Scanning three-dimensional imaging laser radar based on linear array APD detector and method

A technology of three-dimensional imaging and laser scanning, which is applied in the direction of radio wave measurement systems, instruments, and measurement devices, can solve the problems of low imaging efficiency of lidar, and achieve the effects of improved detection efficiency, compact system, and component saving

Inactive Publication Date: 2010-08-25
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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[0004] The present invention proposes a laser scanning three-dimensional imaging radar and an imaging method based on a linear array APD detector, aiming at solving the probl

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  • Scanning three-dimensional imaging laser radar based on linear array APD detector and method
  • Scanning three-dimensional imaging laser radar based on linear array APD detector and method
  • Scanning three-dimensional imaging laser radar based on linear array APD detector and method

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Embodiment Construction

[0014] The linear array APD detector 1 adopts the 25-element linear array APD detector C30985E of Perkin Elmer Company. The receiving telescope 5 adopts an off-axis double mirror structure, and the volume is compressed. The receiving telescope 5 has an effective aperture of 30mm and a focal length of 150mm. The receiving field of view of the linear array APD detector 1 coincides with the far-field spot of the bar laser, the receiving field of view of a single pixel is 2×2mrad, and the total receiving field of view is 2×48mrad. The center of the laser spot coincides with each other. Under the control of the signal processing circuit 2, the fiber laser 3 emits a circular Gaussian pulsed laser beam with a divergence angle of 1 mrad, a pulse width of 7 ns, and a repetition frequency of 60 kHz. The laser beam is shaped into a bar-shaped laser beam by the laser shaping unit 4 , and the divergence angle becomes 1mrad×80mrad, and is irradiated to the detection area through the two-d...

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Abstract

The invention discloses a scanning three-dimensional imaging laser radar based on a linear array APD detector and an imaging method. The laser radar shapes the circular Gaussian laser beams into stripe laser to be transmitted, the linear array APD detector receives the laser echo, and the receiving field of view of the linear array APD detector coincides with the far-field facula of the laser. The range data are finally obtained after the signals output by the detector are amplified and processed. The laser radar completes measurement of the whole field of view via a two-dimensional scanning mechanism. The invention greatly improves the detection efficiency without increasing the repetition frequency of the laser and can meet the application requirement for demanding imaging time.

Description

technical field [0001] The invention belongs to the technical field of photoelectric instruments, and specifically refers to a laser scanning three-dimensional imaging radar and a method based on a linear array APD detector. It is suitable for occasions that require high speed of 3D imaging, such as spacecraft automatic landing navigation, space rendezvous and docking navigation, etc. Background technique [0002] The concept of Lidar (LIDAR: LIght Detection and Ranging) originated from microwave radar and is based on laser ranging technology. It can measure the distance information between the object and the sensor, and usually completes a large-scale measurement through a scanning mechanism, and then can invert the digital elevation model (DEM) of the target or a three-dimensional image of the target. Due to its outstanding three-dimensional configuration capabilities, lidar technology is widely used in many fields such as surveying and mapping, industrial production, mil...

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Application Information

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IPC IPC(8): G01S17/89G01S17/08G01S7/481
Inventor 舒嵘卜弘毅童鹏孟昭华毛闵军金辉
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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