Spatially encoded multibeam laser Doppler vibrometry using a single photodetector
A laser Doppler vibrometer with single photodetector is introduced to measure the vibration on multiple...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/91973 http://hdl.handle.net/10220/6463 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A laser Doppler vibrometer with single photodetector is introduced to measure the vibration on multiple
points of target simultaneously. A 2 5 beam array with various frequency shifts is generated by three
acousto-optic devices, illuminating different points on a vibrating object. The reflected beams interfere with
a reference beam on a high-speed photodetector, and the signal is amplified and digitized with a rate of
500 megasamples/s. To extract vibration information of different points, the carrier frequencies of each
beam are elaborately designed so that they can be separated from cross-talk regions in the spectrum. The
experimental results are compared with that from a commercial single-point vibrometer, and the comparison
shows that it is possible to do a precise measurement on multiple points simultaneously using a single
photodetector. |
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