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公开(公告)号：US12050271B2
公开(公告)日：2024-07-30
申请号：US17278306
申请日：2019-06-03
IPC分类号： G01S17/89 , G01S7/48 , G01S17/894 , G02F1/295 , G01S7/481
CPC分类号： G01S17/894 , G01S7/4808 , G02F1/295 , G01S7/4818
摘要： [Problem] To provide a camera with high sensitivity even if an output to the outside is weak. [Solution] This camera includes a light source 3, a demultiplexing unit 5 which demultiplexes light from the light source 3 into first demultiplexed light and second demultiplexed light, a first modulator 7 which modulates the first demultiplexed light to obtain a modulated signal, an emission unit 9 which emits the modulation signal modulated by the first modulator 7, and a phase imparting means 11 which imparts a plurality of types of phase shifts to the second demultiplexed light to obtain phase-imparted local light. The camera further includes a multiplexing unit 13 which multiplexes light incident from the outside of the camera and the phase-imparted local light and obtains multiplexed light, a light receiving element 17 which detects the multiplexed light, and includes a light receiving unit 15, and an analysis processing unit 19 which, on the basis of the multiplexed light received by the light receiving element 17, analyzes the position of a subject or the distance between the subject and the camera.
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2.发明授权公开(公告)号：US10608748B2
公开(公告)日：2020-03-31
申请号：US16080661
申请日：2017-02-23
IPC分类号： H04B10/61 , G01M11/02 , H04B10/073
摘要： To provide a method and device capable of easily measuring the CMRR vs. frequency characteristics of an optical receiver. Light having a measurement frequency (ω [hz]) is split into two different paths, and a first optical two-tone signal, which is signal light and has a frequency difference (ω−Δω [hz]), and a second optical two-tone signal, which is local light and has a frequency difference (ω+Δω [hz]), are obtained and input into a coherent receiver to be measured, wherein electrical signals output from the receiver are measured to obtain both the ratio of the intensity of a signal component having the frequency ω−Δω [hz] to the intensity of a signal component having the frequency ω [hz], which corresponds to the CMRR on the signal light side, and the ratio of the intensity of a signal component having the frequency ω+Δω [hz] to the intensity of the signal component having the frequency ω [hz], which corresponds to the CMRR on the local light side.
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