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

Ke Wang; Haijin Fu; Di Chang; Pengcheng Hu; Hongxing Yang; Ruitao Yang; Jiubin Tan

doi:10.1117/12.2512441

7 March 2019 An enhanced homodyne laser vibrometer based on an auto-gain module

Ke Wang, Haijin Fu, Di Chang, Pengcheng Hu, Hongxing Yang, Ruitao Yang, Jiubin Tan

Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 1105346 (2019) https://doi.org/10.1117/12.2512441
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China

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%.

Citation Download Citation

Ke Wang, Haijin Fu, Di Chang, Pengcheng Hu, Hongxing Yang, Ruitao Yang, and Jiubin Tan "An enhanced homodyne laser vibrometer based on an auto-gain module", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 1105346 (7 March 2019); https://doi.org/10.1117/12.2512441

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