.
7, tunable laser spectrum second harmonic intelligent analysis method according to claim 1, it is characterized in that described condition Adaptive Modulation waveform generation software, its flow process is: 1., the user carries out first-harmonic and modulating wave tentatively is provided with, 2., spectral signal obtains, 3., 2F signal characteristic to spectrum extracts, 4., utilize heuristic search algorithm to determine best modulating frequency and modulation amplitude 5., judge whether spectrum 2F signal satisfies the retrieving concentration requirement, if, 6., enter real-time measurement state, if not, 7., change the modulating wave type into default standard modulation type, 8., in knowledge base, the feature of spectrum 2F signal is carried out pattern match, determine new modulation first-harmonic and modulating wave, turn back to 2..
8, the device for carrying out said of tunable laser spectrum second harmonic intelligent analysis method according to claim 2 is characterized in that the tunable laser that is adopted is a tunable diode laser.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101852612A (en) * | 2010-03-25 | 2010-10-06 | 西北工业大学 | Centering device for slow-wave structure and disturbing rod |
| CN102997058A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Light source system of natural gas pipe leakage optical fiber monitoring system |
| CN104729706A (en) * | 2015-03-02 | 2015-06-24 | 高利通科技（深圳）有限公司 | Display method and system for spectrum data |
| CN107516420A (en) * | 2016-06-17 | 2017-12-26 | 北京利和顺达电子有限公司 | Can auto-real-time monitoring vehicular traffic exhaust emissions device and appraisal procedure |
| CN113361389A (en) * | 2021-06-03 | 2021-09-07 | 山东阅芯电子科技有限公司 | Method for processing high-frequency oscillation characteristics of signal |
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| CN101876637B (en) * | 2009-04-29 | 2012-02-22 | 北京路捷仪器有限公司 | Method for designing structure of modularized analytical instrument system |
| CN101915737B (en) * | 2010-08-03 | 2012-07-04 | 武汉科技大学 | Detection instrument for detecting concentration of CO gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101852612A (en) * | 2010-03-25 | 2010-10-06 | 西北工业大学 | Centering device for slow-wave structure and disturbing rod |
| CN101852612B (en) * | 2010-03-25 | 2012-07-04 | 西北工业大学 | Centering device for slow-wave structure and disturbing rod |
| CN102997058A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Light source system of natural gas pipe leakage optical fiber monitoring system |
| CN104729706A (en) * | 2015-03-02 | 2015-06-24 | 高利通科技（深圳）有限公司 | Display method and system for spectrum data |
| CN107516420A (en) * | 2016-06-17 | 2017-12-26 | 北京利和顺达电子有限公司 | Can auto-real-time monitoring vehicular traffic exhaust emissions device and appraisal procedure |
| CN113361389A (en) * | 2021-06-03 | 2021-09-07 | 山东阅芯电子科技有限公司 | Method for processing high-frequency oscillation characteristics of signal |
| CN113361389B (en) * | 2021-06-03 | 2023-01-20 | 山东阅芯电子科技有限公司 | Method for processing high-frequency oscillation characteristics of signal |
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