公开(公告)号：US12259240B1

公开(公告)日：2025-03-25

申请号：US18663403

申请日：2024-05-14

Applicant: Harbin Institute of Technology

Inventor： Ruitao Yang ,  Hao Sun ,  Pengcheng Hu

IPC: G01B9/02001 ,  G01B9/02 ,  G01B9/02003 ,  G01B11/02

Abstract: A distance measurement device and method based on secondary mixing of inter-mode self-interference signals of optical frequency combs are provided, which relate to the field of high precision laser distance measurement technologies. A dual-comb light source emits a dual-comb laser into a detection optical module to obtain the inter-mode self-interference signals carrying the to-be-measured distance information. The detection optical module outputs the inter-mode self-interference signals into a generation, acquisition and calculation module of inter-mode self-interference secondary mixing signals to generate the inter-mode self-interference secondary mixing signals, to thereby achieve signal acquisition and obtain a distance measurement result. In this device, coarse and fine distance measurements at different scales are achieved, measurement range and accuracy can be effectively balanced by combing intermediate transition measurement scales and inter-stage transition method, strong real-time property of measurement is achieved, and the light source has low cost and the scale of the system is small.

公开(公告)号：US12199407B1

公开(公告)日：2025-01-14

申请号：US18751413

申请日：2024-06-24

Applicant: Harbin Institute of Technology

Inventor： Yisi Dong ,  Wenwen Li ,  Wenrui Luo ,  Chen Zhang ,  Jinran Zhang ,  Pengcheng Hu ,  Ruitao Yang

IPC: H01S5/0687 ,  H01S3/13 ,  H01S5/026 ,  H01S5/06 ,  H01S5/068

Abstract: A frequency stabilization method and system for tunable light sources based on characteristic curve reconstruction are provided, which relate the field of frequency stabilization technologies of modulation absorption spectrum. A set of frequency stabilization control method and system based on internal modulation absorption spectroscopy of light source is constructed, and a high-precision laser frequency stabilization method under large-amplitude and high-bandwidth frequency modulation based on frequency discrimination curve reconstruction is proposed to solve a problem that it is difficult for micro-probe laser interferometry measurement benchmark to balance large-amplitude and high-bandwidth frequency modulation, and high-precision frequency stabilization, resulting in that it is difficult to obtain high relative accuracy measurement under large-range measurement. Under the large-amplitude and high-bandwidth frequency modulation, a distortion model of the frequency discrimination curve and a distortion correction model are constructed, which is used for feedback adjustment of phase compensation and reconstructing the frequency discrimination curve.

公开(公告)号：US12281946B1

公开(公告)日：2025-04-22

申请号：US18942832

申请日：2024-11-11

Applicant: Harbin Institute of Technology

Inventor： Hongxing Yang ,  Shiyuan Lin ,  Ziqi Yin ,  Yan Wang ,  Pengcheng Hu ,  Ruitao Yang

IPC: G01K3/08 ,  G01K7/16

Abstract: A differential proportional temperature measurement circuit and method based on bidirectional constant voltage drive is proposed. The circuit and method applied to the precision temperature measurement of spacecraft, the main components include a bidirectional constant voltage source proportional bridge circuit, a differential and single-ended amplifier circuit, an analog-to-digital conversion circuit, a digital filter circuit, a data processing circuit and an isolated filter power supply circuit. The method adopts the bidirectional constant voltage drive technology, and enlarges and measures the difference between the voltage values of the reference resistor and the resistance to be measured by improving the sensing bridge of the ordinary commutation proportional method, and suppresses the long-term drift of the excitation unit and the voltage measurement unit. The method can meet the requirements of temperature measurement resolution of μK magnitude and the power spectral density of μK/Hz1/2 (0.1 mHz-1 Hz) magnitude in aerospace temperature measurement systems.

公开(公告)号：US20230243700A1

公开(公告)日：2023-08-03

申请号：US17963254

申请日：2022-10-11

Applicant: Harbin Institute of Technology

Inventor： Ruitao Yang ,  Pengcheng Hu ,  Jiubin Tan

IPC: G01J3/28 ,  G01J3/12 ,  G01J3/02

CPC classification number: G01J3/28 ,  G01J3/12 ,  G01J3/0218

Abstract: The present disclosure provides an approximation-free and iteration-free method for spectral analysis of an intracavity electro-optic modulation type optical frequency comb, a device and a medium. The method includes: calculating a residual phase delay of a single propagation of laser in a resonant cavity, analyzing outgoing transmission characteristics of a light source of the intracavity electro-optic modulation type optical frequency comb, accumulating laser electric field intensities corresponding to all cyclic propagation times n to obtain an outgoing laser electric field intensity E, obtaining a new approximate-free outgoing laser electric field intensity E′ of the intracavity electro-optic modulation type optical frequency comb, obtaining an outgoing laser electric field intensity Ek′ of kth-order comb teeth, calculating an outgoing laser light intensity Ik of the kth-order comb teeth and accurately analyzing a spectrum of the intracavity electro-optic modulation type optical frequency comb, determining a working state according to a simulated spectral envelope curve, and guiding the subsequent optimization design and debugging. The method for the spectral analysis of the optical frequency comb is higher in accuracy without approximation and faster in speed without iteration, and can analyze the spectrum of the intracavity electro-optic modulation type optical frequency comb according to any known working mode.