Laser 3D (three-dimensional) imaging system based on liquid crystal phased array and streak tube

A laser three-dimensional imaging, liquid crystal phase technology, applied in radio wave measurement system, electromagnetic wave re-radiation, utilization of re-radiation and other directions, can solve the problem that the scanning accuracy is difficult to achieve, the response speed and control accuracy of the mechanical deflection method are difficult to meet the high performance Lidar, flexibility limitations, etc.

Inactive Publication Date: 2012-05-02
BEIHANG UNIV
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Problems solved by technology

[0003] The current laser radar mostly adopts mechanical beam guidance, that is, two-way servo control system is used to control the radar bracket or mirror to make two-dimensional movement of azimuth and pitch. The response speed and control accuracy of the mechanical deflection method are difficult to meet the requirements of high-performance laser radar. And because it is inertial scanning, the flexibility is greatly limited
The sub-microarc level scanning accuracy usually required by the system is difficult to achieve with the existing mechanical beam guidance system

Method used

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  • Laser 3D (three-dimensional) imaging system based on liquid crystal phased array and streak tube
  • Laser 3D (three-dimensional) imaging system based on liquid crystal phased array and streak tube

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Embodiment Construction

[0027] The present invention provides a kind of laser three-dimensional imaging system based on liquid crystal phased array and single slit stripe tube, and it is composed of integrated information processor 1, pulse laser 2, collimating emission lens 3, one-dimensional Dammann grating 4, emission- Receiving beam splitter 5, one-dimensional liquid crystal phased array 6, CCD7, single slit stripe tube 8, relay lens 9, single slit 10, objective lens 11, receiving beam splitter 12, PIN photodiode 13, delayer 14, Slope voltage generator 15, synchronous control circuit 16, programmable controller 17, transmit-receive lens 18 are made up. The positional relationship between them is: the transmitting subsystem and the receiving subsystem are located at the front end of the system, and the synchronous control circuit and the integrated information processor are located at the rear end of the system.

[0028] The transmitting subsystem is composed of a pulsed laser 2 , a collimating tr...

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Abstract

The invention provides a laser 3D (three-dimensional) imaging system based on a liquid crystal phased array and a single-slit streak tube. The system comprises a transmitting sub-system, a receiving sub-system, a synchronous control circuit and a comprehensive information processor, wherein the transmitting sub-system and the receiving sub-system are located on the front end of the system; and the synchronous control circuit and the comprehensive information processor are located on the rear end of the system. Through the combination of the liquid crystal phased array and the single-slit streak tube, the laser 3D imaging system can be used for smartly controlling the laser emergent direction, and improving the system accuracy, the operation distance, the time resolution, the spatial resolution, the spectral range and the dynamic response range while obviating mechanical scanning; and the system is further miniaturized. The system is scientific in conception and novel in structure, and can be used in the fields of mapping, aerospace, industry and so on.

Description

(1) Technical field [0001] The invention relates to a laser three-dimensional imaging system integrating light, machine and electricity. The system is a laser three-dimensional imaging system based on a liquid crystal phased array and a single-slit striped tube. The system belongs to the technical field of laser radar imaging. (2) Background technology [0002] Lidar imaging technology is widely used in terrain mapping, navigation, and aerospace fields in target detection, tracking, targeting, and imaging recognition due to its extremely high frequency, air, and time domain resolution. [0003] The current laser radar mostly adopts mechanical beam guidance, that is, two-way servo control system is used to control the radar bracket or mirror to make two-dimensional movement of azimuth and pitch. The response speed and control accuracy of the mechanical deflection method are difficult to meet the requirements of high-performance laser radar. And because it is inertial scannin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01S7/481
Inventor 李丽党二升刘丽吴磊李栋
Owner BEIHANG UNIV
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