Many-beam velocimeter for fast surfaces

David R. Goosman; George R. Avara; Lloyd L. Steinmetz; Ching C. Lai; Stephen J. Perry

doi:10.1117/12.273413

28 May 1997 Many-beam velocimeter for fast surfaces

David R. Goosman, George R. Avara, Lloyd L. Steinmetz, Ching C. Lai, Stephen J. Perry

Proceedings Volume 2869, 22nd International Congress on High-Speed Photography and Photonics; (1997) https://doi.org/10.1117/12.273413
Event: 22nd International Congress on High-Speed Photography and Photonics, 1996, Santa Fe, NM, United States

Abstract

For the past 5 years, we have conceived, built and successfully used a new 10 beam laser velocimeter for monitoring velocity vs time histories of fast moving surfaces, and will have a 20 beam capability soon. We conceived a method to multiplex 5 to 10 beams through a single Fabry-Perot interferometer, without losing any light that our equivalently-performing single beam system could use, and with negligible cross-talk. This saves the cost of 16 interferometers, simplifies operation and takes less space than without multiplexing. We devised special efficient light collecting probes, streak cameras that change sweep speed during the course of the record, and a new double cavity interferometer which is better, cheaper and more flexible than our previous versions. With the 10 recorders, we conceived and employ a method of using both a fast and a slow streak camera on each of 5 beams without reducing the light that is available to either camera separately. Five new galvanometrically-driven triggerable CCD streak cameras will be installed soon.

Citation Download Citation

David R. Goosman, George R. Avara, Lloyd L. Steinmetz, Ching C. Lai, and Stephen J. Perry "Many-beam velocimeter for fast surfaces", Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); https://doi.org/10.1117/12.273413

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