Multi-point laser coherent detection system and its application on vibration measurement
Laser Doppler vibrometry (LDV) is a well-known interferometric technique to measure the motions, vibrations and mode shapes of machine components and structures. The drawback of commercial LDV is that it can only offer a pointwise measurement. In order to build up a vibrometric image, a scanning dev...
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sg-ntu-dr.10356-902232020-09-26T22:15:01Z Multi-point laser coherent detection system and its application on vibration measurement Fu, Y. Yang, C. Xu, Y. J. Liu, H. Yan, K. Guo, M. Lehmann, Peter Osten, Wolfgang Albertazzi Gonçalves, Armando School of Mechanical and Aerospace Engineering Optical Measurement Systems for Industrial Inspection IX Temasek Laboratories Multi-point Laser Doppler Vibrometer Spatial-encoding DRNTU::Engineering::Mechanical engineering Laser Doppler vibrometry (LDV) is a well-known interferometric technique to measure the motions, vibrations and mode shapes of machine components and structures. The drawback of commercial LDV is that it can only offer a pointwise measurement. In order to build up a vibrometric image, a scanning device is normally adopted to scan the laser point in two spatial axes. These scanning laser Doppler vibrometers (SLDV) assume that the measurement conditions remain invariant while multiple and identical, sequential measurements are performed. This assumption makes SLDVs impractical to do measurement on transient events. In this paper, we introduce a new multiple-point laser coherent detection system based on spatial-encoding technology and fiber configuration. A simultaneous vibration measurement on multiple points is realized using a single photodetector. A prototype16-point laser coherent detection system is built and it is applied to measure the vibration of various objects, such as body of a car or a motorcycle when engine is on and under shock tests. The results show the prospect of multi-point laser coherent detection system in the area of nondestructive test and precise dynamic measurement. Published version 2018-12-27T03:59:34Z 2019-12-06T17:43:27Z 2018-12-27T03:59:34Z 2019-12-06T17:43:27Z 2015 Conference Paper Fu, Y., Yang, C., Xu, Y. J., Liu, H., Yan, K., & Guo, M. (2015). Multi-point laser coherent detection system and its application on vibration measurement. Optical Measurement Systems for Industrial Inspection IX, 9525, 952521-. doi:10.1117/12.2185264 https://hdl.handle.net/10356/90223 http://hdl.handle.net/10220/47232 10.1117/12.2185264 en © 2015 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Optical Measurement Systems for Industrial Inspection IX and is made available as an electronic reprint (preprint) with permission of Society of Photo-optical Instrumentation Engineers (SPIE). The published version is available at: [http://dx.doi.org/10.1117/12.2185264]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 6 p. application/pdf |
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Multi-point Laser Doppler Vibrometer Spatial-encoding DRNTU::Engineering::Mechanical engineering Fu, Y. Yang, C. Xu, Y. J. Liu, H. Yan, K. Guo, M. Multi-point laser coherent detection system and its application on vibration measurement |
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Laser Doppler vibrometry (LDV) is a well-known interferometric technique to measure the motions, vibrations and mode shapes of machine components and structures. The drawback of commercial LDV is that it can only offer a pointwise measurement. In order to build up a vibrometric image, a scanning device is normally adopted to scan the laser point in two spatial axes. These scanning laser Doppler vibrometers (SLDV) assume that the measurement conditions remain invariant while multiple and identical, sequential measurements are performed. This assumption makes SLDVs impractical to do measurement on transient events. In this paper, we introduce a new multiple-point laser coherent detection system based on spatial-encoding technology and fiber configuration. A simultaneous vibration measurement on multiple points is realized using a single photodetector. A prototype16-point laser coherent detection system is built and it is applied to measure the vibration of various objects, such as body of a car or a motorcycle when engine is on and under shock tests. The results show the prospect of multi-point laser coherent detection system in the area of nondestructive test and precise dynamic measurement. |
author2 |
Lehmann, Peter |
author_facet |
Lehmann, Peter Fu, Y. Yang, C. Xu, Y. J. Liu, H. Yan, K. Guo, M. |
format |
Conference or Workshop Item |
author |
Fu, Y. Yang, C. Xu, Y. J. Liu, H. Yan, K. Guo, M. |
author_sort |
Fu, Y. |
title |
Multi-point laser coherent detection system and its application on vibration measurement |
title_short |
Multi-point laser coherent detection system and its application on vibration measurement |
title_full |
Multi-point laser coherent detection system and its application on vibration measurement |
title_fullStr |
Multi-point laser coherent detection system and its application on vibration measurement |
title_full_unstemmed |
Multi-point laser coherent detection system and its application on vibration measurement |
title_sort |
multi-point laser coherent detection system and its application on vibration measurement |
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2018 |
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https://hdl.handle.net/10356/90223 http://hdl.handle.net/10220/47232 |
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1681056139484069888 |