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Large dynamic range optical sub-field detection lidar

A large dynamic range, laser detection technology, applied in measuring devices, radio wave measuring systems, instruments, etc., can solve problems affecting signal output stability, high noise of detectors and circuits, etc., to ensure integrity and signal stability , Overcome signal saturation and improve the effect of detecting dynamic range

Active Publication Date: 2017-11-10
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

This technology has been widely used in ranging and atmospheric detection lidar, but in strong scattering medium, the rise time of the variable gain curve is often shortened to less than a hundred nanoseconds, such a high-speed gain change will bring great harm to the detector and the circuit. Higher noise affects the stability of signal output

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  • Large dynamic range optical sub-field detection lidar

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with example and accompanying drawing, but should not limit protection scope of the present invention with this.

[0032] see first figure 1 , figure 1 It is a structural block diagram of the large dynamic range optical field-of-view detection lidar of the present invention. It can be seen from the figure that the large dynamic range optical field-of-view detection lidar of the present invention includes a laser 1, a beam expander 2, a folding mirror 3, and a main receiver Lens 4, sub-field mirror 5, small field of view conversion lens group 6, large field of view conversion lens group 7, small field of view detector 8 and large field of view detector 9, the connection relationship of the above components is as follows:

[0033] The laser 1 generates pulsed laser light, passes through the beam expander mirror 2 and the folding mirror 3 and reaches the front of the receiving main lens 4, and emits alon...

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Abstract

Large dynamic range detection laser radar for an optical sub-view field includes a laser, a beam expanding lens, a bending lens, a reception main lens, a sub-view field lens, a small view field transform lens assembly, a large view field transform lens assembly, a small view field detector and a large view field detector. The large dynamic range detection laser radar for the optical sub-view field is characterized in that the optical sub-view field reception is used to separate strong and weak laser echo signals. The detection dynamic range of a laser radar system is expanded, and the integrity and the stability of two channel signals in the time and in the intensity are guaranteed. The detection dynamic range of the laser radar system in the strong scattering mediums such as water and mist is effectively improved.

Description

technical field [0001] The invention relates to a laser radar, in particular to a large dynamic range optical field-of-view detection laser radar. The laser radar system has a higher detection dynamic range and is more suitable for target detection in strong scattering media such as water and fog. Background technique [0002] Lidar detects targets in strong scattering media such as water and fog. Due to the strong attenuation caused by strong scattering media, the distance attenuation of the target echo signal is much more serious than the attenuation in the conventional atmosphere. The detection dynamic range puts forward higher requirements. At present, the commonly used ways to improve the detection dynamic range of lidar in strong scattering media mainly include fixed ratio sub-channel technology, logarithmic amplification technology, polarization technology, gating and synchronous variable gain technology. [0003] The fixed-ratio sub-channel technology is to install ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/481G01S17/88
CPCG01S7/481G01S17/88
Inventor 贺岩刘继桥耿立明陈卫标
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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