Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1998-05-08
1999-02-09
Kim, Robert
Optics: measuring and testing
By particle light scattering
With photocell detection
356352, G01B 0902
Patent
active
058701923
ABSTRACT:
A multi-beam Velocity Interferometer System for Any Reflector (VISAR) which can measure velocity histories at multiple locations simultaneously. A VISAR's interferometer accepts laser signal light which has been reflected from a specimen surface, and produces light fringes in proportion to the reflecting surface velocity by virtue of the Doppler shift in wavelength. The invention uses a reflected-light fiber optic bundle to supply the signal light for the VISAR. The bundle has multiple optical fibers, each carrying light reflected from a separate measurement location. The light emerging from the reflected-light fiber bundle is transformed into a beam by a collimator. The beam travels through the conventional VISAR interferometer, emerging usually in two or four exit beams. Imaging optics in the exit beams, together with the collimator, create real images of the end of the reflected-light fiber bundle. The light reflected from the different locations of measurement is not segregated while traversing the interferometer. However, in the exit beam images, the light from each individual reflected-light optical fiber is resegregated, and forms the separate images of the ends of the individual fibers. This allows the separated signals from each location of measurement to be recaptured and sent to assigned light detectors for sensing, recording, and later data reduction to velocities vs. time. The multi-beam VISAR preserves the high-quality optical fringes, accuracy, and ease-of-use features of many former VISARs, and is capable of economically measuring at least tens of locations simultaneously.
REFERENCES:
patent: 5202558 (1993-04-01), Barker
patent: 5481359 (1996-01-01), Barker
L. M. Barker, "Velocity Interferometry for Time-Resolved High Velocity," in Proc. SPIE 27th Annual International Technical Symposium and Instrument Display, San Diego, CA, Aug. 21-26, 1983.
L. M. Barker and R. E. Hollenback, "Laser Interferometer for Measuring High Velocities of Any Reflecting Surface," Journal of Applied Physics, vol. 43, pp. 4669-4675, Nov. 1972.
B. T. Amery, "Wide Range Velocity Interferometer," in Sixth Symposium on Detonation (Ofice of Naval Research, Dept. of the Navy, Arlington, VA, Aug. 24-27, 1976) pp. 673-681.
W. F. Hemsing, "Velocity Sensing Interferometer (VISAR) Modification," Review of Scientific Intstruments, vol. 50, pp. 73-78, 1979.
W. F. Hemsing, et. al., "VISAR: Line-Imaging Interferometer," in Shock Compression of Condensed Matter, pp. 768-770 (1992), copyright Elsevier Science Publishers B. V.
K. Baumung, et. al., "Hydrodynamic Proton Beam-Target Interaction Experiments Using an Improved Line-Imaging Velocimeter," in Shock Compression of Condensed Matter--1995, pp. 1015-1018 (1996), AIP Press, Woodbury, N.Y.
Kim Robert
Lee Andrew H.
LandOfFree
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