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Author Kissinger, Thomas ♦ Charrett, Thomas O. H. ♦ James, Stephen W. ♦ Tatam, Ralph P. ♦ Adams, Alvin ♦ Twin, Andrew
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ BEAMS ♦ CRYOSTATS ♦ CURRENTS ♦ DATA ♦ DISTANCE ♦ FIBERS ♦ FREQUENCY MODULATION ♦ LASER RADIATION ♦ MECHANICAL VIBRATIONS ♦ NOISE ♦ RESONANCE ♦ SAMPLE HOLDERS ♦ SIGNALS ♦ SURFACES
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{sup −05}. 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 target inside. This allows the separation of common-mode vibrations of the whole cryostat from differential vibrations between the window and the target, allowing any resonances to be identified.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-06-28
Publisher Place United States
Volume Number 1740
Issue Number 1


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