CN102879359A - Atmospheric visibility measuring system - Google Patents
Atmospheric visibility measuring system Download PDFInfo
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Abstract
An atmospheric visibility measuring system is characterized in that the system can realize full-scale precise measurement of atmospheric visibility. The system adopts a measurement structure with a single light source and double baselines; a light source transmitting terminal and two signal receiving terminals are integrated into a whole body, which reduces the complexity of optical path debugging and measurement electronic system design, reduces requirements for field installation, improves system practicality, and reduces equipment cost. Meanwhile, the laser light source is subject to high frequency modulation, and an optical filter is installed in the front of a detector, which improve the system capability of resisting background light and stray light influence. In the signal sampling part, synchronous demodulation weak signal detection technology is adopted, which improves the measurement precision and measurement range of the system. The atmospheric visibility measuring system of the invention is applicable to industries of meteorological stations, airports, highway, harbours, atmosphere environment monitoring, and the like.
Description
Technical field
The present invention relates to a kind of system for measuring atmospheric visibility, belong to meteorological element monitoring technology, traffic safety monitoring technical field.
Background technology
Atmospheric visibility is the conventional project in the meteorological observation, and it is a physical quantity that characterizes the atmosphere transparency, is representing the atmospheric optics physical state, is closely related with the variation of weather.In recent years, continuous meteorological observation shows, because the air ambient pollution level increases the weight of, the haze of part, city usually causes lower visibility, health to public transport, resident consists of greatly threat, and visibility also becomes an important indicator weighing pollutant in the atmosphere.Therefore, the real-time measurement of visibility, issue have meteorology, atmospheric environment, traffic safety and have important practical significance.In China, the atmospheric visibility of present most weather stations is observed still take the artificial visually examine as main, is difficult to realize standardization and the real-time of visibility observation.
In recent years, along with the development of visibility measurement technology, the measuring method of multiple principle occurs, comprised a series of measuring methods such as phase scattering method behind the laser radar, transmission-type mensuration, Forward scattering.Although the concrete structure of each quasi-instrument, measuring method difference, the ultimate principle of measuring is consistent, measures atmospheric extinction coefficient or atmospheric transmittance, can calculate formula by visibility and calculate the visibility value.At present, common visibility measurement instrument mainly contains two kinds: transmission-type and forward scattering type.
The transmission-type visibility instrument is a kind of surveying instrument that obtains the visibility value by direct measurement atmospheric extinction coefficient, its principle at one end adopts the active light source emission, in the variation of another receiving end measured light intensity, according to the distance L between the two ends (base length), calculate the visibility value.
Transmission beam method is a kind of point-device measuring method, but on the high-visibility measuring accuracy, is subject to the restriction of base length.Calculate by measure theory, under the baseline of 80 meters length, if visibility is in 10 kilometers the situation, require the error of visibility measurement value in 10%, the measuring accuracy of transmitance must reach in 3 ‰, this is for too high in the measuring system accuracy requirement of outfield operation for a long time, the high cost of realization.Simultaneously, measuring baseline can not be long, and this is that transmitance is excessively low because under than the low visibility condition, and detector can only receive the extremely signal of faint light source, even may not receive light signal, also can have influence on measurement effect.Thus, transmission beam method is a kind of point-device measuring method, but is subject to the restriction of baseline, is only suitable for measuring in interior range at 8000 meters.
Diffuse transmission type visibility is to utilize the Mie scattering principle, measures a small size air to the forward scattering intensity of light, extrapolates total scattering coefficient, obtains total extinction coefficient, thereby is finally inversed by the visibility value.Generally select 30-45 ° angle to take measurement of an angle as forward scattering, because the Scattering Phase Function on this angular range does not have susceptibility to different-grain diameter is aerocolloidal.
Scattering method visibility measurement method measurement range wide (upper limit can reach more than the 50km), do not need to install long baseline, can under various geographical conditions, use, and compact conformation, installation simple, be easy to safeguard.
But scattering method also has following shortcoming: 1) when running into sleety weather, because the interference of precipitation particles, its measurement data confidence level will descend.Meteorology error when remedying sleety weather has increased type and the intensity of other sensor in order to survey precipitation in a lot of scattering method measuring instruments.Nonetheless, measuring error still can not be by full remuneration.2) in the blind situation, inhomogeneous atmospheric environment usually occurs, because tested air dielectric volume is very little, measure the representativeness that lacks whole distract visibility value.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, a kind of atmospheric visibility detection system of gamut is provided, the advantage of integrated existing measuring method, measuring system by single light source, double-basis line, realization transmission, scattered signal are measured simultaneously, adopt different measuring methods at different ranges, obtain the most accurately measurement data.
The technology of the present invention solution: a kind of system for measuring atmospheric visibility comprises: light source transmitting terminal, transmission signal receiving end, scattered signal receiving end, corner reflector, signal condition unit, DSP digital signal processing unit; The transmission signal receiving end is placed on by the light source transmitting terminal, and is parallel with the light source transmitting terminal, receives the light signal that the opposite corner reflector reflects; The scattered light signal receiving terminal is placed on light source and launches distolateral the place ahead, and direction and light beam of light source level are 45 °, receives the scattered light signal on 45 ° of directions of source emissioning light; The front 40 meters established angle transmitting mirrors of light source transmitting terminal, the light beam that the reflection source transmitting terminal sends; Under the control of DSP digital signal processing unit, select module by control channel, selective light signal measurement passage, measuring-signal entering signal conditioning unit carries out signal condition, and the measuring-signal after the conditioning inputs to the DSP digital signal processing unit; DSP digital signal processing unit State selective measurements mode is carried out analog to digital conversion to measuring-signal, measures the visibility value;
Described light source transmitting terminal adopts diode laser as light source, and its optical source wavelength is on the 785nm wave band;
Described light source transmitting terminal also comprises the modulation of source circuit, and the square-wave signal that is produced 2.4k by DSP digital signal processing unit control modulation of source circuit is modulated light source as modulation signal, overcomes the impact of extraneous parasitic light in the measuring process; Adopt simultaneously the APC control circuit, the stabilized light source output power;
At the light source transmitting terminal, described light source shines on the corner reflector on opposite by forming a light beam behind the convex lens collimations, forms a branch of and the original folded light beam of parallel, the opposite direction of light beam;
Shown angle transmitting mirror is comprised of three vertical total reflective mirrors of placing, three minute surfaces mutual 90 ° vertical, make that reflected light is parallel with incident light, opposite direction;
Shown angle transmitting mirror is 40 meters with light source transmitting terminal distance in the present invention;
After the light beam of light source transmitting terminal emission is reflected by corner reflector, through poly-to detector surface again after the convex lens remittance of transmission receiving end, carry out photoelectric conversion first;
The scattered light signal receiving terminal is placed on light source and launches distolateral the place ahead, direction and light beam of light source level are 45 °, the forward scattering light of measurement light source utilizing emitted light on 45 ° of directions, scattered light through poly-to detector surface again after the convex lens remittance of scattering receiving end, carry out photoelectric conversion first;
Before the detector of above-mentioned scattered signal receiving end, transmission signal receiving end, optical filter is installed, is filtered the not parasitic light on the light source wave band;
Described detector adopts silicon PIN photodetector;
Described signal condition unit comprises prime amplifier, channel to channel adapter, phase-sensitive detector (PSD), bandpass filter, two-stage amplifier; Detector is converted to electric signal with the light signal that detects, after the prime amplifier amplification, under the control of DSP digital processing element, by the control channel selector switch, select corresponding light measurement signal to enter phase-sensitive detector (PSD) and carry out phase sensitive detection, finish the demodulation of measuring-signal, carry out AD in the input DSP digital signal processing unit after the signal after the demodulation amplifies by band-pass filter, two-stage amplifier and transform, calculate the visibility value.
By DSP digital signal processing unit State selective measurements mode, measure the visibility value, concrete measuring method is as follows:
(1) first gating transmission measurement signalling channel, after the conditioning of optical signal transmissive process, the AD conversionization, obtaining transmitted intensity is I, calculates the visibility value, computing formula:
Wherein, MOR is the visibility value, I
0Being initial light intensity, is the light intensity before light source does not pass through atmospheric attenuation.I
0Calculating be before equipment is installed, the angle transmitting mirror on light source opposite is moved to light source, avoid the light intensity value that the atmospheric extinction impact is measured, and be recorded in the Installed System Memory;
(2) when the transmission visibility value that calculates less than 8000 meters, the value error of transmission visibility MOR is less, system exports current transmission visibility value; When the value that calculates MOR greater than 8000 meters, the error amount of transmission visibility is larger, with the calculating visibility value of scattered signal as current visibility value, gate is selected in the control of DSP digital processing element, the gating scattered light is measured passage, scattered light signal is carried out demodulation, carry out again AD and transform, and calculate MOR
s, computing formula:
Wherein, K is the system constants of instrument, by repeatedly calibrating the constant that obtains, I with the artificial observation value
sThe scattered light measuring-signal after transforming through AD, the output MOR of system
sAs current visibility value.
The present invention's advantage compared with prior art is:
(1) the present invention has overcome the deficiency on the existing visibility measurement method, realizes the accurate measurement on gamut.On the low visibility range, adopt the transmission measurement mode, be not subjected to the interference of precipitation weather, improved measuring accuracy; And under high-end visibility conditions, adopting the forward scattering metering system, the performance Forward scattering is measured the advantage of upper limit for height.And in the situation that than high-visibility, the situation that precipitation weather and atmospheric environment unevenness can not occur, also can avoid the impact on the scattering method measurement in above-mentioned two situations, be a kind of Visibility Measures System that can both accurately measure on the gamut section;
(2) the present invention adopts the double-basis line measuring method of corner reflector, has increased the base length of measuring, and has improved the transmission measurement precision, simultaneously, since the reflection characteristic of corner reflector, the light path adjustment of complexity when having avoided installing; Structurally in the design, light source transmitting terminal and two signal receiving ends can be designed to an integral body, are convenient to the realization of simplified structure and metering circuit;
(3) in system, in order to guarantee the consistance of two-way measuring-signal, adopted the mode of the single channel measuring-signal conditioning of signal switching, guarantee the consistance that two ways of optical signals is measured;
(4) in system, the mode of the single light source transmitting terminal of employing realizes two kinds of measuring methods, and system is more succinct, be easy to realize, reliability is higher;
(5) method for designing that adopts light source high frequency modulated, detector front end that optical filter is installed has effectively been avoided the impact of extraneous bias light.
Description of drawings
Fig. 1 is measuring system schematic diagram of the present invention;
Fig. 2 is light source transmitting terminal structural representation among the present invention;
Fig. 3 is signal receiving end structural representation of the present invention;
Fig. 4 is corner reflector structural representation among the present invention.
Embodiment
As shown in Figure 1, atmospheric visibility detection system of the present invention is comprised of following part: light source transmitting terminal, scattered signal receiving end, transmission signal receiving end, corner reflector, signal condition unit, DSP digital signal processing unit form.
The transmission signal receiving end is positioned at light source transmitting terminal next door, the light signal that reflects through corner reflector after the emission of reception light source reflection end, the scattered signal receiving end is positioned at light source transmitting terminal front side, be the 45° angle degree with light source, reception light source transmitting terminal sends the forward-scattering signal on 45 ° of directions of light, corner reflector is positioned at the place ahead of light source, and the reflected light source is sent light beam, shines the transmission signal receiving end.
At the light source transmitting terminal, as shown in Figure 2, light source adopts the laser instrument of 785nnm as light source 3, through forming collimated light beam 1 behind lens 2 collimations.In control circuit for light source, the square-wave signal of input 2.4k is modulated light source as modulation signal, overcomes the impact of extraneous parasitic light in the measuring process, and adopts APC control circuit, stabilized lasers output power.
Transmission signal receiving end, scattered signal receiving end adopt identical structure, as shown in Figure 3.Incident beam 4 converges to the surface of detector 7 by behind the convex lens 5, carries out photoelectric conversion by detector 7, and place optical filter 6 in detector front end, only make that the light beam on the light source wave band can pass through, filtering extraneous parasitic light, improve the signal to noise ratio (S/N ratio) of measuring system.
As shown in Figure 4, corner reflector 9 can be regarded as by three vertical total reflective mirrors of placing, three faces are orthogonal, when incident ray 8 is arranged, return by former direction behind the light Multi reflection, reflection ray 8 is parallel with incident ray 10, and direction becomes 180 °, such structure is more stable than planar mirror structure, and light path is easy to adjust more.
It is upper that angle transmitting mirror 9 is placed on the distance of 40 meters of light source front ends, and through the emission of catoptron, light doubles through the length of atmosphere, and light path is 2 times 40 meters, so the measurement base length of system is 80 meters.
Detector adopts silicon PIN photodetector, in the frequency range of light source higher sensitivity is arranged.
The signal condition unit is comprised of modules such as preposition amplification, channel selecting, phase sensitive detection, signal filtering, secondary amplifications.Detector is converted to electric signal with the light signal that detects, and after amplifying by prime amplifier, through after the channel selecting, adopts the demodulation of switching regulator phase-sensitive detector (PSD) settling signal.In actual measurement, when visibility higher, be that optical signal transmissive or scattered light signal all are very faint, when visibility reached more than 6 kilometers, the value of measuring-signal and noise was on a magnitude, therefore, in the present invention, utilize Synchronous Detection to improve signal to noise ratio (S/N ratio), adopt the switching regulator phase-sensitive detector (PSD) as the core component of the lock-up amplifier circuit of measuring light signal, the amplitude discrimination phase demodulation of settling signal guarantees to extract the feeble signal of measuring light.Signal after the demodulation makes its amplitude be suitable for the input of analog to digital converter after amplifying through band-pass filter, two-stage amplifier, sends in the digital processing system.
The DSP digital processing element adopts DSPTMS320F2812 as CPU (central processing unit), and the State selective measurements mode is carried out ultra high speed A/D conversion to measuring-signal, and measurement data is processed.After system began to measure, DSP control channel was selected module, to carrying out analog to digital conversion through the signal after the conditioning, the digital signal that transforms is stored in the memory field processes respectively.Step is as follows:
(1) first gating transmission channels is measured light signal to the transmission end and is carried out demodulation, analog-to-digital conversion, obtains the intensity I of optical signal transmissive, passes through formula
Calculate current visibility value MOR, when the visibility value that calculates during less than 8000 meters, the output measurement data enters next measuring period;
(2) when visibility value during greater than 8000 meters, because systematic error, the visibility measurement value error of this moment is larger.Switching channel is selected module, the transmission end is measured light signal carry out demodulation, analog-to-digital conversion, obtains scattered light signal I
s, pass through formula
Calculate current visibility value MOR
S, the output measurement data enters next measuring period.Measurement result is exported by the communication serial ports.The processing of above-mentioned data, data output are all finished in the DSP digital signal processing unit.
I in the above-mentioned formula
0Being initial light intensity, is the light intensity before light source does not pass through atmospheric attenuation.I
0Calculating be before equipment is installed, the angle transmitting mirror on light source opposite is moved to light source, avoid the light intensity value that the atmospheric extinction impact is measured, and be recorded in the Installed System Memory.In the formula, K is the system constants of instrument, by repeatedly calibrating the constant that obtains with the artificial observation value.
The content that is not described in detail in the instructions of the present invention belongs to the known prior art of this area professional and technical personnel.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a system for measuring atmospheric visibility is characterized in that comprising: light source transmitting terminal, transmission signal receiving end, scattered signal receiving end, corner reflector, signal condition unit and DSP digital signal processing unit; The angle transmitting mirror is comprised of three vertical total reflective mirrors of placing, three minute surfaces mutual 90 ° vertical, make that reflected light is parallel with incident light, opposite direction; The angle transmitting mirror is installed light source transmitting terminal opposite, the light beam that the reflection source transmitting terminal sends; Angle transmitting mirror and light source transmitting terminal distance are 40 meters, and through after the reflection of catoptron, the measurement base length of system is 80 meters; The transmission signal receiving end is placed on by the light source transmitting terminal, and is parallel with the light source transmitting terminal, receives the light signal that the opposite corner reflector reflects, and carries out transmitted light and measures; The scattered light signal receiving end is placed on light source and launches distolateral the place ahead, and direction and light beam of light source level are 45 °, receives the forward-scattering signal on 45 ° of directions of source emissioning light, carries out scattered light and measures; The signal condition unit is comprised of prime amplifier, channel to channel adapter, phase-sensitive detector (PSD), bandpass filter, two-stage amplifier; Detector is converted to electric signal with the light signal that detects, after the prime amplifier amplification, under the control of DSP digital processing element, by the control channel selector switch, select corresponding light measurement signal to enter phase-sensitive detector (PSD) and carry out phase sensitive detection, finish the demodulation of measuring-signal, carry out AD in the input DSP digital signal processing unit after the signal after the demodulation amplifies by band-pass filter, two-stage amplifier and transform, calculate the visibility value; DSP digital signal processing unit control State selective measurements passage is processed through the measuring-signal after the conditioning, and measuring-signal is carried out analog to digital conversion, and the State selective measurements mode, measures the visibility value, and concrete measuring process is as follows:
DSP digital signal processing unit elder generation gating transmission measurement signalling channel, after the conditioning of optical signal transmissive process, the AD conversionization, obtaining transmitted intensity is I, calculates the visibility value, computing formula:
Wherein, MOR is the visibility value, I
0Being initial light intensity, is the light intensity before light source does not pass through atmospheric attenuation; I
0Calculating be before equipment is installed, the angle transmitting mirror on light source opposite is moved to light source, avoid the light intensity value that the atmospheric extinction impact is measured, and be recorded in the Installed System Memory; When the transmission visibility value that calculates less than 8000 meters, the value error of transmission visibility MOR is less, system exports current transmission visibility value; When the value that calculates MOR greater than 8000 meters, the error amount of transmission visibility is larger, with the calculating visibility value of scattered signal as current visibility value, gate is selected in the control of DSP digital processing element, the gating scattered light is measured passage, scattered light signal is nursed one's health, carried out again AD and transform, and calculation method for scattering MOR
s, computing formula
Wherein, K is the system constants of instrument, by repeatedly calibrating the constant that obtains, I with the artificial observation value
sThe intensity of measuring scattered light signal, the output MOR of system
sAs current visibility value.
2. described system for measuring atmospheric visibility according to claim 1, it is characterized in that: described light source transmitting terminal adopts diode laser as light source, and its optical source wavelength is on the 785nm wave band.
3. described system for measuring atmospheric visibility according to claim 1, it is characterized in that: described light source transmitting terminal also comprises the modulation of source circuit, the square-wave signal that is produced 2.4k by DSP digital signal processing unit control modulation of source circuit is modulated light source as modulation signal, overcomes the impact of extraneous parasitic light in the measuring process; Adopt simultaneously the APC control circuit, the stabilized light source output power.
4. described system for measuring atmospheric visibility according to claim 1, it is characterized in that: at the light source transmitting terminal, light source shines on the corner reflector on opposite by forming a light beam behind the convex lens collimations, forms a branch of and the original folded light beam of parallel, the opposite direction of light beam.
5. described system for measuring atmospheric visibility according to claim 1 is characterized in that: poly-to detector surface again after converging through the convex lens of transmission receiving end first after the light beam of described light source transmitting terminal emission is reflected by corner reflector, carry out photoelectric conversion.
6. described system for measuring atmospheric visibility according to claim 1, it is characterized in that: the light beam of described light source transmitting terminal emission is through the atmospheric particles scattering, on 45 ° of forward scattering directions, through poly-to detector surface again after the convex lens remittance of scattering receiving end, carry out photoelectric conversion.
7. described system for measuring atmospheric visibility according to claim 1 is characterized in that: before the detector of above-mentioned scattered signal receiving end, transmission signal receiving end optical filter is installed, is filtered the not parasitic light on the light source wave band.
8. described system for measuring atmospheric visibility according to claim 1, it is characterized in that: described detector adopts silicon PIN photodetector.
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| CN103344614A (en) * | 2013-07-02 | 2013-10-09 | 中国科学院合肥物质科学研究院 | Device and method for measuring atmospheric transmissivity at high precision |
| CN103413442A (en) * | 2013-07-30 | 2013-11-27 | 刘伟 | Highway agglomerate fog early warning system based on intervisibility distance monitoring and early warning method thereof |
| CN103674905A (en) * | 2013-12-09 | 2014-03-26 | 西南技术物理研究所 | Double-end single baseline transmission-type visibility meter |
| CN103940745A (en) * | 2014-05-05 | 2014-07-23 | 北京雪迪龙科技股份有限公司 | Air quality detecting device and detection method |
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| CN104596902A (en) * | 2014-07-28 | 2015-05-06 | 白薇 | Ship gas control method |
| CN104749138A (en) * | 2015-03-24 | 2015-07-01 | 北京赛凡光电仪器有限公司 | Method for shielding background radiation influences in visibility meter |
| CN104865577A (en) * | 2015-05-25 | 2015-08-26 | 上海翌森信息科技有限公司 | Laser range finding system |
| CN106226783A (en) * | 2016-09-14 | 2016-12-14 | 苏州光讯环境科技有限公司 | Atmospheric particulates optical parameter measurement system based on laser radar |
| CN106370569A (en) * | 2015-07-22 | 2017-02-01 | 天津同阳科技发展有限公司 | Particulate matter online monitor signal pre-processing circuit based on Mie scattering |
| CN107356565A (en) * | 2017-08-31 | 2017-11-17 | 安徽省大气探测技术保障中心 | Portable visibility transilluminator |
| CN109520972A (en) * | 2018-12-04 | 2019-03-26 | 青岛理工大学 | A kind of stagewise visibility measurement method and device |
| CN109709076A (en) * | 2019-02-20 | 2019-05-03 | 中国气象局气象探测中心 | A kind of forward scattering visibility meter detection system and method |
| CN109827906A (en) * | 2019-01-31 | 2019-05-31 | 西安理工大学 | A kind of inversion method of laser radar slant visibility |
| CN112964644A (en) * | 2021-02-03 | 2021-06-15 | 南京信息工程大学 | High-precision visibility detection method based on full-duplex photon communication |
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| CN103344614A (en) * | 2013-07-02 | 2013-10-09 | 中国科学院合肥物质科学研究院 | Device and method for measuring atmospheric transmissivity at high precision |
| CN103413442A (en) * | 2013-07-30 | 2013-11-27 | 刘伟 | Highway agglomerate fog early warning system based on intervisibility distance monitoring and early warning method thereof |
| CN103674905A (en) * | 2013-12-09 | 2014-03-26 | 西南技术物理研究所 | Double-end single baseline transmission-type visibility meter |
| CN103940745A (en) * | 2014-05-05 | 2014-07-23 | 北京雪迪龙科技股份有限公司 | Air quality detecting device and detection method |
| CN104596902A (en) * | 2014-07-28 | 2015-05-06 | 白薇 | Ship gas control method |
| CN104374747B (en) * | 2014-10-30 | 2017-04-12 | 北京空间机电研究所 | Double-base-line transmissometer for atmospheric visibility |
| CN104374747A (en) * | 2014-10-30 | 2015-02-25 | 北京空间机电研究所 | Double-base-line transmissometer for atmospheric visibility |
| CN104749138A (en) * | 2015-03-24 | 2015-07-01 | 北京赛凡光电仪器有限公司 | Method for shielding background radiation influences in visibility meter |
| CN104865577A (en) * | 2015-05-25 | 2015-08-26 | 上海翌森信息科技有限公司 | Laser range finding system |
| CN106370569A (en) * | 2015-07-22 | 2017-02-01 | 天津同阳科技发展有限公司 | Particulate matter online monitor signal pre-processing circuit based on Mie scattering |
| CN106226783A (en) * | 2016-09-14 | 2016-12-14 | 苏州光讯环境科技有限公司 | Atmospheric particulates optical parameter measurement system based on laser radar |
| CN107356565A (en) * | 2017-08-31 | 2017-11-17 | 安徽省大气探测技术保障中心 | Portable visibility transilluminator |
| CN109520972A (en) * | 2018-12-04 | 2019-03-26 | 青岛理工大学 | A kind of stagewise visibility measurement method and device |
| CN109827906A (en) * | 2019-01-31 | 2019-05-31 | 西安理工大学 | A kind of inversion method of laser radar slant visibility |
| CN109709076A (en) * | 2019-02-20 | 2019-05-03 | 中国气象局气象探测中心 | A kind of forward scattering visibility meter detection system and method |
| CN112964644A (en) * | 2021-02-03 | 2021-06-15 | 南京信息工程大学 | High-precision visibility detection method based on full-duplex photon communication |
| CN113588604A (en) * | 2021-07-27 | 2021-11-02 | 中国气象局上海物资管理处 | Semiconductor laser transmission system |
| CN113640222A (en) * | 2021-07-27 | 2021-11-12 | 南京理工大学 | Handheld laser scattering type aerosol attenuation characteristic measuring instrument with double working modes |
| CN113640222B (en) * | 2021-07-27 | 2024-06-07 | 南京理工大学 | Hand-held double-working-mode laser scattering type aerosol attenuation characteristic measuring instrument |
| CN113959987A (en) * | 2021-09-27 | 2022-01-21 | 湖南国天电子科技有限公司 | Method and device for measuring visibility circular motion of airport |
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