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公开(公告)号：US20200003879A1
公开(公告)日：2020-01-02
申请号：US16025499
申请日：2018-07-02
Applicant: STMicroelectronics Ltd
Inventor： Guy AMOR , Tzvi PHILIPP , Elan ROTH
Abstract: A laser ranging system includes a light source emitting a beam of collimated light. A beam splitter polarizes the beam with a first type of linear polarization. A wave plate receives the beam from the beam splitter and polarizes the beam with a circular polarization. A movable mirror scans the beam across a target, receives a return beam from the target, and reflects the return beam toward the wave plate. The wave plate polarizes the return beam with a second type of linear polarization. The beam splitter receives the return beam from the wave plate. A detector detects arrival of the return beam from the beam splitter. A circuit receives determines a distance to the target as a function of a time interval between emission of the beam and arrival of the return beam.
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