CN112904318A - Window pollution real-time monitoring device and method for laser sounding remote measurement system - Google Patents
Window pollution real-time monitoring device and method for laser sounding remote measurement system Download PDFInfo
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- CN112904318A CN112904318A CN202110139584.0A CN202110139584A CN112904318A CN 112904318 A CN112904318 A CN 112904318A CN 202110139584 A CN202110139584 A CN 202110139584A CN 112904318 A CN112904318 A CN 112904318A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 title claims abstract description 9
- 238000012806 monitoring device Methods 0.000 title description 5
- 239000005357 flat glass Substances 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000012937 correction Methods 0.000 claims abstract description 10
- 239000000356 contaminant Substances 0.000 claims abstract description 4
- 238000011109 contamination Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 9
- 238000000295 emission spectrum Methods 0.000 claims description 6
- 230000003595 spectral effect Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000002834 transmittance Methods 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims 2
- 238000004140 cleaning Methods 0.000 abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 239000003344 environmental pollutant Substances 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
Abstract
The invention discloses a device and a method for monitoring window pollution of a laser sounding remote measurement system in real time, wherein the system comprises window glass, an emission module, a photoelectric detection module, a temperature monitoring module, a power supply module, a time sequence control module and a digital signal processing module; the method comprises the following steps: the light emitting diode is controlled to emit a light beam; window glass and contaminants reflect or scatter light beams; the photoelectric detector receives the light beam and performs photoelectric conversion; amplifying the electric signal and performing analog-to-digital conversion, and simultaneously acquiring the ambient temperature by a temperature sensor; and after temperature drift correction and sky background noise correction are carried out, judging the window pollution condition. The device and the method can acquire real-time window pollution information, provide a trigger signal for a window self-cleaning device, correct temperature drift and sky background noise when window pollution conditions are judged, and are accurate in monitoring value, simple in structure, convenient to operate and high in practical value.
Description
Technical Field
The invention relates to the field of laser sounding telemetry, in particular to a device and a method for monitoring window pollution of a laser sounding telemetry system in real time.
Background
Laser sounding telemetry systems are widely used, typically: aerosol lidar, wind profile lidar, hyperspectral lidar and the like. The laser radar system can realize the detection of the space distribution conditions of atmospheric temperature, humidity, aerosol, carbon dioxide, gas pollutants and the like, and compared with the traditional measurement means, the laser remote measurement system has the advantages of non-contact, high time-space resolution, high measurement precision, low long-term operation cost, real-time continuous observation and the like, and has wide application prospect in the field of atmospheric environment monitoring.
The optical light-transmitting window glass of the laser sounding remote measuring system should be kept clean to prevent the efficiency of laser emission and echo signal reception from being reduced and the calibration constant of the system during quantitative measurement, but the laser sounding remote measuring system works in an outdoor environment for a long time, and substances such as sand, dust, snow and the like are attached to the upper surface of the window glass to cause the light transmittance of the window glass to be reduced and the calibration constant of the laser sounding remote measuring system to be changed. The window pollution condition is monitored in real time, a trigger signal can be provided for a window self-cleaning device, maintenance personnel are reminded of cleaning in time when self-cleaning is invalid, and the window self-cleaning device has high practical value.
Disclosure of Invention
The invention provides a device and a method for monitoring window pollution of a laser sounding remote measurement system in real time, which can monitor the window pollution condition in real time.
In order to achieve the purpose, the invention adopts the following technical scheme:
a real-time window pollution monitoring device of a laser sounding remote measuring system comprises window glass, an emission module, a photoelectric detection module, a temperature monitoring module, a power supply module, a time sequence control module and a digital signal processing module;
the window glass is optical light-transmitting window glass of the laser sounding remote measuring system;
the emission module is adjacent to the photoelectric detection module, and both the emission module and the photoelectric detection module are vertically arranged below the window glass;
the temperature monitoring module is arranged on one side of the transmitting module or the photoelectric detection module;
the transmitting module, the photoelectric detection module, the temperature monitoring module and the power supply module are all connected with the digital signal processing module and the time sequence control module.
Preferably, the emission module adopts a light emitting diode, and the light emitting diode emits ultraviolet light waves with narrow spectral width according to time sequence control.
Preferably, the photoelectric detection module adopts a photoelectric detector, and the response spectrum section of the photoelectric detector is matched with the emission spectrum section of the light-emitting diode and can respond to an echo signal reflected by the window glass; the photoelectric detector is provided with a band-pass filter, so that the light-emitting diode has high transmittance in the range of an emission spectrum of the light-emitting diode and has high rejection rate in other conventional spectrums.
Preferably, the photodetector is further provided with an amplifier and an analog-to-digital converter, and the amplifier and the analog-to-digital converter are used for sampling and amplifying the weak analog electrical signal after photoelectric conversion, and then performing analog-to-digital conversion.
Preferably, the digital signal processing module adopts a digital signal processor for processing the obtained data to obtain real-time window pollution data.
Preferably, the temperature monitoring module adopts a temperature sensor for acquiring the ambient temperature and transmitting the ambient temperature to the digital signal processing module.
A real-time monitoring method for window pollution of a laser sounding remote measuring system comprises the following steps:
the light emitting diode is controlled to emit a light beam;
window glass and contaminants reflect or scatter light beams;
the photoelectric detector receives the light beam and performs photoelectric conversion;
amplifying the electric signal and performing analog-to-digital conversion, and simultaneously acquiring the ambient temperature by a temperature sensor;
and judging the window pollution condition.
Preferably, in order to eliminate interference of daytime sky background noise, the photoelectric detector is used to work according to time sequence, on one hand, the photoelectric detector is synchronously started with the light emitting diode to collect all information superposed with reflected light, scattered light and sky background noise light, and on the other hand, the photoelectric detector works when the light emitting diode is completely turned off to only collect sky background noise information and is used for filtering sky background noise when window pollution is judged.
Preferably, in order to eliminate the change of the luminous efficiency and the spectral range of the light emitting diode and the change of the detection efficiency of the photoelectric detector caused by the change of the ambient temperature, the ambient temperature signal is acquired by the temperature sensor and is used for correcting the temperature drift of the signal.
Preferably, the determining of the contamination of the window includes:
when the window pollution does not exist, light beams emitted by the light emitting diode are reflected by the upper surface and the lower surface of the window glass, and part of reflected light is received by the photoelectric detector and converted into a group of analog electric signals with constant numerical values;
when window pollution exists, the attachment on the upper surface of the window glass generates a scattering effect on the emitted light beam, the scattered light of part of the attachment and the reflected light of the window glass are received by the photoelectric detector to generate a group of analog electric signals higher than that in the case of no window pollution, after temperature drift correction and sky background noise correction are carried out on the electric signals, the difference value between the electric signals and the electric signals in the case of no pollution represents the window pollution degree, and the larger the difference value is, the heavier the window pollution degree is.
Due to the structure, the invention has the advantages that:
the device and the method can acquire real-time window pollution information, provide a trigger signal for a window self-cleaning device, correct temperature drift and sky background noise when window pollution conditions are judged, and are accurate in monitoring value, simple in structure, convenient to operate and high in practical value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a schematic view of a real-time window contamination monitoring device of a laser sounding telemetry system according to the present invention;
fig. 2 is a working flow diagram of a window pollution real-time monitoring method of a laser sounding remote-measuring system according to the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a real-time monitoring device for window contamination of a laser sounding telemetry system, which includes a window glass 1, an emission module 3, a photoelectric detection module 4, a temperature monitoring module 2, a power supply module 5, a timing control module 6, and a digital signal processing module 7;
the window glass 1 is an optical light-transmitting window glass 1 of the laser sounding remote measuring system;
the transmitting module 3 and the photoelectric detection module 4 are adjacent and both are vertically arranged below the window glass 1, and in the embodiment, the transmitting module and the photoelectric detection module are arranged 10-40 mm below the window glass 1 so as to receive the strongest window pollution signal;
the temperature monitoring module 2 is arranged on one side of the transmitting module 3 or the photoelectric detection module 4;
the rest circuit devices, the power supply module 5, the time sequence control module 6 and the digital signal processing module 7 are arranged according to the situation, wherein the power supply module 5 supplies power to each module; the timing control module 6 controls circuit timing.
The transmitting module 3, the photoelectric detection module 4, the temperature monitoring module 2 and the power supply module 5 are all connected with the digital signal processing module 7 and the time sequence control module 6.
In this embodiment, the emitting module 3 employs a light emitting diode, and the light emitting diode emits ultraviolet light waves with narrow spectral width according to time sequence control. The light emitting diode can be a light emitting diode with emergent light in an ultraviolet band and a large emergent light divergence angle, so that a visible light band with strong sky background noise, such as a super-radiation light emitting diode with a central wavelength of 365nm and a light emitting angle of 110 degrees, can be avoided.
In this embodiment, the photoelectric detection module 4 employs a photoelectric detector, and a response spectrum band of the photoelectric detector is matched with an emission spectrum band of the light emitting diode, and can respond to an echo signal reflected by the window glass 1; the photoelectric detector is provided with a band-pass filter, so that the light-emitting diode has high transmittance in the range of an emission spectrum of the light-emitting diode and has high rejection rate in other conventional spectrums. The photoelectric detector can select a photodiode with high response sensitivity and low dark current noise within an effective response wave band of 200-400 nm.
In this embodiment, the photodetector is further provided with an amplifier and an analog-to-digital converter, which are used for sampling and amplifying the weak analog electrical signal after the photoelectric conversion, and then performing analog-to-digital conversion.
In this embodiment, the digital signal processing module 7 adopts a digital signal processor, and is configured to process the obtained data to obtain real-time window pollution data.
In this embodiment, the temperature monitoring module 2 employs a temperature sensor for acquiring an ambient temperature and transmitting the ambient temperature to the digital signal processing module 7. The temperature sensor can be a patch type temperature sensor.
The other circuit devices select proper sensors according to the circuit design condition.
As shown in fig. 2, the present embodiment further provides a method for monitoring window contamination of a laser sounding telemetry system in real time, including:
the light emitting diode is controlled to emit a light beam;
window glass and contaminants reflect or scatter light beams;
the photoelectric detector receives the light beam and performs photoelectric conversion;
amplifying the electric signal and performing analog-to-digital conversion, and simultaneously acquiring the ambient temperature by a temperature sensor;
and judging the window pollution condition.
In this embodiment, in order to eliminate interference of daytime sky background noise, the photoelectric detector is used to operate in time sequence, on one hand, the photoelectric detector is synchronously turned on with the light emitting diode to collect all information superimposed with reflected light, scattered light and sky background noise light, and on the other hand, the photoelectric detector operates when the light emitting diode is completely turned off, and only collects sky background noise information and is used for filtering sky background noise when window pollution is judged.
In this embodiment, in order to eliminate the change of the luminous efficiency and the spectral range of the light emitting diode and the change of the detection efficiency of the photodetector caused by the change of the ambient temperature, a temperature sensor is used to obtain an ambient temperature signal for correcting the temperature drift of the signal.
In this embodiment, the determination of the window contamination includes:
under certain temperature and without sky background noise interference, the light emitting diode module is controlled to emit light beams to irradiate the window glass, when no window pollution exists, the light beams are reflected by the upper surface and the lower surface of the window glass, and part of reflected light is received by the photoelectric detector and converted into a group of analog electric signals with constant numerical values;
when window pollution exists, the attachment on the upper surface of the window glass generates a scattering effect on the emitted light beam, the scattered light of part of the attachment and the reflected light of the window glass are received by the photoelectric detector to generate a group of analog electric signals higher than that in the case of no window pollution, after temperature drift correction and sky background noise correction are carried out on the electric signals, the difference value between the electric signals and the electric signals in the case of no pollution represents the window pollution degree, and the larger the difference value is, the heavier the window pollution degree is.
Specifically, an environment temperature signal and a signal collected by a photoelectric detector are transmitted to a digital signal processor after being subjected to analog-to-digital conversion, temperature drift correction of the signal is firstly carried out according to the environment temperature signal, then sky background noise correction is carried out, difference value operation is finally carried out to obtain a window pollution difference value, and correlation calibration of the difference value and window glass transmittance can be carried out under laboratory conditions so as to obtain the window glass transmittance directly from the difference value.
The device and the method can acquire real-time window pollution information, provide a trigger signal for a window self-cleaning device, correct temperature drift and sky background noise when window pollution conditions are judged, and are accurate in monitoring value, simple in structure, convenient to operate and high in practical value.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a laser sounding remote measurement system window pollutes real-time supervision device which characterized in that: the device comprises window glass, an emission module, a photoelectric detection module, a temperature monitoring module, a power supply module, a time sequence control module and a digital signal processing module;
the window glass is optical light-transmitting window glass of the laser sounding remote measuring system;
the emission module is adjacent to the photoelectric detection module, and both the emission module and the photoelectric detection module are vertically arranged below the window glass;
the temperature monitoring module is arranged on one side of the transmitting module or the photoelectric detection module;
the transmitting module, the photoelectric detection module, the temperature monitoring module and the power supply module are all connected with the digital signal processing module and the time sequence control module.
2. The device for monitoring window contamination of laser sounding telemetry system according to claim 1, wherein: the emitting module adopts a light emitting diode, and the light emitting diode emits ultraviolet light waves with narrow spectral width according to time sequence control.
3. The device for monitoring window contamination of laser sounding telemetry system according to claim 2, wherein: the photoelectric detection module adopts a photoelectric detector, and the response spectrum section of the photoelectric detector is matched with the emission spectrum section of the light-emitting diode and can respond to an echo signal reflected by the window glass; the photoelectric detector is provided with a band-pass filter, so that the light-emitting diode has high transmittance in the range of an emission spectrum of the light-emitting diode and has high rejection rate in other conventional spectrums.
4. The device for monitoring window contamination of laser sounding telemetry system according to claim 3, wherein: the photoelectric detector is also provided with an amplifier and an analog-to-digital converter, and the amplifier and the analog-to-digital converter are used for sampling and amplifying the weak analog electric signal after photoelectric conversion and then performing analog-to-digital conversion.
5. The device for monitoring window contamination of laser sounding telemetry system according to claim 1, wherein: the digital signal processing module adopts a digital signal processor and is used for processing the obtained data to obtain real-time window pollution data.
6. The device for monitoring window contamination of laser sounding telemetry system according to claim 1, wherein: the temperature monitoring module adopts a temperature sensor and is used for collecting the ambient temperature and transmitting the ambient temperature to the digital signal processing module.
7. The method for monitoring the window pollution of the laser sounding telemetry system in real time according to claim 1, wherein the method comprises the following steps: the method comprises the following steps:
the light emitting diode is controlled to emit a light beam;
window glass and contaminants reflect or scatter light beams;
the photoelectric detector receives the light beam and performs photoelectric conversion;
amplifying the electric signal and performing analog-to-digital conversion, and simultaneously acquiring the ambient temperature by a temperature sensor;
and judging the window pollution condition.
8. The method for monitoring window contamination of the laser sounding telemetry system in real time as claimed in claim 7, wherein: in order to eliminate interference of sky background noise in daytime, a photoelectric detector works according to time sequence, on one hand, the photoelectric detector is synchronously started with a light emitting diode to collect all information superposed with reflected light, scattered light and sky background noise light, and on the other hand, the photoelectric detector works when the light emitting diode is completely turned off to only collect sky background noise information and is used for filtering sky background noise when window pollution is judged.
9. The method for monitoring window contamination of the laser sounding telemetry system in real time as claimed in claim 8, wherein: in order to eliminate the change of the luminous efficiency and the spectral range of the light-emitting diode and the change of the detection efficiency of the photoelectric detector caused by the change of the environmental temperature, a temperature sensor is adopted to obtain an environmental temperature signal for correcting the temperature drift of the signal.
10. The method for monitoring window contamination of the laser sounding telemetry system in real time as claimed in claim 9, wherein: the judgment of the window pollution condition comprises the following steps:
when the window pollution does not exist, light beams emitted by the light emitting diode are reflected by the upper surface and the lower surface of the window glass, and part of reflected light is received by the photoelectric detector and converted into a group of analog electric signals with constant numerical values;
when window pollution exists, the attachment on the upper surface of the window glass generates a scattering effect on the emitted light beam, the scattered light of part of the attachment and the reflected light of the window glass are received by the photoelectric detector to generate a group of analog electric signals higher than that in the case of no window pollution, after temperature drift correction and sky background noise correction are carried out on the electric signals, the difference value between the electric signals and the electric signals in the case of no pollution represents the window pollution degree, and the larger the difference value is, the heavier the window pollution degree is.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110139584.0A CN112904318A (en) | 2021-02-01 | 2021-02-01 | Window pollution real-time monitoring device and method for laser sounding remote measurement system |
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| CN202110139584.0A CN112904318A (en) | 2021-02-01 | 2021-02-01 | Window pollution real-time monitoring device and method for laser sounding remote measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024014296A1 (en) * | 2022-07-13 | 2024-01-18 | 株式会社デンソーウェーブ | Optical window inspection device and laser radar device |
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