Light amplification type three-dimensional imaging method and system

Abstract

The invention discloses a light amplification type three-dimensional imaging method and a system. A first output of a sequence scheduling control module controls a pulsed laser to emit intense pulsed lights; the intense pulsed lights irradiate at an object to be tested after penetrating through a beam expanding system; returned signal lights enter into a light amplification module for amplifying after penetrating through an imaging system; after the amplified lights are split, part of lights are received by a first vidicon after penetrating through a gainmodulation receiver, and the other parts of lights are received by a second vidicon; and the other three routes of the sequence scheduling control module respectively control the light amplification module, the gainmodulation receiver and an image processing module. Images obtained by the two vidicons are processed by the image processing module, and the distances from each pixel point of the image to the object are worked out to obtain the three-dimensional image of the object. Under the conditions that the light source power and the gate time are not changed, the invention can reduce the influence of random shot noise to signal lights and improve the precision of ranging.

Description

technical field [0001] The invention relates to a three-dimensional imaging method and system, in particular to an optical amplification type three-dimensional imaging method and system. Background technique [0002] With the advancement of human science and technology and the development needs of society, applications such as aircraft and other high-speed aircraft navigation, over-the-horizon all-weather target recognition and tracking, and high-precision geographical and landform surveys have put forward extremely high requirements for long-distance target detection. The rapid development of 3D imaging lidar provides a new research direction for people to solve problems such as long-distance detection. However, when the traditional three-dimensional imaging lidar system detects distant targets, the signal-to-noise ratio of the captured optical signal is low, so it is difficult to improve the performance in terms of ranging resolution. Therefore, the study of high-performa...

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Problems solved by technology

[0004] The applicant once proposed a scannerless pulse modulation 3D imaging method and system (Patent No. 20051004946.3). The measurement accuracy of this system has nothing to do with the shape of the emitted laser pulse. It should not be too large, and the aperture of the receiving optical system should not be too large and other factors, so that the optical signal obtained by the detector is weak, resulting in a decrease in the signal-to-noise ratio and a decrease in measurement accuracy

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