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High precision forward multiangle atmosphere scattering measuring method

An atmospheric scattering and measurement method technology, applied in the optical field, can solve the problems of complex mechanical structure design, inconvenient installation, and the inability of photoelectric sensors to achieve electrical characteristics.

Inactive Publication Date: 2009-01-14
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the performance of the two detectors to be exactly the same, but in fact neither the photoelectric sensor itself nor the detection circuit can achieve completely equal electrical characteristics.
In addition, the four transmitters / receivers all require high-precision positioning and alignment, which complicates the design of the mechanical structure and also brings inconvenience to the installation

Method used

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  • High precision forward multiangle atmosphere scattering measuring method
  • High precision forward multiangle atmosphere scattering measuring method
  • High precision forward multiangle atmosphere scattering measuring method

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Experimental program
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Effect test

Embodiment Construction

[0018] Referring to the accompanying drawings, the symbols are defined as follows:

[0019] 1. Infrared light source emission system

[0020] 2. Angular scattered light receiving system

[0021] 3. Shaft

[0022] 4. Particle clusters in sampling space

[0023] 5. GaAlAs infrared light emitting diode

[0024] 6. Beam collimating lens

[0025] 7. Photodetector

[0026] 8. Light intensity monitoring feedback signal

[0027] 9. Pulse modulation controller

[0028] 10. Thermistor

[0029] 11. Auxiliary photodetectors for mirror pollution monitoring

[0030] 12. Square wave oscillation signal

[0031] 13. Converging lens

[0032] 14. Si photodiode detector

[0033] 15. Optical filter

[0034] 16. Synchronous frequency selective amplifier and switch phase sensitive detection circuit

[0035] 17. Voltage / frequency converter

[0036] 18. Calculation unit

[0037] 19. Backscatter light source for mirror pollution monitoring

[0038] 20. Measured frequency signal

[0039...

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Abstract

A high accurate measuring method of forward multiangle atmospheric scattering includes setting optical emitting system / receiving system pair, crossing emitting light axis and receiving light axis on the same position by rotating two system relatively, arriving pulse light emitted by infrared LED to particle group at the same position and scattering pulse light by particle group, receiving said scattering by LED detector in receiving system, switching LED signal into switch phase sensitive rectifying circuit to use square wave oscillation signal to control pulse signal of infrared LED and switch - on of said rectifying circuit to be synchronized.

Description

technical field [0001] The invention belongs to the field of optics, in particular to a method for measuring atmospheric scattering from multiple angles. Background technique [0002] When light propagates in the atmosphere, it is attenuated by the scattering of air molecules, suspended particles such as clouds, fog, raindrops, and smoke in the atmosphere. Due to the effect of scattering, a series of practical activities such as ground transportation, sea and air navigation, satellite reconnaissance and remote sensing, and astronomical observation will encounter such problems: whether the target object at a certain distance is clear through the atmosphere with human eyes or instruments, and whether it can What is the limit distance to distinguish the target object from the background, that is, the visibility problem. The measurement of atmospheric scattering is actually the scattering extinction coefficient σ s Measurement. [0003] The existing measurement methods of atm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/49
Inventor 王缅刘文清陆亦怀李伟王锋平连翠华陈寅张玉钧陈军方武王亚萍刘建国魏庆农谢品华张长秀
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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