High-precision micro-displacement sensing based on an optical filter and optoelectronic oscillators

被引:3
|
作者
Luo, Hao [1 ]
Yu, Jinlong [1 ]
Wang, Ju [1 ]
Ma, Chuang [1 ]
Han, Xu [1 ]
Su, Xuemin [1 ]
机构
[1] Tianjin Univ, Sch Elect & Informat Engn, Tianjin 300072, Peoples R China
基金
中国国家自然科学基金;
关键词
HETERODYNE GRATING INTERFEROMETER;
D O I
10.1364/OE.493068
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
High-precision micro-displacement sensing based on an optical filter and optoelectronic oscillators (OEOs) is proposed and experimentally demonstrated. In this scheme, an optical filter is utilized to separate the carriers of the measurement and reference OEO loops. Through the optical filter, the common path structure can be consequently achieved. The two OEO loops share all optical/electrical components, except for the micro-displacement to be measured. Measurement and reference OEOs are alternately oscillated by using a magneto-optic switch. Therefore, self-calibration is achieved without additional cavity length control circuits, greatly simplifying the system. A theoretical analysis of the system is developed, and this analysis is then demonstrated with experiments. Regarding the micro-displacement measurements, we achieved a sensitivity of 312.058 kHz/mm and a measurement resolution of 356 pm. The measurement precision is less than 130 nm over a measurement range of 19 mm.
引用
收藏
页码:19278 / 19292
页数:15
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