Open AccessOptical heterodyne micro-vibration measurement based on all-fiber acousto-optic frequency shifter
Author(s) -
Wending Zhang,
Gao Wei,
Ligang Huang,
Dong Mao,
Biqiang Jiang,
Feng Gao,
Di Yang,
Guoquan Zhang,
Jingyi Xu,
Jianlin Zhao
Publication year - 2015
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.017576
Subject(s) - optics , heterodyne (poetry) , vibration , optical fiber , waveform , heterodyne detection , materials science , signal (programming language) , physics , acoustics , voltage , laser , computer science , quantum mechanics , programming language
An all-fiber optical heterodyne detection configuration was proposed based on an all-fiber acousto-optic structure, which acted as both frequency shifter and coupler at the same time. The vibration waveform within a frequency range between 1 Hz to 200 kHz of a piezoelectric mirror was measured using this optical heterodyne detection system. The minimal measurable vibration amplitude and resolution are around 6 pm and 1 pm in the region of tens to hundreds of kilohertz, respectively. The configuration has advantages of compact size, high accuracy and non-contact measurement. Moreover, it is of a dynamically adjustable signal-to-noise ratio to adapt different surface with different reflections in the measurement, which will improve the usage efficiency of the light power.