Atmospheric turbulance detection laser rader using position-sensitive detector

An atmospheric turbulence and laser detection technology, applied in the field of atmospheric turbulence parameter detection, can solve the problems of poor detection sensitivity and position measurement accuracy, limited space range, and inability to continuously measure, and achieve high sensitivity, low price, and flexible detection direction. Effect

Inactive Publication Date: 2007-04-11
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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Problems solved by technology

The disadvantage is that only a limited number of profiles can be given, and the spatial range of detection is limited, the experimental cost is high, and long-term continuous measurement cannot be performed
Its advantage is that it is cheap, but its detection sensitivity and position measurement accuracy are slightly worse than position-sensitive photomultiplier tubes

Method used

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  • Atmospheric turbulance detection laser rader using position-sensitive detector
  • Atmospheric turbulance detection laser rader using position-sensitive detector
  • Atmospheric turbulance detection laser rader using position-sensitive detector

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Embodiment Construction

[0034]The present invention will be further described below in conjunction with accompanying drawing:

[0035] It can be seen from Fig. 1 that the atmospheric turbulence detection lidar using position-sensitive detectors includes a pulse laser emitting unit 1, an echo light receiving unit 2, a photoelectric conversion unit 3, and a data acquisition and processing unit 4.

[0036] The pulse laser emitting unit 1 and the echo light receiving unit 2 are all prior art; the pulse laser emitting unit is composed of a pulse laser 11 with an external trigger input terminal and a beam expander 12; Orifice plate 21, receiving telescope objective lens 22, pinhole diaphragm 23, collimating lens 24, interference filter 25 and focusing lens 26 are formed; Place them close together so that the transmitted and received beams are approximately parallel.

[0037] The photoelectric conversion unit 3 consists of a reflective prism 31 and two position sensitive detectors 32 , 33 . The reflective...

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Abstract

The invention discloses a laser radar for detecting the atmosphere turbulence via a positioning sensitive detector, which relates to the refractive index structure constant profile Cn2 and atmospheric coherence length r0 of the atmosphere turbulence. In the invention, the laser radar takes a pulsed laser as the emission source, and the dual-aperture Rayleigh scattering echo received by the telescopes is focused on the positioning sensitive detector through the reflection prism, and the profile Cn2 and atmospheric coherence length r0 are obtained by micro-processing after the positioning signals are transferred to the digital signals via A/D processor.

Description

Technical field: [0001] The invention relates to the detection of atmospheric turbulence parameters, in particular to the detection of atmospheric turbulent refractive index structure constant profile by laser radar. It is suitable for atmospheric science research, as well as environmental protection, meteorology, aviation, laser atmospheric transmission, military and other fields. Background technique: [0002] Due to the influence of atmospheric turbulence, light intensity fluctuations and phase fluctuations will occur when light propagates in the atmosphere. For imaging systems, this can lead to blurred images; for laser-atmospheric delivery systems, this can seriously affect the quality of beam propagation. The parameters describing the effect of atmospheric turbulence are usually: Atmospheric coherence length r 0 and atmospheric refractive index structure constant C n 2 , where r 0 characterizes the integrated total effect of turbulence effects on the measured opti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01S17/89G01W1/00G01W1/08
CPCY02A90/10
Inventor 戴阳龚顺生李发泉程学武
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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