Showing papers on "Ring laser gyroscope published in 1969"
Patent•
12 Nov 1969TL;DR: In this article, a servo control is provided to maintain the modulation index of the frequency modulation to an optimum value for minimal frequency-locking between the two counter-rotating beams, the difference frequency between the beams being indicative of the rotational rate to which the instrument is subjected.
Abstract: A ring laser gyro has a pair of counter-rotating beams, the difference frequency between the beams being indicative of the rotational rate to which the instrument is subjected. The beams are frequency modulated to minimize frequency-locking therebetween. A servo control is provided to maintain the modulation index of the frequency modulation to an optimum value for minimal frequency-locking between the beams.
19 citations
Patent•
04 Aug 1969TL;DR: A ring laser gyroscope utilizes a pair of oppositely rotating beams which are given a difference frequency in accordance with the rotation rate of their optical paths, the modulation indices of these frequency modulation signals being chosen to minimize the effects of frequency locking at low rotation rates as mentioned in this paper.
Abstract: A ring laser gyroscope utilizes a pair of oppositely rotating beams which are given a difference frequency in accordance with the rotation rate of their optical paths. A plurality of frequency modulated bias signals are imposed upon the beams, the modulation indices of these frequency modulation signals being chosen to minimize the effects of frequency locking at low rotation rates.
11 citations
Patent•
14 May 1969TL;DR: In this article, the output of a laser gyroscope operated with a large amplitude oscillatory bias was obtained after an integer number of bias cycles, and the output was then used to calculate the number of cycles needed to obtain the desired output.
Abstract: Electronic apparatus processes the output of a laser gyroscope which is operated with a large amplitude oscillatory bias, to obtain the output after an integer number of bias cycles.
11 citations
Patent•
25 Feb 1969TL;DR: In this article, the polarization anisotropy is utilized together with directional anisotropic so as to form a differential laser gyro system having two laser gyros operating in the same cavity with cavity modes of different frequencies in the form of mutually perpendicular plane polarization in each of the clockwise and counterclockwise directions.
Abstract: The polarization anisotropy which is utilized together with directional anisotropy so as to form a differential laser gyro system having two laser gyros operating in the same cavity with cavity modes of different frequencies in the form of mutually perpendicular plane polarization in each of the clockwise and counterclockwise directions, is achieved by providing a cavity having an odd number of dielectric mirrors and a total path length adjusted so that the phase reversal of one plane polarized wave (eg, vertical) results in a frequency difference between it and the other (eg, horizontal) polarized wave. The directional anisotropy may suitably be provided by a Faraday cell disposed in the optical path between quarter wave plates.
6 citations
Patent•
14 Apr 19692 citations