Simultaneous interferometric transmission of periodic spectral c

Details Simultaneous interferometric transmission of periodic spectral c Simultaneous interferometric transmission of periodic spectral c

1975-06-06

1977-02-01

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356 75, G01J 344, G01B 902

Patent

active

040059375

ABSTRACT:
Light having spectral components periodic in frequency is collected, collimated and transmitted by a light conditioning means. Secondary interferometric means, adapted to receive the light, selectively separate preselected spectra therefrom and send the light devoid of the separated spectra to a primary interferometric means. The primary interferometric means selectively separates periodic spectra from the light and transmits such spectra in the form of a fringe which provides a detectable signal. A multipass means directs the signal back through the primary interferometric means, whereby the contrast ratio of the signal is increased. A modulating means modulates the phase difference between interfering rays of light transmitted by the primary interferometric means so as to vary the intensity of the fringe. The intensity variation of the fringe is detected by a phase sensitive detection means, and the resultant signal is displayed by an indicating and recording means. Advantageously, each of the spectral lines is transmitted simultaneously. Thus, the detected signal is derived from a plurality of spectral lines and has an intensity substantially equal to their sum.

REFERENCES:
patent: 3853404 (1974-12-01), Barrett

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