Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface
A new method for measuring in-plane vibration velocity of glossy and specular surface using differential laser Doppler vibrometer (LDV) is proposed in this work. A standard tangential LDV using similar differential configuration is only able to measure in-plane velocity of objects with rough surface...
| Main Authors: | , , , , , |
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| Format: | Conference Paper |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/88482 http://hdl.handle.net/10220/46933 |
| _version_ | 1811682022641369088 |
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| author | Agusanto, Kusuma Lau, Gih-Keong Wu, Kun Liu, Ting Zhu, Chuangui Yuan, Ling |
| author2 | Quan, Chenggen |
| author_facet | Quan, Chenggen Agusanto, Kusuma Lau, Gih-Keong Wu, Kun Liu, Ting Zhu, Chuangui Yuan, Ling |
| author_sort | Agusanto, Kusuma |
| collection | NTU |
| description | A new method for measuring in-plane vibration velocity of glossy and specular surface using differential laser Doppler vibrometer (LDV) is proposed in this work. A standard tangential LDV using similar differential configuration is only able to measure in-plane velocity of objects with rough surface, due to its inherent on-axis optical design that collects backscatter light along its optical axis. The proposed method adopts an off-axis detection scheme, in which the photodetector is decoupled from LDV, and placed along the dominant direction of the scattered light. For optimal placement, the bidirectional reflectance distribution function (BRDF) of the sample must be considered ideally, but in our measurement tests, the off-axis detection along the direction of specular reflection is sufficient to obtain good measurement results. Another advantage with this setup is that it also works with the objects with rough surface. Experimental works using the standard tangential LDV and a prototype of this method were conducted to measure the in-plane motion of four different samples representing rough, glossy and mirror-like surface. An electrodynamic shaker was used to provide the in-plane motion of the samples at three different frequencies. A single point axial vibrometer was used to validate the in-plane velocity of the measurement from both in-plane LDVs. Some preliminary results showed that the in-plane motion of the object with glossy and specular surface can be measured using the proposed method. |
| first_indexed | 2024-10-01T03:50:14Z |
| format | Conference Paper |
| id | ntu-10356/88482 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:50:14Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/884822023-03-04T17:07:18Z Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface Agusanto, Kusuma Lau, Gih-Keong Wu, Kun Liu, Ting Zhu, Chuangui Yuan, Ling Quan, Chenggen Qian, Kemao Asundi, Anand Chau, Fook Siong School of Mechanical and Aerospace Engineering Proceedings of SPIE - International Conference on Experimental Mechanics 2014 In-plane Motion Laser Doppler Vibrometry DRNTU::Engineering::Mechanical engineering A new method for measuring in-plane vibration velocity of glossy and specular surface using differential laser Doppler vibrometer (LDV) is proposed in this work. A standard tangential LDV using similar differential configuration is only able to measure in-plane velocity of objects with rough surface, due to its inherent on-axis optical design that collects backscatter light along its optical axis. The proposed method adopts an off-axis detection scheme, in which the photodetector is decoupled from LDV, and placed along the dominant direction of the scattered light. For optimal placement, the bidirectional reflectance distribution function (BRDF) of the sample must be considered ideally, but in our measurement tests, the off-axis detection along the direction of specular reflection is sufficient to obtain good measurement results. Another advantage with this setup is that it also works with the objects with rough surface. Experimental works using the standard tangential LDV and a prototype of this method were conducted to measure the in-plane motion of four different samples representing rough, glossy and mirror-like surface. An electrodynamic shaker was used to provide the in-plane motion of the samples at three different frequencies. A single point axial vibrometer was used to validate the in-plane velocity of the measurement from both in-plane LDVs. Some preliminary results showed that the in-plane motion of the object with glossy and specular surface can be measured using the proposed method. Published version 2018-12-12T09:00:10Z 2019-12-06T17:04:15Z 2018-12-12T09:00:10Z 2019-12-06T17:04:15Z 2015 Conference Paper Agusanto, K., Lau, G.-K., Wu, K., Liu, T., Zhu, C., & Yuan, L. (2015). Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface. Proceedings of SPIE - International Conference on Experimental Mechanics 2014, 9302, 93020V-. doi:10.1117/12.2075845 https://hdl.handle.net/10356/88482 http://hdl.handle.net/10220/46933 10.1117/12.2075845 en © 2015 Society of Photo-optical Instrumentation Engineers (SPIE). This paper was published in Proceedings of SPIE - International Conference on Experimental Mechanics 2014 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/10.1117/12.2075845]. 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 |
| spellingShingle | In-plane Motion Laser Doppler Vibrometry DRNTU::Engineering::Mechanical engineering Agusanto, Kusuma Lau, Gih-Keong Wu, Kun Liu, Ting Zhu, Chuangui Yuan, Ling Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface |
| title | Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface |
| title_full | Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface |
| title_fullStr | Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface |
| title_full_unstemmed | Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface |
| title_short | Directional-sensitive differential laser Doppler vibrometry for in-plane motion measurement of specular surface |
| title_sort | directional sensitive differential laser doppler vibrometry for in plane motion measurement of specular surface |
| topic | In-plane Motion Laser Doppler Vibrometry DRNTU::Engineering::Mechanical engineering |
| url | https://hdl.handle.net/10356/88482 http://hdl.handle.net/10220/46933 |
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