Interference signal processing for dynamic displacement measurement with 1 ns time resolution. (14th December 2017)

• Record Type: Journal Article
• Authors: Furukawa, Osamu; Tanaka, Yosuke
• Is Part Of: Applied physics express. Volume 11:Number 1(2018)
• Publication Date: 2017-12-14
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.11.012501
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We propose a novel signal processing method for a laser-interferometer-based displacement measurement system with significantly improved time resolution that enables us to measure transient state vibration with an instantaneous frequency of 100 MHz. In this method, a reference light is modulated by a sinusoidal waveform, and dynamic displacement is derived from the envelope curves of the interference signal. Using a phase modulator to emulate dynamic displacement with an instantaneous frequency of 100 MHz and a maximum peak-to-peak amplitude of over 100 nm, we confirmed that the proposed method can be used to measure fast dynamic displacement with 1 ns time resolution within 2.6 nm standard deviation.