Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-08-23
1996-01-02
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356345, 356 285, G01B 902
Patent
active
054813590
ABSTRACT:
A multi-etalon VISAR interferometer with variable velocity-per-fringe constant, capable of measuring the velocity of a diffusely-reflecting surface, having design innovations which preserve the fringe alignment of the interferometer even when its velocity-per-fringe constant is changed or when it is exposed to environmental stress such as substantial temperature changes or being moved from one location to another. The interferometer stability is enhanced by using a very stiff interferometer frame, to which the alignment-sensitive components of the interferometer are attached. The movable interferometer components are attached to a relatively long slide bar which can be attached to the interferometer frame at various locations in a slide bar track in the interferometer frame. Delay leg spacers allow the slide bar, with its movable interferometer components, to be positioned easily and accurately when changing the velocity-per-fringe constant.
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L. M. Barker, "Velocity Interferometry for Time-Resolved High-Velocity Measurements, " in Proceedings of SPIE 27th Annual International Technical Symposium and Instrument Display, San Diego, Calif., Aug. 21-26, 1983.
L. M. Barker and R. E. Hollenbach, "Laser Interferometer for Measuring High Velocities of Any Reflecting Surface," Journal of Applied Physics, vol. 43, No. 11, pp. 4669-4675, Nov., 1972.
B. T. Amery, "Wide Range Velocity Interferometer," in Sixth Symposium on Detonation (Office of Naval Research, Dept. of the Navy, Arlington, Va., Aug. 24-27, 1976), pp. 673-681.
Willard F. Hemsing, "Velocity sensing Interferometer (VISAR) Modification," Review of Scientific Instruments, vol. 50, No. 1, pp. 73-78, 1979.
Kim Robert
McGraw Vincent P.
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