A5049599606- Advanced Measurement and Metrology Techniques
- Advanced Fiber Laser Technologies
- Optical measurement and interference techniques
- Calibration and Measurement Techniques
- Advanced Sensor Technologies Research
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Laser Design and Applications
- Surface Roughness and Optical Measurements
- Scientific Measurement and Uncertainty Evaluation
- Advanced Optical Sensing Technologies
- Gear and Bearing Dynamics Analysis
- Sensor Technology and Measurement Systems
- Machine Fault Diagnosis Techniques
- Scientific Research and Discoveries
- Inertial Sensor and Navigation
Harbin Institute of Technology
2020-2024
Ministry of Industry and Information Technology
2020-2023
Shandong University of Science and Technology
2018
We propose an absolute distance measurement method that employs heterodyne and superheterodyne combined interferometers to achieve synchronous detection demodulation of multiwavelengths. Coarse fine synthetic wavelengths are generated by a dual-longitudinal-mode He–Ne laser four acoustic optical frequency shifters. Further, improve phase synchronization for multiwavelengths, we analyze the characteristics coarse signals adopt suitable both signals. Experimental results demonstrate proposed...
Heterodyne interferometers with two opposite Doppler shift interference signals have been proposed for high-resolution measurement high speed, which can be used in the background of high-speed measurement. However, a error model heterodyne (HSHR-HIs) has not yet proposed. We established HSHR-HI model, analyzed influence beat frequency stability simplified optical structure, and then designed an offset-locked dual-frequency laser source digital control system to reduce impact drift....
A high-precision, high environmental adaptability thermometer based on proportional divider resistance is proposed for high-precision temperature measurement in a spaceborne environment subjected to large variations. In this method, constant voltage source was used instead of the traditional current increase short-term stability measurement. The drift characteristics system were analyzed and compensated by self-calibration reference method. Based above-mentioned minimum noise requirements...
Grating interferometers that measure in-plane and out-of-plane displacements are not only effective two-degree-of-freedom (DOF) sensors, but also basic units of six-DOF measurement systems. Besides resolution accuracy, periodic nonlinear errors, misalignment tolerance, size reading heads more crucial than ever. In this work, a spatially separated heterodyne grating interferometer measures in- is proposed. A prototype with 3 mm diameter beams 69 × 51 41 was built tested. The experiment...
An operating point control method is proposed for the Mach-Zehnder modulator (MZM) based on a dual-cascaded MZM structure. Unlike traditional methods with dither signals, advantageous because components monitored in process are not masked by spectrum noise floor and drift direction clearly determined at quadrature point, thus imparting greater stability. Additionally, suitable phase-shift laser range finders (PSLRFs). Compared methods, experimental results reveal that increases stability of...
Multiple-beam grating interferometry, a hybrid of the multiple-beam interference and is introduced conducted by building Littrow-type cavity with diffraction grating. Based on multi-beam mathematical derivation reveals that fringes interferometry follow general form Airy formulae, while period which additively determined phases from pitches laser wavelength. Two crucial parameters, peak transmission finesse describing brightness sharpness fringes, are defined investigated, whose results...