CN109916831B - Method and system for reducing false alarm rate of data of laser gas telemeter - Google Patents
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The invention relates to the technical field of laser telemetering, in particular to a method and a system for reducing the false alarm rate of data of a laser gas telemeter. Wherein the method comprises the following steps: acquiring a standard signal spectrum waveform; acquiring an echo signal spectrum waveform; calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal; judging whether the echo signals are credible or not based on the similarity and generating a judgment result; and extracting a credible echo signal based on the judgment result and using the credible echo signal for detection result calculation. The system comprises a data acquisition unit, a signal processing unit, a judgment unit and an extraction unit, and executes the method. According to the invention, the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal is compared to judge whether the echo signal is credible, and the credible echo signal is adopted to calculate to obtain the detection result, so that the accuracy of the detection result is effectively improved, and the false alarm rate of the data of the laser gas telemeter is reduced.
Description
Technical Field
The invention relates to the technical field of laser telemetering, in particular to a method and a system for reducing the false alarm rate of data of a laser gas telemeter.
Background
The laser gas telemeter is a device which takes laser as a main means and realizes remote sensing detection at a long distance. Laser gas telemeters are commonly used to determine atmospheric pollution, such as the concentration of a contaminant. Gas concentration measurement by reflection echo is a common way of gas telemetry. The light emitted by the light source irradiates the area to be measured through collimation, the reflected echo generated after the light beam is reflected returns to the photoelectric detector of the remote measuring device, and the concentration value of the target gas can be calculated by measuring the absorption of the reflected echo by the target gas on the path. The laser gas telemeter does not need to sample on site, can detect the concentration of pollutants on site in real time, and can detect the concentration of methane on site if the laser methane telemeter can judge whether natural gas leaks or determine the position of the leaking source. In addition, the laser gas telemeter also has the advantages of high speed, high sensitivity, high safety and the like.
However, in practical applications, the laser gas telemeter may be affected by changes in detection environmental conditions, saturation of a detector, or circuit switching, and the like, thereby causing a data false alarm phenomenon. For example, when sunlight in the detected ambient light or the received reflected light changes drastically, the echo signal obtained by the laser gas telemeter is often distorted, and such distortion may cause an error in the measurement result and a false signal.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a method and a system for reducing the false alarm rate of laser gas telemeter data, which can prevent the laser gas telemeter from being affected by environmental condition changes.
The specific technical scheme of the invention is as follows:
in a first aspect, the present invention provides a method for reducing the false alarm rate of data of a laser gas telemeter, comprising:
acquiring a standard signal spectrum waveform;
acquiring an echo signal spectrum waveform;
calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal;
judging whether the echo signals are credible or not based on the similarity and generating a judgment result;
and extracting a credible echo signal based on the judgment result and using the credible echo signal for detection result calculation.
In a second aspect, the present invention provides a system for reducing the false alarm rate of data of a laser gas telemeter, comprising:
a data acquisition unit configured to acquire a standard signal spectrum waveform and acquire an echo signal spectrum waveform;
a signal processing unit configured to calculate a similarity of the echo signal spectral waveform and the standard signal spectral waveform;
a judging unit configured to judge whether the echo signal is authentic based on the similarity and generate a judgment result;
an extraction unit configured to extract a reliable echo signal based on the determination result and use it for detection result calculation.
The detection result comprises data such as gas concentration and the like.
In a third aspect, the present invention provides a laser gas telemeter apparatus comprising: the laser comprises a laser, a controller, a memory and a processor, wherein the memory is stored with at least one instruction, at least one section of program, a code set or an instruction set, and the at least one instruction, the at least one section of program, the code set or the instruction set is loaded and executed by the processor to realize the method for reducing the data false alarm rate of the laser gas telemeter.
By adopting the technical scheme, the method and the system for reducing the false alarm rate of the laser gas telemeter data have the following beneficial effects:
according to the invention, the similarity comparison is carried out on the spectrum waveform of the echo signal and the spectrum waveform of the standard signal, whether the echo signal is credible or not is judged according to the similarity value, and the detection result is obtained by adopting the credible echo signal for calculation. By utilizing the technical scheme provided by the invention, the accuracy of the detection result can be improved, the signal distortion caused by signal saturation, circuit switching and/or severe change of environmental conditions is avoided, and the data false alarm rate of the laser gas telemeter is effectively reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a laser gas telemeter apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for reducing the false alarm rate of data of a laser gas telemeter according to an embodiment of the present invention;
FIG. 3 is a set of standard signal spectral waveforms (FIG. 3a) and echo signal spectral waveforms (FIG. 3 b-FIG. 3i) obtained under ambient strong light interference provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the division of characteristic regions of a standard signal spectrum waveform according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the division of characteristic regions of a spectrum waveform of another standard signal according to an embodiment of the present invention;
FIG. 6 is a diagram of another set of echo signal spectral waveforms (FIGS. 6 a-6 d) provided by an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a system for reducing the false alarm rate of laser gas telemetry instrument data according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a laser gas telemeter device according to an embodiment of the present invention, and as shown in fig. 1, the device may include a laser, a signal detector, a display, a controller, a memory, a processor, and the like. Communication means may also be included. The processor may include a spectrum analyzer, a signal detection processor, and the like. The apparatus may be provided with a distance measuring device and a gas sensing device.
It should be noted that the above-mentioned device may be a device that can be used alone, such as a handheld laser methane telemeter, or may be a device that can be integrated with other devices for use, such as a laser methane telemeter that can be integrated with a vehicle, an unmanned aerial vehicle, or a ship.
In practical applications, the Laser in the above-mentioned apparatus may be a Tunable Diode Laser, and the above-mentioned apparatus may be based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology for gas concentration detection.
The method for reducing the data false alarm rate of the laser gas telemeter based on the above-mentioned equipment is introduced below, and fig. 2 is a flow diagram of the method for reducing the data false alarm rate of the laser gas telemeter provided by the embodiment of the present invention. The present specification provides method steps as described in the examples or flowcharts, but may include more or fewer steps based on routine or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. In practice, the system or apparatus may be implemented in the form of a sequence of steps or in parallel as the method proceeds according to the embodiments or as shown in the drawings. Specifically, as shown in fig. 2, the method may include:
s100, acquiring a standard signal spectrum waveform;
in an embodiment of the present description, an apparatus or system for performing the method of the present description may be pre-stored with a standard signal spectrum waveform, which may be a test result obtained under a standard set of experimental conditions. Or selecting an environment meeting standard conditions in a detection field, and taking the acquired echo signal spectrum waveform as a standard signal spectrum waveform. For example, in the environment of the detection site, the environment range without the gas to be detected is selected, and the echo signal spectrum waveform is obtained by adopting the standard reflection surface and is used as the standard signal spectrum waveform.
In practical applications, if the standard signal spectrum waveform is pre-stored, more than one standard signal spectrum waveform may be pre-stored, for example, a standard signal spectrum waveform obtained under indoor lighting-free conditions, a standard signal spectrum waveform obtained under urban outdoor air conditions, and the like may be stored.
S200, acquiring an echo signal spectrum waveform;
in the embodiment of the present disclosure, the echo signal spectrum waveform is an echo signal generated by reflecting a laser beam by a reflecting surface after the laser beam is absorbed by a gas to be measured in an environment, and the echo signal is sampled to obtain an echo signal spectrum waveform.
In the embodiments of the present disclosure, the spectrum waveform of the echo signal may be distorted due to environmental factors in the field of detection, including but not limited to, severe changes in ambient light and/or severe changes in the received reflected light. For example, in outdoor detection environments where the sunlight is drastically changed, the reflection surface at the detection site has a different reflectance or the reflection surface has a different reflection angle from the laser beam, and the like.
Fig. 3 is a set of standard signal spectrum waveforms (fig. 3a) and echo signal spectrum waveforms (fig. 3 b-fig. 3i) obtained under the interference of the ambient strong light (the warmer simulates the strong light source), and referring to fig. 3, the echo signal spectrum waveforms (fig. 3 b-fig. 3i) are obviously distorted and have poor similarity with the standard signal spectrum waveforms compared with the standard signal spectrum waveforms (fig. 3 a).
S300, calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal;
in the embodiments of the present specification, the similarity calculation formula is as follows:
wherein, x is the longitudinal coordinate value of a certain sampling point in the standard signal spectrum waveform, y is the longitudinal coordinate value of the same sampling point in the echo signal spectrum waveform, x0Is the average value of the ordinate of all sampling points in all or a certain area range of the standard signal spectrum waveform, y0For the spectral wave of an echo signalAverage value r of ordinate of all sampling points in all or a certain area range corresponding to standard signal spectrum waveformxyFor similarity of the spectrum waveform of the echo signal and the spectrum waveform of the standard signal
S400, judging whether the echo signals are credible or not based on the similarity and generating a judgment result;
in the embodiment of the present specification, after obtaining the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal, determining whether the similarity is lower than a similarity threshold; if so, determining that the echo signal is not credible, and discarding the echo signal; and if not, determining that the echo signal is credible.
In a specific embodiment, the similarity between the spectrum waveform of the echo signal obtained under the strong light interference of the surrounding environment in fig. 3 and the standard spectrum waveform is obtained according to the above formula, and the spectrum corresponding to fig. 3 b-3 i is determined as a distorted spectrum, that is, the echo signal corresponding to fig. 3 b-3 i is not trusted.
And S500, extracting a credible echo signal based on the judgment result and using the credible echo signal for detection result calculation.
In the embodiment of the present specification, it may be set that the echo signal whose similarity value is equal to or greater than the similarity threshold value is extracted to calculate the detection result.
In practical application, the spectrum waveform of the echo signal received by each detection and the standard spectrum waveform are subjected to correlation operation to obtain a series of similarity results, and the credible echo signal and the incredible echo signal can be distinguished according to the comparison between the results and the set similarity threshold. And further, the incredible echo signals are abandoned, and the credible echo signals are selected to calculate the detection result (the detection result comprises data such as gas concentration), so that the accuracy of the test is improved. The method can avoid signal distortion or distortion caused by signal saturation, circuit switching, drastic change of environmental conditions (such as light rays) and the like, and effectively reduce the false alarm rate of data.
In practical applications, the similarity threshold is preferably in the range of 0.85-0.95.
In some embodiments of the present specification, step S300 may specifically include:
s310, determining a characteristic region according to the standard signal spectrum waveform;
in the embodiments of the specification, the characteristic region is a sampling point range in which the standard signal spectrum waveform does not include the absorption of the gas to be measured and the environmental interference gas. For example, in the case that the gas to be measured is methane, the characteristic region is that methane and environmental interference gas (such as water vapor and CO) are not included in the standard signal spectrum waveform2Etc.) the range of sample points for absorption. For tunable diode lasers, the drive current is related to the laser output wavelength and light intensity (standard signal spectrum waveform is obtained under the condition of given drive current, and the sampling point is related to the wavelength), the absorption wavelength of methane and environmental interference gas (such as water vapor, CO2 and the like) is known, and the sampling point range excluding the absorption of methane and environmental interference gas (such as water vapor, CO2 and the like) is selected as a characteristic region.
It should be noted that the characteristic region range may include a plurality of regions, and the region range may be dispersed or continuous.
And S320, calculating the similarity between the spectrum waveform of the echo signal in the characteristic region and the spectrum waveform of the standard signal.
In the embodiment of the present specification, in the above-mentioned similarity calculation formula, x and y have the same meanings as above, and x is0Is the average value y of the ordinate of all sampling points in the characteristic region of the standard signal spectrum waveform0The average value of the ordinate of all sampling points in the characteristic region of the spectrum waveform of the echo signal is obtained.
Further, in some embodiments of the present specification, the step S310 may specifically include:
s311, determining the boundary point of the characteristic region;
and setting the distance between the first boundary point and the reference point according to the full width of the absorption spectrum line of the gas to be detected and setting the second boundary point according to actual calculation requirements.
S312, determining a characteristic region according to the boundary points;
the range between the first boundary point and the second boundary point is the characteristic region.
In fact, the number of feature regions is usually n, where n is a positive integer greater than or equal to 1.
Therefore, the characteristic region is determined, the sampling points are preliminarily screened, the total quantity of the sampling points for correlation calculation is reduced, the calculation amount of correlation calculation is reduced, the calculation time is greatly shortened, the time cost is saved, and the requirement on hardware is reduced.
In one embodiment, referring to fig. 4, the two boxes in fig. 4 define a specific region of the standard signal spectrum waveform. Specifically, a reference point corresponding to an absorption peak of the gas to be detected is S, the standard signal spectrum waveform includes two characteristic regions in one current driving period, and a vertical coordinate of the standard signal spectrum waveform represents light intensity. The corresponding sampling point of the first characteristic area is 0-300, namely the sampling point corresponding to the first boundary point A is 0, the sampling point corresponding to the second boundary point B is 300, and the whole light intensity of the area is weaker; the second characteristic region corresponds to the sampling points 1300-1800, i.e., the sampling point corresponding to the third boundary point C is 1300, the sampling point corresponding to the fourth boundary point D is 1800, and the overall light intensity of the region is stronger. And taking the first characteristic region and the second characteristic region as characteristic regions. And taking the sampling points in the characteristic region as sampling points for calculating the similarity.
In one embodiment, samples 0-300 and sample 1300-1800 are based on the characteristic regions determined from the standard signal spectral waveform of FIG. 4 above. According to the similarity calculation formula, x is the ordinate (light intensity) value of a certain sampling point in the standard signal spectrum waveform, y is the ordinate (light intensity) value of the same sampling point in the echo signal spectrum waveform and the standard signal spectrum waveform, and x0Is the average value y of the ordinate (light intensity) of 800 sampling points in the characteristic region in the standard signal spectrum waveform0The average value of the ordinate of 800 sampling points in the characteristic area in the spectrum waveform of the echo signal is obtained.
In another embodiment, referring to fig. 5, the portion enclosed by the two boxes in fig. 5 is a characteristic region determined on the standard signal spectrum waveform, specifically, the first reference point corresponding to the absorption peak of the gas to be measured is S1The second reference point is S2. The sampling points corresponding to the first boundary point a ', the second boundary point B', the third boundary point C 'and the fourth boundary point D' are 500, 700, 1000 and 1300 respectively, i.e. the sampling point range corresponding to the first characteristic region is 500-. And taking the sampling points in the first characteristic region and the second characteristic region as sampling points for calculating the similarity.
Based on the above specific embodiments, in some embodiments of the present specification, the characteristic region may include a region where the light intensity on the spectral waveform changes drastically, for example, a curve bending point or a curve inflection point.
In this embodiment, the similarity threshold is determined to be 0.9 through experimental verification. Further, referring to fig. 6, according to the similarity calculation formula described above and the feature region determined in fig. 4, the similarities between the spectrum waveforms of the echo signals in fig. 6a to 6d and the spectrum waveforms of the standard signals in fig. 4 are sequentially: 0.999, 0.985, 0.8 and 0.7. Therefore, the echo signals corresponding to fig. 6a and 6b are determined to be credible for detection result calculation; the echo signals corresponding to fig. 6c and 6d are not trusted and are discarded.
The following introduces a system for reducing the false alarm rate of data of a laser gas telemeter based on the above-mentioned device, fig. 7 is a schematic structural diagram of the system for reducing the false alarm rate of data of a laser gas telemeter according to an embodiment of the present invention, and with reference to fig. 7, the system may include:
a data acquisition unit 10 configured to acquire a standard signal spectrum waveform and acquire an echo signal spectrum waveform;
a signal processing unit 20 configured to calculate a similarity of the echo signal spectrum waveform and the standard signal spectrum waveform;
a judging unit 30 configured to judge whether the echo signal is authentic based on the similarity and generate a judgment result;
an extraction unit 40 configured to extract a reliable echo signal based on the determination result and use it for detection result calculation.
Further, in some embodiments, the signal processing unit 20 may include:
an analysis module configured to determine a characteristic region from the standard signal spectral waveform;
an algorithm module may be configured to calculate a similarity of the echo signal spectral waveform and the standard signal spectral waveform within the feature region.
In particular, in some embodiments, the algorithm module may be configured to calculate the equation from the phase
Calculating the similarity;
wherein x is the ordinate value of a certain sampling point in the standard signal spectrum waveform, y is the ordinate value of the same sampling point in the echo signal spectrum waveform as the standard signal spectrum waveform, and x0Is the average value y of the ordinate of all sampling points in the characteristic region of the standard signal spectrum waveform0The average value of the ordinate of all sampling points in the characteristic region of the spectrum waveform of the echo signal is obtained.
Further, in some embodiments, the analysis module may be further configured to:
and determining the range of sampling points on the standard signal spectrum waveform, which does not include the absorption of the gas to be detected and the environmental interference gas, as a characteristic region, wherein the number of the characteristic regions is n, and n is a positive integer greater than or equal to 1. Further, in some embodiments, the determining unit 30 may be configured to determine whether the similarity is lower than a similarity threshold;
if so, determining that the echo signal is not credible, and discarding the echo signal;
and if not, determining that the echo signal is credible.
The method, the system or the equipment for reducing the false alarm rate of the laser gas telemeter data can be seen from the embodiment of the method, the system or the equipment for reducing the false alarm rate of the laser gas telemeter data, the similarity comparison is carried out on the spectrum waveform of the echo signal and the spectrum waveform of the standard signal, whether the echo signal is credible or not is judged according to the similarity value, and the detection result is obtained by adopting the credible echo signal for calculation. By utilizing the technical scheme provided by the embodiment of the specification, the accuracy of the detection result can be improved, signal distortion caused by signal saturation, circuit switching and/or severe change of environmental conditions is avoided, and the data false alarm rate of the laser gas telemeter is effectively reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A method for reducing the false alarm rate of data of a laser gas telemeter is characterized by comprising the following steps:
acquiring a standard signal spectrum waveform, wherein the standard signal spectrum waveform is a test result obtained under a standard set experimental condition, or an echo signal spectrum waveform obtained by selecting an environment meeting the standard condition in a detection field;
acquiring an echo signal spectrum waveform, wherein the echo signal spectrum waveform is obtained after sampling an echo signal generated by reflecting a reflecting surface after laser is absorbed by gas to be detected in the environment;
calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal; the calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal comprises: determining a characteristic region according to the standard signal spectrum waveform; calculating the similarity between the spectrum waveform of the echo signal in the characteristic region and the spectrum waveform of the standard signal;
judging whether the echo signals are credible or not based on the similarity and generating a judgment result;
and extracting a credible echo signal based on the judgment result and using the credible echo signal for detection result calculation.
2. The method according to claim 1, wherein the similarity is calculated by the formula:
wherein, x is the longitudinal coordinate value of a certain sampling point in the standard signal spectrum waveform, y is the longitudinal coordinate value of the same sampling point in the echo signal spectrum waveform, x0Is the average value y of the ordinate of all sampling points in the characteristic region of the standard signal spectrum waveform0Is the average value r of the ordinate of all sampling points in the characteristic region of the spectrum waveform of the echo signalxyAnd calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal.
3. The method of claim 1, wherein said determining a characteristic region from said standard signal spectral waveform comprises:
determining a sampling point range which does not comprise the absorption of the gas to be detected and the environmental interference gas on the standard signal spectrum waveform as a characteristic region;
the number of the characteristic regions is n, wherein n is a positive integer greater than or equal to 1.
4. The method of claim 1, wherein the determining whether the echo signal is authentic according to the similarity result and generating a determination result comprises:
judging whether the similarity is lower than a similarity threshold value;
if so, determining that the echo signal is not credible, and discarding the echo signal;
and if not, determining that the echo signal is credible.
5. A system for reducing the false alarm rate of data of a laser gas telemeter is characterized by comprising:
the data acquisition unit (10) is configured to acquire a standard signal spectrum waveform and an echo signal spectrum waveform, wherein the standard signal spectrum waveform is a test result obtained under a standard set experimental condition, or the echo signal spectrum waveform is acquired by selecting an environment meeting the standard condition in a detection field, and the echo signal spectrum waveform is obtained by sampling an echo signal generated by reflecting through a reflecting surface after laser is absorbed by gas to be detected in the environment;
a signal processing unit (20) configured to calculate a similarity of the echo signal spectral waveform and the standard signal spectral waveform; the signal processing unit (20) comprises: an analysis module configured to determine a characteristic region from the standard signal spectral waveform; an algorithm module configured to calculate a similarity of the echo signal spectral waveform and the standard signal spectral waveform within the feature region;
a judging unit (30) configured to judge whether the echo signal is authentic based on the similarity and generate a judgment result;
an extraction unit (40) configured to extract a reliable echo signal based on the determination result and use it for detection result calculation.
6. The system of claim 5, wherein the algorithm module is configured to calculate the similarity according to a formula;
wherein, x is the longitudinal coordinate value of a certain sampling point in the standard signal spectrum waveform, y is the longitudinal coordinate value of the same sampling point in the echo signal spectrum waveform, x0Is the average value y of the ordinate of all sampling points in the characteristic region of the standard signal spectrum waveform0Is the average value r of the ordinate of all sampling points in the characteristic region of the spectrum waveform of the echo signalxyAnd calculating the similarity between the spectrum waveform of the echo signal and the spectrum waveform of the standard signal.
7. The system of claim 5, wherein the analysis module is further configured to: determining a sampling point range which does not comprise the absorption of the gas to be detected and the environmental interference gas on the standard signal spectrum waveform as a characteristic region;
the number of the characteristic regions is n, wherein n is a positive integer greater than or equal to 1.
8. The system according to claim 5, wherein the determining unit (30) is configured to determine whether the similarity is below a similarity threshold;
if so, determining that the echo signal is not credible, and discarding the echo signal;
and if not, determining that the echo signal is credible.
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| CN112525857B (en) * | 2020-11-26 | 2023-09-05 | 合肥铜冠信息科技有限责任公司 | Multi-verification motor vehicle tail gas remote measuring device and verification method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198416A (en) * | 2014-09-15 | 2014-12-10 | 南京国电环保科技有限公司 | Real-time compensation method of measurement errors caused by spectrograph wavelength drift |
| CN105044026A (en) * | 2015-08-27 | 2015-11-11 | 安徽中科瀚海光电技术发展有限公司 | Laser methane concentration measuring method based on double-spectrum absorption line and waveform matching |
| CN108780038A (en) * | 2018-05-21 | 2018-11-09 | 深圳达闼科技控股有限公司 | Determine method, relevant apparatus and the storage medium of spectrometer calibration coefficient |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8345250B1 (en) * | 2009-11-02 | 2013-01-01 | Exelis, Inc. | System and method for detecting chemical species from a remote sensing platform |
| US8358417B2 (en) * | 2010-10-21 | 2013-01-22 | Spectrasensors, Inc. | Spectrometer with validation cell |
| CN109916831B (en) * | 2019-01-31 | 2020-08-14 | 上海禾赛光电科技有限公司 | Method and system for reducing false alarm rate of data of laser gas telemeter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198416A (en) * | 2014-09-15 | 2014-12-10 | 南京国电环保科技有限公司 | Real-time compensation method of measurement errors caused by spectrograph wavelength drift |
| CN105044026A (en) * | 2015-08-27 | 2015-11-11 | 安徽中科瀚海光电技术发展有限公司 | Laser methane concentration measuring method based on double-spectrum absorption line and waveform matching |
| CN108780038A (en) * | 2018-05-21 | 2018-11-09 | 深圳达闼科技控股有限公司 | Determine method, relevant apparatus and the storage medium of spectrometer calibration coefficient |
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