22 June 2015 Simultaneous laser vibrometry on multiple surfaces with a single beam system using range-resolved interferometry
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Abstract
A novel range-resolved interferometric signal processing technique that uses sinusoidal optical frequency modulation is applied to multi-surface vibrometry, demonstrating simultaneous optical measurements of vibrations on two surfaces using a single, collimated laser beam, with a minimum permissible distance of 3.5 cm between surfaces. The current system, using a cost-effective laser diode and a fibre-coupled, downlead insensitive setup, allows an interferometric fringe rate of up to 180 kHz to be resolved with typical displacement noise levels of 8 pm Hz-0.5. In this paper, the system is applied to vibrometry measurements of a table-top cryostat, with concurrent measurements of the optical widow and the sample holder inside. This allows the separation of common-mode vibrations of the whole cryostat from differential vibrations between the window and the sample holder.
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Thomas Kissinger, Thomas Kissinger, Thomas O. H. Charrett, Thomas O. H. Charrett, Stephen W. James, Stephen W. James, Alvin Adams, Alvin Adams, Andrew Twin, Andrew Twin, Ralph P. Tatam, Ralph P. Tatam, } "Simultaneous laser vibrometry on multiple surfaces with a single beam system using range-resolved interferometry", Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 952520 (22 June 2015); doi: 10.1117/12.2183281; https://doi.org/10.1117/12.2183281
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