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Atmospheric visibility measuring system

A technology of atmospheric visibility and measurement system, which is applied in the direction of measuring devices, transmittance measurement, scattering characteristic measurement, etc., can solve the problems that measurement errors cannot be fully compensated, the reliability of measurement data decreases, and the lack of representativeness of visibility values, etc., Achieve the effects of avoiding the influence of background light, avoiding optical path adjustment, and high reliability

Active Publication Date: 2013-01-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] However, the scattering method also has the following disadvantages: 1) When encountering rainy and snowy weather, due to the interference of precipitation particles, the reliability of the measurement data will decrease
Even so, measurement errors cannot be fully compensated
2) In the case of low visibility, there is often an uneven atmospheric environment. Due to the small volume of the measured air medium, the measurement lacks the representativeness of the visibility value of the entire area

Method used

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Embodiment Construction

[0034] Such as figure 1 As shown, the atmospheric visibility detection system of the present invention is composed of the following parts: a light source transmitter, a scattered signal receiver, a transmission signal receiver, a corner reflector, a signal conditioning unit, and a DSP digital signal processing unit.

[0035] The transmission signal receiving end is located next to the light source transmitting end, and receives the optical signal reflected by the corner reflector after being emitted by the light source reflecting end. For the forward scattered light signal in the direction of 45°, the corner reflector is located in front of the light source, and the light beam is emitted from the reflected light source end and irradiated to the transmitted signal receiving end.

[0036] At the light emitting end, such as figure 2 As shown, a 785nm laser is used as the light source 3 as the light source, which is collimated by the lens 2 to form a collimated beam 1 . In the li...

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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 [0001] The invention relates to an atmospheric visibility measurement system, which belongs to the technical fields of meteorological element monitoring technology and traffic safety monitoring technology. Background technique [0002] Atmospheric visibility is a routine item in meteorological observation. It is a physical quantity that characterizes the transparency of the atmosphere, represents the optical physical state of the atmosphere, and is closely related to weather changes. In recent years, continuous meteorological observations have shown that due to the aggravation of air pollution, local smog in cities often leads to low visibility, which poses a great threat to public transportation and the health of residents. Visibility has also become a measure of pollutants in the atmosphere. an important indicator. Therefore, the real-time measurement and release of visibility has important practical significance for meteorology, atmospheric environment, a...

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Application Information

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IPC IPC(8): G01N21/59G01N21/47G01N21/01
Inventor 程寅刘文清刘建国陆亦怀桂华侨王亚平陈军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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