Multielement photon counting laser ranging three-dimensional imaging system

A technology of laser distance measurement and three-dimensional imaging, which is applied in the direction of radio wave measurement system, measurement device, electromagnetic wave reradiation, etc., can solve the problem of long measurement time and achieve the effect of improving measurement speed

Active Publication Date: 2014-11-26
EAST CHINA NORMAL UNIV
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Problems solved by technology

However, for the three-dimensional imaging of multi-element laser ranging, due to the lack of high-performance single-photon detector arrays, a single beam is usually used to scan point by point, and the measurement time is relatively long. Research Difficulties

Method used

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  • Multielement photon counting laser ranging three-dimensional imaging system

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Embodiment

[0026]The laser emitting unit A includes a pulse laser 11 with a repetition rate of 10K, a high-speed linear photodetector 12, a laser beam expander 13 for 3 times beam expansion, a dielectric film high reflection mirror 14, an ordinary high reflection mirror 15, a Damman grating (DOE ) 16; a very small part of the laser pulse is transmitted through the dielectric film high mirror 14 and enters the high-speed linear photodetector 12, and the detected pulse signal is recorded by the time measurement unit D as the synchronization signal of the laser pulse. Ordinary high-reflection mirror 15 adjusts the reflection direction of the laser beam so that it is completely vertically incident on laser beam expander 13, and the single beam output by laser beam expander 13 is vertically irradiated to the DOE element. The DOE component splits a single beam of incident light into a one-dimensional beam array, in which the angles between two adjacent beams are equal, and the divergence angle ...

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Abstract

The invention discloses a multielement photon counting laser ranging three-dimensional imaging system. The system comprises a laser emitting unit used for emitting beam arrays, a control unit for controlling the beam arrays to be emitted and scanned, a receiving and detecting unit which receives echo optical signals through an optical lens and detects focal plane optical signals through a single-photon detector array formed by coupling optical fiber arrays, and a time measurement unit used for recording and analyzing multi-channel photon flying time. According to multielement photon counting three-dimensional imaging system, the single-photon detector array formed by coupling optical fiber arrays is used, multielement photon counting laser ranging of one-dimensional laser beam arrays is achieved, one-dimensional scanning is performed on the beam arrays in the vertical direction of arrangement of the beam arrays, and photon counting three-dimensional laser imaging is achieved.

Description

technical field [0001] The invention relates to the fields of laser ranging and three-dimensional imaging, in particular to a three-dimensional imaging system that uses a single-photon detector array coupled with an optical fiber array to realize multi-element photon counting laser ranging. Background technique [0002] Laser ranging and 3D imaging systems have important application value in surveying and mapping. With the continuous improvement of measurement distance, people began to use single photon detectors and time-correlated coincidence counting methods to measure echo signals, which greatly improved the ranging performance. However, for the three-dimensional imaging of multi-component laser ranging, due to the lack of high-performance single-photon detector arrays, a single beam is usually used to scan point by point, and the measurement time is relatively long. Research Difficulties 。 Contents of the invention [0003] The purpose of the present invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08G01S17/89
CPCG01S7/484G01S7/4861G01S7/4865G01S17/14G01S17/89
Inventor 吴光冯百成师亚帆鲍泽宇李召辉杜秉承颜佩琴
Owner EAST CHINA NORMAL UNIV
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