Optical fiber LDA offering high resolution and relatively long working distance

D. I. Robinson; J. T. Turner

doi:10.1117/12.150528

6 August 1993 Optical fiber LDA offering high resolution and relatively long working distance

D. I. Robinson, J. T. Turner

Proceedings Volume 2052, Fifth International Conference on Laser Anemometry: Advances and Applications; (1993) https://doi.org/10.1117/12.150528
Event: Laser Anemometry: Advances and Applications: Fifth International Conference, 1993, Koningshof, Veldhoven, Netherlands

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.

Citation Download Citation

D. I. Robinson and J. T. Turner "Optical fiber LDA offering high resolution and relatively long working distance", Proc. SPIE 2052, Fifth International Conference on Laser Anemometry: Advances and Applications, (6 August 1993); https://doi.org/10.1117/12.150528

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