24 September 1998 Multichannel fiber optic laser vibrometer
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Abstract
A non-contact nine channel fiber optic laser vibrometer has been developed to measure the vibrations of low mass flexible space structures. The Multi-Channel Fiber optic VIBrometer (MCFVIB) system is based on a commercial single channel laser vibrometer and a fiber-optic distribution system. This entailed the development of appropriate systems architecture for the optical signals, active 1 X 9 optical switch, and optical sensor heads suitable for coupling the reflected test signal back into the fiber optic system. MCFVIB employs single-mode, polarization maintaining fibers to maintain the signal coherence. The performance of the MCFVIB was tested at various vibrational frequencies using a shaker. Correlation of the measurements against those measured by an accelerometer indicate excellent linearity and accuracy for the fiber optic vibrometer system.
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Rupak Changkakoti, Rupak Changkakoti, Roman V. Kruzelecky, Roman V. Kruzelecky, Asoke Kumar Ghosh, Asoke Kumar Ghosh, Wanping Zheng, Wanping Zheng, } "Multichannel fiber optic laser vibrometer", Proc. SPIE 3414, Opto-Contact: Workshop on Technology Transfers, Start-Up Opportunities,and Strategic Alliances, (24 September 1998); doi: 10.1117/12.323515; https://doi.org/10.1117/12.323515
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