Chinese Optics Letters, 2015, 13 (5): 051301, Published Online: Sep. 20, 2018   

Compact grating displacement measurement system with a 3 × 3 coupler

Author Affiliations
College of Mechatronic Engineering and Automation, National University of Defense Technology, Changsha 410073, China
Abstract
We present a compact displacement measurement system possessing the capability of nanometer-scale precision. On basis of integrating single grating with 3×3 coupler for phase shift in interference signal, the present scheme features advantages of simple structure, convenient alignment, and insensitivity to air turbulence. Linear comparisons between our system and HP5530 show a residual error less than 81 nm during step motions along a 10 mm round-trip, and a discrepancy less than 15 nm in the case of 200 μm movement. We also demonstrate a measurement stability test in a duration of 300 s, which shows the proposed scheme potentially performs better than HP5530 in terms of long-term stability.

Chunhua Wei, Shuhua Yan, Cunbao Lin, Zhiguang Du, Guochao Wang. Compact grating displacement measurement system with a 3 × 3 coupler[J]. Chinese Optics Letters, 2015, 13(5): 051301.

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