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Proceedings Paper

Optical fiber LDA offering high resolution and relatively long working distance
Author(s): D. I. Robinson; J. T. Turner
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Paper Abstract

A differential LDA system is described, which employs twin front lens transmitting optics and provides a very small probe volume of 9 microns diameter combined with relatively large working distance of 135 mm. The system incorporates optical fibers and frequency shifting using either a Bragg cell or rotating diffraction grating. The advantages of the twin front lens approach for systems with a high ratio of working distance to size of probe volume are discussed and the positional tolerances required when using a rotating diffraction grating in conjunction with single mode fibers are analyzed. Finally, some experimental data are presented to confirm the optical properties and performance of the system.

Paper Details

Date Published: 6 August 1993
PDF: 8 pages
Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); doi: 10.1117/12.150528
Show Author Affiliations
D. I. Robinson, Univ. of Manchester (United Kingdom)
J. T. Turner, Univ. of Manchester (United Kingdom)


Published in SPIE Proceedings Vol. 2052:
Fifth International Conference on Laser Anemometry: Advances and Applications

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