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Laser Transmissometer Visibility Measurement System and Method Considering Multiple Scattering

A technology of multiple scattering and atmospheric transmission, applied in the field of visibility detection, can solve the problem of multiple scattering of light sources, and achieve the effect of reducing the field of view.

Inactive Publication Date: 2017-11-14
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, transmissometer products at home and abroad only suppress stray light, and have not studied the multiple scattering phenomenon produced by the light source itself.

Method used

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  • Laser Transmissometer Visibility Measurement System and Method Considering Multiple Scattering
  • Laser Transmissometer Visibility Measurement System and Method Considering Multiple Scattering
  • Laser Transmissometer Visibility Measurement System and Method Considering Multiple Scattering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a kind of laser atmospheric transmissometer visibility measurement method that considers multiple scattering, comprises the following steps:

[0029] ⑴. System initialization: the measurement system starts with the initial baseline length L 0 =30m and initial receiver field of view angle θ 0 =30mrad to measure the visibility and get the initial visibility measurement value V 0 =76.9m; At this time, the atmospheric visibility is low.

[0030] ⑵. Select the baseline length: according to the initial visibility measurement value V 0 =76.9m<500m, select the first receiver with a baseline length of 30m for measurement, and at the same time determine the working mode to consider multiple scattering.

[0031] (3). Receiver field of view adjustment: initial visibility measurement value V 0 =76.9m<1500m, the influence of multiple scattering needs to be considered, and the measurement needs to adjust the size of the receiver’s field of view diaphragm to adjust th...

Embodiment 2

[0036] Embodiment 2, a kind of laser atmospheric transmissometer visibility measurement method that considers multiple scattering, comprises the following steps:

[0037] ⑴. System initialization: the measurement system starts with the initial baseline length L 0 =30m and initial receiver field of view angle θ 0 =1mrad to carry out visibility measurement and get the initial visibility measurement value V 0 =762.7m; At this time, the visibility of the atmosphere is slightly higher;

[0038] ⑵.Select the baseline length: according to the initial visibility measurement value 500m0 =762.7m<1500m, select the second receiver with a baseline length of 75m for measurement, and at the same time determine that the working mode is the working mode considering multiple scattering;

[0039] (3). Receiver field of view adjustment: initial visibility measurement value V 0 =762.7m<1500m, the influence of multiple scattering needs to be considered, and the size of the field diaphragm of the...

Embodiment 3

[0043] Embodiment 3, a kind of laser atmospheric transmissometer visibility measurement method that considers multiple scattering, comprises the following steps:

[0044] ⑴. System initialization: the measurement system starts with the initial baseline length L 0 =30m and initial receiver field of view angle θ 0 =30mrad to measure the visibility and get the initial visibility measurement value V 0 =1517m;

[0045] ⑵. Select the baseline length: according to the initial visibility measurement value V 0 = 1517m > 1500m, choose the second receiver with a baseline length of 75m for measurement, no need to consider multiple scattering, no need to adjust the field of view angle of the receiver;

[0046] (3). During the adjustment and subsequent measurement process, if the obtained visibility value has V 0 0 For range changes in >1500, the baseline length and working mode need to be reselected.

[0047] The specific measurement data for this process are as follows:

[0048] ...

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Abstract

The invention relates to a laser atmospheric transmissometer visibility measurement system considering multiple scattering, which includes a transmitter unit and a receiver unit, the transmitter unit is mainly composed of a laser and a transmitting lens; the receiver unit consists of more than two The receiver is formed, the positions of the two or more receivers correspond to the baselines of their respective lengths, and there is an included angle between the baselines of the respective lengths of the two or more receivers; the receiver is mainly composed of a receiving lens, an adjustable field of view It consists of a diaphragm, a lens, a band-pass filter, a condenser and an optical sensor; the transmitter can be rotated within the included angle range of the baselines of the respective lengths of the receiver. The invention also provides a laser atmospheric transmissometer visibility measurement method considering multiple scattering. The invention can realize the intelligent adjustment of the base line length of the transmissometer and the field angle of the receiver according to the current visibility, can effectively suppress the influence of multiple scattering in low visibility, and reduce the measurement error caused by multiple scattering in low visibility.

Description

technical field [0001] The invention relates to the technical field of visibility detection, in particular to a laser atmospheric transmissometer visibility measurement system and measurement method considering multiple scattering. Background technique [0002] Atmospheric visibility is a physical quantity that describes the degree of transparency (or turbidity) of the atmosphere by distance from the perspective of whether the target can be seen and identified. The definition given by the International Civil Aviation Organization (ICAO) is: when observing against a bright background, the maximum distance at which a black target of appropriate size near the ground can be seen and recognized; The maximum distance at which a light with a light intensity of about 1K color temperature can be seen and recognized. Since the establishment of Koschmieder's law in foreign countries, they have begun to devote themselves to the research of visibility measurement technology. The transm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/61
Inventor 熊兴隆刘春媛蒋立辉李猛台宏达
Owner CIVIL AVIATION UNIV OF CHINA
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