Three-dimensional laser imaging method based on photon counting compressive sampling phased array

A laser three-dimensional imaging and compression sampling technology, applied in the direction of electromagnetic wave re-radiation, utilization of re-radiation, measurement device, etc., can solve the problems of reducing the amount of data processing, reducing the amount of data collection, etc., to achieve good time stability, easy analysis and processing , The effect of good drift resistance

Inactive Publication Date: 2012-07-25
BEIHANG UNIV
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Problems solved by technology

Based on the compressed sampling theory, the non-scanning laser three-dimensional imaging method based on the compressed sampling of unit single photon detectors is used to directly sample the original signal, r

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  • Three-dimensional laser imaging method based on photon counting compressive sampling phased array
  • Three-dimensional laser imaging method based on photon counting compressive sampling phased array
  • Three-dimensional laser imaging method based on photon counting compressive sampling phased array

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Embodiment Construction

[0019] In the present invention, the liquid crystal optical phased array is used to modulate the illumination laser to irradiate the target according to the measurement matrix used for compressed sampling, and the number of photons returned with time is recorded by the Geiger mode avalanche photodiode APD and the time-dependent timer, and finally the image processing platform is based on the compressed sampling The restoration algorithm reconstructs the target 3D image.

[0020] See figure 1 The present invention is a photon counting compression sampling phased array laser three-dimensional imaging method, and the specific implementation steps are:

[0021] 1. The pulse signal generator generates a pulse signal with a pulse width of 2ns and a frequency of 10MHz to drive the laser to emit laser pulses. The laser is irradiated on the liquid crystal optical phased array (LC-SLM), and the liquid crystal optical phased array follows the pre-generated binary measurement matrix Th...

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Abstract

The invention provides a three-dimensional laser imaging method based on a photon counting compressive sampling phased array, which is applicable to the fields of all-weather target identification, high-precision terrain survey, precise nondestructive examination and the like, and belongs to the technical field of laser imaging and image processing. The three-dimensional laser imaging method includes steps that at first, a pulse signal generator generates pulse signals and drives a laser device to transmit laser pulse, and a liquid crystal optical phased array is adopted to modulate illuminating laser via a certain measurement matrix so as to illuminate for a target; optical pulse reflected by the target is received by a Geiger-mode avalanche photodiode, a time-correlated single photon counter is used for recording the numbers of photons returned at different time intervals, and the numbers of the photons returned at different time intervals are integrated so as to obtain a measured vector quantity; and the measured matrix and the measured vector quantity are brought into a compressive sampling recovery algorithm, so that a three-dimensional image of the target is reconstructed. The three-dimensional laser imaging method has a good practical value and a wide application prospect in the technical field of laser imaging and digital image processing.

Description

(1) Technical field [0001] The invention relates to laser three-dimensional imaging technology, which is an active optical imaging technology capable of obtaining target space information, and belongs to the technical field of laser imaging and digital image processing. (2) Background technology [0002] With the advancement of human science and technology and the development needs of society, applications such as all-weather target recognition and tracking, high-precision terrain surveying, and precision non-destructive testing have put forward extremely high requirements for target detection. Compared with other active detection methods such as radio band radar and ultrasonic (sonar) detection, laser imaging detection has the advantages of high reliability and high spatial resolution. Among them, laser three-dimensional imaging detection technology is an active optical detection technology that can comprehensively obtain target spatial information. At present, the detecto...

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Application Information

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IPC IPC(8): G01S17/89
Inventor 李丽吴磊韩学勤
Owner BEIHANG UNIV
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