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2 mu m all-fiber coherent laser Doppler wind finding radar system

A Doppler wind measurement and radar system technology, applied in the field of 2μm all-fiber coherent laser Doppler wind measurement radar system, can solve the problems of good stability, inability to meet the requirements of miniaturization, strong operability, etc., and achieve Measuring the effect of long distance, high practical value and strong operability

Inactive Publication Date: 2010-09-08
HARBIN INST OF TECH
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Problems solved by technology

[0006] However, the development of 2μm optical fiber devices is relatively backward and has not kept pace with the development of 2μm laser technology
Therefore, the structure of the current 2μm coherent laser Doppler wind radar system has its own problems, that is, it has not completely solved the problem of all-fiber miniaturization of the receiving optical system, and cannot meet the requirements of the current vehicle-mounted, airborne and spaceborne 2μm coherent laser radar systems. Requirements for Miniaturization of Puler Wind Radar System
[0007] In short, the existing technical solutions for the structural optimization of 2μm coherent laser Doppler wind radar systems have more or less deficiencies, and cannot simultaneously achieve low cost, human eye safety, good stability, good real-time performance, and operability. Strong, long effective measurement distance, high measurement (speed and distance measurement) accuracy and all-fiber miniaturization requirements

Method used

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  • 2 mu m all-fiber coherent laser Doppler wind finding radar system

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Embodiment Construction

[0032] figure 1It is a schematic diagram of the structure of the 2μm off-axis Cassegrain optical antenna system. It includes beam deflector 45° planar mirrors 101 and 102 , optical antenna primary mirror 103 , secondary mirror 104 and atmosphere 105 . The optical antenna adopts an off-axis Cassegrain double-emission structure with transceivers combined. In the double-reflection system, a quadric surface is used to eliminate various primary aberrations. The parameter design of the emission system mainly considers the beam truncation of the laser and the The speckle effect after the laser irradiates the target. The emission beam diameter of the transmitting optical antenna system is 10mm, the magnification of the transmitting optical antenna system is 15 times, the diameter of the primary mirror is 160mm, and the effective aperture is 150mm; the aperture of the secondary mirror is 12.7mm, and the effective aperture is 10mm. The aspheric surfaces selected for both the primary m...

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Abstract

The invention discloses a 2 mu m all-fiber coherent laser Doppler wind finding radar system, which consists of a 2 mu m off-axis Cassegrain optical antenna system, a 2 mu m laser beam splitting system, a 2 mu m seed implantation laser amplifier, a 2 mu m monitoring detector system, and a 2 mu m balanced heterodyne detection system. The system overcomes the defect of ambient interference existing in a free space optical path, overcomes the influence of shot noise on heterodyne reception signal-to-noise ratio, and solves the problems of all fiber and miniaturization of the 2 mu m all-fiber coherent laser Doppler wind finding radar system, so that the 2 mu m all-fiber coherent laser Doppler wind finding radar system has a more compact structure. In addition, the system has the characteristics of safe laser for human eye, optical path connection by adopting flexible optical fiber devices, high operability and stability, low cost, good real time, long effectively measured distance, high measurement accuracy (speed measurement and distance measurement) and the like, and has high practical value in the field of coherent laser Doppler wind finding radar.

Description

technical field [0001] The invention relates to a coherent laser Doppler wind radar system, in particular to an eye-safe 2 μm all-fiber coherent laser Doppler wind radar system using a 2 μm transceiver combined with an off-axis Cassegrain optical antenna. Background technique [0002] The traditional radar system structure adopts a free-space optical path structure. The disadvantage is that the structure is large in size. Due to the use of a large number of optical components, its cost is high, adjustment is difficult, stability is poor, operability is not strong, and repeated calibration adjustments are required. [0003] With the rapid development of laser technology and optical communication technology, especially the rapid development of optical fiber technology, it has brought opportunities for the optimization of laser radar system structure. Therefore, many researchers at home and abroad have turned their attention to optical fiber technology, hoping to solve various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01S7/481G02F1/35
CPCY02A90/10
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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