Simultaneous laser vibrometry on multiple surfaces with a single beam system using range-resolved interferometry

Date published

2015-06

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Publisher

SPIE

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Type

Conference paper

ISSN

0277-786X

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Citation

Kissinger, T., Charrett, T.O.H., James, S.W., Adams, A., Twin, A. and Tatam, R.P. 2015. Simultaneous laser vibrometry on multiple surfaces with a single beam system using range-resolved interferometry. Proceedings of the SPIE, 9525, Optical measurement systems for industrial inspection IX, paper number 952520. DOI: 10.1117/12.2183281

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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Software Description

Software Language

Github

Keywords

Interferometry, Vibrometry, Displacement sensing, Range-resolved interferometric signal processing, LDV, Multi-surface vibrometry, Cryogenics, Low temperature

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Funder/s

EPSRC