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The reporter learned from the Research Group of Liu Bo, a researcher at the Institute of Optics and Electronics of the Chinese Academy of Sciences on the 6th, that the research group has made breakthroughs in the research of the three-dimensional imaging laser lidar, and for the first time put forward a combination of dual polarization modulation technology and adaptive distance gating. The three-dimensional imaging method, related research results published in the "IEEE Optoelectronics Technology Express" and the top international journal of applied optics "applied optics", and has applied for patents for inventions.
“If we compare the lidar to the object as a blind person,†Liu Bo metaphorically stated. “The traditional single-point scanning lidar is like touching a object with one finger. It takes a lot of touches to have an overall impression of the object. And the area array 3D imaging laser radar is like a giant palm that can quickly sense objects."
The reporter learned that Liu Bo's new method for the research group uses high-sensitivity electron multiplying charge-coupled devices as an area array detector, uses dual-channel high-speed electro-optical polarization modulation technology, and combines adaptive distance gating to achieve three-dimensional imaging, breaking the tradition Scanning imaging laser radar can not limit the imaging of long-range dynamic targets, but also overcomes the disadvantage of low resolution of imaging using APD array detectors.
Liu Bo said that this method splits the echo beam into two by using a polarization modulation spectroscopic technique and simultaneously performs imaging so that only a single laser pulse is emitted to complete the reconstruction of the distance and obtain a frame of three-dimensional images. "The ability of three-dimensional imaging meets the need for morphological recognition and three-dimensional morphological analysis of highly dynamic targets.
"In the future, such radars can be used in space applications, such as spatial distance sensing and three-dimensional morphometry, or on unmanned vehicles." Liu Bo said that it is still in the stage of the prototype and the entire system is relatively large. The next step will focus on improving the system performance and miniaturization.
(Original title: Lidar "Flash" 3D Imaging)
In the near future, in China's "eye" of laser radar, objects that are moving at a high speed in the distance will no longer be a two-dimensional plane image, but will be presented in a deep three-dimensional form.