Detection of movement of a cyclic interference waveform, such as

Details Detection of movement of a cyclic interference waveform, such as Detection of movement of a cyclic interference waveform, such as

1983-08-26

1986-06-17

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01C 1964

Patent

active

045952930

ABSTRACT:
Detection means comprise at least three photodiodes 1, 2 and 3 which are spaced so as to expand to half a wavelength of an interference waveform produced in a ring laser gyroscope. The three photodiodes 1, 2 and 3 produce respective currents A, B and C the magnitudes of which are detected to sense the magnitude and direction of the movement of the interference waveform. The currents A, B and C are fed to a current mirror configured as a Norton amplifier input state 4, the latter producing signals which are fed to logic circuitry for obtaining signals representative of the rate and direction of the movement of the interference waveform.

REFERENCES:
patent: 3627425 (1971-12-01), Doyle et al.
patent: 3721497 (1973-03-01), Shutt et al.
patent: 3854819 (1974-12-01), Andringa
patent: 4152072 (1979-05-01), Hutchings
patent: 4219276 (1980-08-01), Dorsman
patent: 4222667 (1980-09-01), Layne
patent: 4432646 (1984-02-01), Rodloff et al.

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