公开(公告)号：US20250085424A1

公开(公告)日：2025-03-13

申请号：US18955708

申请日：2024-11-21

Applicant: DENSO CORPORATION

Inventor： Chihiro MORIGUCHI ,  Naoki YOSHIMOTO ,  Tetsuya SHIMOGAKI ,  Tatsuya YAMASHITA ,  Makoto NAKAI

IPC: G01S17/34 ,  G01S7/4915 ,  G01S17/36 ,  G01S17/931

Abstract: A frequency sweep characteristic measurement device splits the laser light to generate a difference in lengths of optical paths and combines the split laser lights to generate a combined light. This device receives the combined light, converts the received light into a beat signal, and outputs the beat signal. Further, this device adjusts a waveform so that an amplitude and a phase match at both ends of the beat signal, calculates a quadrature component by performing a Hilbert transform on the beat signal whose waveform has been adjusted, and calculates an instantaneous phase of the beat signal by calculating an inverse tangent of the quadrature component and the beat signal whose waveform has been adjusted. This device calculates the frequency sweep characteristic of the laser light based on the instantaneous phase and the difference in the lengths of the optical paths.