Accuracy enhanced distance measurement system using double-sideband modulated frequency scanning interferometry

Xilun Chen; Xiangchuan Wang; Shilong Pan

doi:10.1117/1.OE.56.3.036114

25 March 2017 Accuracy enhanced distance measurement system using double-sideband modulated frequency scanning interferometry

Xilun Chen, Xiangchuan Wang, Shilong Pan

Author Affiliations +

Optical Engineering, Vol. 56, Issue 3, 036114 (March 2017). https://doi.org/10.1117/1.OE.56.3.036114

Abstract

An implementation of a distance measurement system using double-sideband with suppressed carrier modulation (DSB-SC) frequency scanning interferometry is proposed to reduce the variations in the optical path and improve the measurement accuracy. In this proposed system, the electro-optic DSB-SC is used to create dual-swept signals with opposite scanning directions. For each swept signal, the relative distance between the reference arm and the measuring arm is determined by the beat frequency of signals from two arms. By multiplying both beat signals, measurement errors caused by variations in the optical path can be greatly reduced. As an experimental demonstration, a vibration was introduced in the optical path length. The experimental results show that the variations can be suppressed for over 19.9 dB.

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Xilun Chen, Xiangchuan Wang, and Shilong Pan "Accuracy enhanced distance measurement system using double-sideband modulated frequency scanning interferometry," Optical Engineering 56(3), 036114 (25 March 2017). https://doi.org/10.1117/1.OE.56.3.036114

Received: 25 November 2016; Accepted: 22 February 2017; Published: 25 March 2017

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