公开(公告)号：US20150043004A1

公开(公告)日：2015-02-12

申请号：US14378880

申请日：2012-11-08

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Jiubin Tan ,  Pengcheng Hu ,  Xiaofei Diao

IPC: G01B9/02 ,  G01B11/14

CPC classification number: G01B9/02007 ,  G01B9/02003 ,  G01B9/02027 ,  G01B9/02045 ,  G01B11/14 ,  G01B2290/70 ,  G01J9/04 ,  G02B27/283

Abstract: A high speed high resolution heterodyne interferometric method and system are provided. The invention uses two spatially separated beams with slightly different frequencies and has two measurement signals with opposite Doppler shift. The switching circuit selects one of the two measurement signals for displacement measurement according to the direction and speed of the target movement. In this invention, the measurement is insensitive to the thermal variation; the periodic nonlinearity is essentially eliminated by using two spatially separated beams; the measurable target speed of the interferometer is no longer limited by the beat frequency of the laser source.

Abstract translation: 提供了高速高分辨率外差干涉法和系统。 本发明使用具有稍微不同频率的两个空间分离的波束，并且具有相反多普勒频移的两个测量信号。 开关电路根据目标运动的方向和速度选择两个测量信号中的一个用于位移测量。 在本发明中，测量对热变化不敏感; 通过使用两个空间分离的光束基本上消除了周期性非线性; 干涉仪的可测量目标速度不再受激光源的拍频的限制。

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：US12247824B1

公开(公告)日：2025-03-11

申请号：US18595312

申请日：2024-03-04

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Haijin Fu ,  Xiaobo Su ,  Liang Yu ,  Pengcheng Hu ,  Zhaochen Pan ,  Zhiwei Wang

IPC: G01B11/14 ,  G01B9/02002

Abstract: A heterodyne interferometer and a measurement method based on multi-target opposite displacement measurement are provided, technical points including: An output path of the laser source is sequentially arranged with a first beam splitter and a second beam splitter arranged in parallel on left and right sides, and both of which are polarization beam splitters; a first reflector is arranged above the first beam splitter, a third reflector is arranged on a right side of the second beam splitter, a second plane reflector is arranged in front of the second beam splitter, and a first plane reflector is arranged behind the second beam splitter; the first plane reflector and the second plane reflector jointly constitute a second reflector group; a left side of the first beam splitter is provided with a first photodetector and a second photodetector. The present invention realizes the measurement of relative displacement between opposing objects.

公开(公告)号：US20250044128A1

公开(公告)日：2025-02-06

申请号：US18744803

申请日：2024-06-17

Applicant: Harbin Institute of Technology

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

IPC: G01D5/353

Abstract: A micro-probe laser frequency modulation interferometric ranging method and system, under the premise of not introducing an absolute laser rangefinder to introduce new uncertainties, continuously and slowly changes the modulated laser wavelength, resulting in a continuous periodic phase change in the interference signal obtained by the detector. The laser modulation absorption spectrum shifts from the initial locked absorption peak to another locked peak, and the wavelength changes of the two locked absorption peaks before and after are obtained by checking the table. Meanwhile, calculating the phase difference demodulated by the phase generated carrier (PGC) before and after, and the initial length of optical dead-path is calculated using wavelength scanning technology. Afterwards, utilizing the advantages of high relative distance measurement accuracy of micro-probe fiber optic laser interferometer, real-time measurement of the measured distance is achieved.

公开(公告)号：US20230384090A1

公开(公告)日：2023-11-30

申请号：US17982033

申请日：2022-11-07

Applicant: Harbin Institute of Technology

Inventor： Pengcheng Hu ,  Liang Yu

IPC: G01C9/06 ,  G01C9/08

CPC classification number: G01C9/06 ,  G01C9/08 ,  G01C2009/066

Abstract: A high-precision dual-axis laser inclinometer based on wavefront homodyne interference and a measuring method are disclosed. The method includes: obtaining a laser signal through a laser light source module, transmitting the laser signal to an integrated sensing module, and generating a wavefront interference signal based on the integrated sensing module; and inputting the wavefront interference signal into a signal processing module for performing high-precision decoupling operation to obtain a horizontal inclination angle measurement result. The measurement resolution is high, the measurement result can be directly traced to the laser wavelength, high-precision dual-axis inclination angle measurement can be realized only by using single-beam measurement light, meanwhile, the laser inclinometer has the advantages of being simple in structure, simple in light path, easy to integrate, beneficial to engineering implementation, and high in cost performance, and the requirement of high-end equipment on the ultra-precision inclinometer is met.

公开(公告)号：US11733026B2

公开(公告)日：2023-08-22

申请号：US17681148

申请日：2022-02-25

Applicant: Harbin Institute of Technology

Inventor： Liang Yu ,  Pengcheng Hu ,  Xionglei Lin ,  Xiaobo Su

IPC: G01B9/02 ,  G01B11/00 ,  G01B11/26

CPC classification number: G01B9/02 ,  G01B9/02083 ,  G01B11/005 ,  G01B11/26

Abstract: A single-beam three-degree-of-freedom homodyne laser interferometer based on an array detector. A single-frequency laser beam is input to a Michelson interference structure, the measurement beam and the reference beam perform non-coaxial interference and form a single-beam homodyne interference signal by setting the angle of a reference plane mirror, the array detector is selected to effectively receive the single-beam homodyne interference signal, and finally, three-degree-of-freedom signal linear decoupling on the single-beam homodyne interference signal is achieved through a three-degree-of-freedom decoupling method based on Lissajous ellipse fitting. The laser interferometer does is free of angle decoupling nonlinearity, the period nonlinear error is remarkably reduced, compared with other existing three-degree-of-freedom laser interferometers, the laser interferometer has the advantages of being simple in structure, large in angle measurement range and easy to integrate, and the high-precision requirement of the three-degree-of-freedom laser interferometer for displacement and angle measurement is met.

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.

公开(公告)号：US11581695B2

公开(公告)日：2023-02-14

申请号：US17022343

申请日：2020-09-16

Applicant: Harbin Institute of Technology

Inventor： Hongxing Yang ,  Yun Zou ,  Ziqi Yin ,  Jing Li ,  Pengcheng Hu ,  Jiubin Tan

IPC: H01S3/131 ,  G01K1/02 ,  H01S3/13 ,  H05B1/02 ,  G02B27/28

Abstract: The disclosure provides a high-frequency-reproducibility laser frequency stabilization method and device based on multi-point acquisition of laser tube temperature. The laser frequency stabilization device includes: a frequency stabilization control circuit. The frequency stabilization control circuit includes a polarizing beam splitter, an optical power conversion circuit, an A/D conversion circuit, a temperature measuring circuit, a microprocessor, a D/A converter and a heating film driver. The polarizing beam splitter is disposed outside any one of laser transmitting holes. The optical power conversion circuit is disposed on reflection and refraction optical paths of the polarizing beam splitter. The optical power conversion circuit, the A/D conversion circuit, the microprocessor, the D/A converter, the heating film driver and a plurality of groups of heating films are sequentially in one-way connection. Temperature sensors, the temperature measuring circuit and the microprocessor are sequentially in one-way connection.

公开(公告)号：US09587927B2

公开(公告)日：2017-03-07

申请号：US14378880

申请日：2012-11-08

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Jiubin Tan ,  Pengcheng Hu ,  Xiaofei Diao

IPC: G01B9/02 ,  G01J9/04 ,  G01B11/14 ,  G02B27/28

CPC classification number: G01B9/02007 ,  G01B9/02003 ,  G01B9/02027 ,  G01B9/02045 ,  G01B11/14 ,  G01B2290/70 ,  G01J9/04 ,  G02B27/283

Abstract: A high speed high resolution heterodyne interferometric method and system are provided. The invention uses two spatially separated beams with slightly different frequencies and has two measurement signals with opposite Doppler shift. The switching circuit selects one of the two measurement signals for displacement measurement according to the direction and speed of the target movement. In this invention, the measurement is insensitive to the thermal variation; the periodic nonlinearity is essentially eliminated by using two spatially separated beams; the measurable target speed of the interferometer is no longer limited by the beat frequency of the laser source.

Abstract translation: 提供了高速高分辨率外差干涉法和系统。 本发明使用具有稍微不同频率的两个空间分离的波束，并且具有相反多普勒频移的两个测量信号。 开关电路根据目标运动的方向和速度选择两个测量信号中的一个用于位移测量。 在本发明中，测量对热变化不敏感; 通过使用两个空间分离的光束基本上消除了周期性非线性; 干涉仪的可测量目标速度不再受激光源的拍频的限制。

公开(公告)号：US20170052025A1

公开(公告)日：2017-02-23

申请号：US15307300

申请日：2015-03-31

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Pengcheng Hu ,  Jiubin Tan ,  Jiahao Guo

IPC: G01C9/20 ,  G01C9/18 ,  G01C9/06

CPC classification number: G01C9/20 ,  G01C9/00 ,  G01C9/06 ,  G01C9/18 ,  G01C2009/062 ,  G01C2009/185

Abstract: A method for measuring a dip angle of oppositely crossly placed paired quartered ring-quartered circle nested polar plates. An annular coplanar capacitance measuring head of a sensor unit consists of four quarter round metal plates and four quarter circular-ring-shaped metal plates, the eight metal plates are coplanar and concentric with one another, and a quarter round metal plate and a quarter circular-ring-shaped metal plate corresponding to the same sector angle form a capacitor. Two annular coplanar capacitance measuring heads are arranged on two round insulating substrates, the two round insulating substrates are used as two bottom surfaces of a cylindrical container, the cylindrical container is transversely arranged, and an insulating liquid equal to ½ volume of the cylindrical container is injected into the cylindrical container in a sealing manner. Potential leads extract potentials of the sixteen metal plates and are connected to an input end of a capacitance measuring unit, and the capacitance measuring unit is connected to a dip measuring unit. When the cylindrical container tilts, the relative positions of the two annular coplanar capacitance measuring heads and the insulating liquid are changed, and a dip angle value can be calculated by measuring the change of a capacitance value. Also disclosed is a device for measuring a dip angle of oppositely crossly placed paired quartered ring-quartered circle nested polar plates.

Abstract translation: 用于测量相对交叉配对的四分之一环四极嵌套极板的倾角的方法。 传感器单元的环形共面电容测量头由四个四分之一圆形金属板和四个四分之一圆环形金属板组成，八个金属板彼此共面和同心，四分之一圆形金属板和四分之一圆形 对应于相同扇形角的环形金属板形成电容器。 两个环形共面电容测量头设置在两个圆形绝缘基板上，两个圆形绝缘基板用作圆柱形容器的两个底面，圆柱形容器横向布置，等于圆柱形容器的1/2体积的绝缘液体为 以密封方式注入圆筒形容器中。 潜在引线提取十六个金属板的电位，并连接到电容测量单元的输入端，电容测量单元连接到倾斜测量单元。 当圆筒形容器倾斜时，两个环形共平面电容测量头和绝缘液体的相对位置改变，并且可以通过测量电容值的变化来计算倾角值。 还公开了一种用于测量相对交叉配对的四分之一环四极嵌套极板的倾角的装置。