Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1974-07-15
1976-05-11
McGraw, Vincent P.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356112, G02F 138
Patent
active
039558800
ABSTRACT:
An infrared radiation modulator comprising three parallely arranged interferometer plates, forming two successive slits or cavities therebetween for passing the infrared radiation to be modulated. The width of said slits is periodically varied by the oscillations of the central interferometer plate while the two outer plates remain stationary, a positive variation of the width of one of the slits corresponding at any time to a negative variation of the width of the other slit. A particularly suitable material for the interferometer plates is monocrystalline doped cadmium telluride having a high resistivity and a limited absorption rate for infrared radiation. A very precise alignment of the interferometer plates and an accurate adjustment of the width of the slits therebetween can be achieved by using a wedge-arrangement comprising three radially displaceable wedges disposed at angles of 120.degree. for adjusting the parallelism of the plates and the width of the slits formed between the central plate and the two outer plates when in their normal (rest) position, said adjustment being made independently for each slit. In a particular embodiment, the interferometer plates are made of a material having a high resistance and having marginal zones overlaid with metal layers forming in each slit three uniformly distributed capacitors. By varying the capacitance of said capacitors the width of the interferometric slits or the parallelism of the plates can be adjusted.
REFERENCES:
patent: 3659919 (1972-05-01), Williams
"Spectrometer for Laser Analysis" NBS Tech. News Bltn, Mar. 1964, pp. 46-47.
"Rapid Scanning of Spectral Line Profiles Using An Oscillating Fabry-Perot Interfeometer", by Copper, et al. Jrnl of Sci. Instruments, Vol. 40, No. 9, 9/63 pp. 433-437.
McGraw Vincent P.
Organisation Europeenne de Recherches Spatiales
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