Method of and apparatus for double-exposure holographic interfer

Details Method of and apparatus for double-exposure holographic interfer Method of and apparatus for double-exposure holographic interfer

1981-06-17

1984-01-31

Sikes, William L.

Optics: measuring and testing

By particle light scattering

With photocell detection

G01B 9025

Patent

active

044286759

ABSTRACT:
Double-exposure holographic interferometry is carried out using first and second lasers (11), (12) responsive to respective applied firing signals for producing respective pulsed output beams. An optical system is provided oriented such that the output beams of the lasers produce coinciding scene (20) and reference (21) beams. An initiator circuit (30) generates and applies a firing signal to the first laser (11); and a timer/firing device (31), responsive to the generation of a firing signal by the initiator circuit (30), generates and applies a firing signal to the second laser (12) a predetermined period of time later.

REFERENCES:
patent: 3603684 (1971-09-01), Wuerker
patent: 3934461 (1976-01-01), Heflinger et al.
patent: 3970390 (1976-07-01), Heflinger et al.
Fagot et al., "Controls of Aeronautical Structures . . . ", Proc. SPIE vol. 210, pp. 154-158, 1979.
Armstrong et al., "Double-Pulsed Time Differential Holographic Interferometry", Applied Optics, vol. 16, No. 1, pp. 229-232.

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