Dual-frequency laser interferometry of rotating angle measurement with a grating wedge-plate

2002 ◽  
Author(s):  
Wei Tao ◽  
Zhaobang Pu ◽  
Zhuo Zhang
Keyword(s):  
Laser Interferometry ◽  
Angle Measurement ◽  
Dual Frequency ◽  
Frequency Laser ◽  
Wedge Plate

Measurement of Air Refractive Index Based on Surface Plasmon Resonance and Phase Detection by Dual-Frequency Laser Interferometry

2013 ◽  
Vol 40 (1) ◽  
pp. 0108001 ◽  
Author(s):  
陈强华 Chen Qianghua ◽  
罗会甫 Luo Huifu ◽  
王素梅 Wang Sumei ◽  
王锋 Wang Feng ◽  
陈新华 Chen Xinhua
Keyword(s):  
Refractive Index ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Laser Interferometry ◽  
Phase Detection ◽  
Dual Frequency ◽  
Frequency Laser

Corner-Expansion Flow of Ionized Argon

1971 ◽  
Vol 49 (21) ◽  
pp. 2671-2679 ◽  
Author(s):  
O. Igra ◽  
I. I. Glass
Keyword(s):  
Room Temperature ◽  
Electron Number Density ◽  
Laser Interferometry ◽  
Total Density ◽  
Number Density ◽  
Dual Frequency ◽  
Electron Number ◽  
Recombination Rate Constant ◽  
Initial Shock ◽  
Frequency Laser

The recombination rate constant for ionized argon as a function of temperature was determined by using dual-frequency laser interferometry to measure total density and electron number density in a 15° corner-expansion flow. The flow was induced by a normal shock wave in a 4 in. × 7 in. (10.2 cm × 17.8 cm) hypervelocity shock tube over a range of initial shock Mach numbers [Formula: see text] and pressures [Formula: see text] Torr at room temperature T1 ~ 300 °K, with impurity levels less than 150 parts per million.

Amplification of Dual-Frequency Laser for Photonic Millimeter-Wave Signal Generation

2014 ◽  
Vol 34 (11) ◽  
pp. 1114003
Author(s):  
胡淼 Hu Miao ◽  
张飞 Zhang Fei ◽  
张翔 Zhang Xiang ◽  
郑尧元 Zheng Yaoyuan ◽  
孙骁 Sun Xiao ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Signal Generation ◽  
Dual Frequency ◽  
Wave Signal ◽  
Frequency Laser

Effect of Time-Frequency Disturbance on Performance of Dual-Frequency Laser Coherent Detection System

2016 ◽  
Vol 53 (6) ◽  
pp. 061403 ◽  
Author(s):  
张建华 Zhang Jianhua ◽  
杨德钊 Yang Dezhao ◽  
高洁 Gao Jie ◽  
刘锡民 Liu Ximin
Keyword(s):  
Detection System ◽  
Coherent Detection ◽  
Dual Frequency ◽  
Time Frequency ◽  
Frequency Laser

Experimental Study of the Dual-Frequency Laser Based on the Nd∶YVO4/Nd∶GdVO4 Combined Crystal

2018 ◽  
Vol 55 (9) ◽  
pp. 091407
Author(s):  
金涛 Jin Tao ◽  
胡淼 Hu Miao ◽  
李鹏 Li Peng ◽  
范红丹 Fan Hongdan ◽  
韩宁 Han Ning ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dual Frequency ◽  
Frequency Laser

The Analysis and Design of a Large Stroke with High-Precision Polarized Laser Interferometer System

2016 ◽  
Vol 679 ◽  
pp. 129-134
Author(s):  
Wan Duo Wu ◽  
Qiang Xian Huang ◽  
Chao Qun Wang ◽  
Ting Ting Wu ◽  
Hong Xie
Keyword(s):  
High Precision ◽  
Measurement Accuracy ◽  
Laser Interferometer ◽  
Laser Interferometry ◽  
Phase Shifting ◽  
Single Frequency ◽  
Rejection Method ◽  
The Common ◽  
Frequency Laser ◽  
Polarization Phase

The technique utilizing single-frequency laser interferometry has very high measurement accuracy, but it has rigorous requirements for optical design which is affected by many factors. In order to achieve single-frequency laser interferometry with large stroke and high precision, the integral layout, the polarization phase shifting technique and the common mode rejection method are adopted to design the length interferometry system. This paper analyzes factors and design requirements which affect measurement accuracy with large stroke. Based on polarization phase shifting technique, the system employs the four-beam-signal detection technique and the common mode rejection method, to make a differential processing of four mutually orthogonal signals. Thus, the influences of zero-drift of intensity and environmental change on system are reduced. Combined with a 200 phase subdivision, the system achieves the resolution with 0.8 nm. Under the VC++ environment, the displacement measurement results are compensated and corrected according to the environmental parameters. Compared with the Renishaw XL-80 laser interferometer, the system has better stability in short term. In the measuring range of 60 mm, the effectiveness of the system is verified.

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