Laser rotation rate sensor

Details Laser rotation rate sensor Laser rotation rate sensor

1982-12-27

1986-01-07

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350377, G01C 1964

Patent

active

045630925

ABSTRACT:
The invention relates to a laser rotation rate sensor wherein two light beams counterrotate in a polygon equipped with reflectors at its corners, a signal being derived from their frequency difference in dependence on the rate of rotation. The rotation rate sensor comprises a reflector designed and operated as a magneto-optic element for the suppression of lock-in and including a prism whose base boundary face is disposed adjacent a layer of a gyrotropic material, the reflector being designed in such a manner that total reflection occurs. In the laser rotation rate sensor, the index of refraction of the gyrotropic material is approximately equal to or greater than that of the prism; a further layer of a dielectric material is disposed adjacent the gyrotropic layer, which further layer has a smaller index of refraction than the prism material and the material of the gyrotropic layer, in such a manner that total reflection occurs at the interface between the layer of gyrotropic material and the further layer.

REFERENCES:
patent: 3545866 (1970-12-01), Jacobs et al.
patent: 3626394 (1971-12-01), Nelson et al.
patent: 3636535 (1972-01-01), Cushner et al.
patent: 3649931 (1972-03-01), Macek
patent: 3752586 (1973-08-01), Hutchings et al.
patent: 3851973 (1974-12-01), Macek
patent: 4195908 (1980-04-01), Kestigian et al.
patent: 4225239 (1980-09-01), Prinz

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