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An enhanced homodyne laser vibrometer based on an auto-gain module
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Paper Abstract

This study presents an enhanced homodyne laser vibrometer with adaptability to reflectivity. The reflectivity could be quite different when measuring different target, which caused the variation of the intensity of the interference signals. In order to enhance the measurement range for the reflectivity of the target, an auto-gain module, which could enlarge the interference signals to an optimal range of the analog-to-digital converter, is implemented in the signal-processing card. The intensity of the interference signals could be calculated in the auto-gain module, and then amplified according to a predetermined rule by using programmable gain amplifiers. The experimental results indicated that the laser vibrometer proposed is capable of measuring vibration with surface reflectivity down to 0.08%.

Paper Details

Date Published: 7 March 2019
PDF: 6 pages
Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 1105346 (7 March 2019); doi: 10.1117/12.2512441
Show Author Affiliations
Ke Wang, Harbin Institute of Technology (China)
Haijin Fu, Harbin Institute of Technology (China)
Di Chang, Harbin Institute of Technology (China)
Pengcheng Hu, Harbin Institute of Technology (China)
Hongxing Yang, Harbin Institute of Technology (China)
Ruitao Yang, Harbin Institute of Technology (China)
Jiubin Tan, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 11053:
Tenth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Jie Lin, Editor(s)

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