Rotational motion transducer

Details Rotational motion transducer Rotational motion transducer

1976-03-22

1977-08-02

McGraw, Vincent P.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

H01S 310

Patent

active

040392600

ABSTRACT:
A fiber optical waveguide of the glass or single crystal types is formed into a loop or spiral with its ends joined to maximize optical or infrared single mode transmission. The waveguide is modified by doping or some other technique to lase when the loop or spiral is radiated with sufficient electromagnetic or optical energy. A single or multiturn ring laser is thus formed. The ring or spiral may be essentially in one plane. The frequency of lasing or oscillating is a factor of waveguide length. Two lasing frequency pickoffs spaced a maximum distance apart on the waveguide each extract a small portion of the energy from the waveguide propagating in both the clockwise (CW) and counterclockwise (CCW) directions. The lasing frequency in the CW and CCW directions is a factor of the rotation rate of the transducer, decreasing in the direction of rotation and increasing in the direction opposite to rotation. The CW and CWW radiation frequencies are heterodyned to give low frequencies proportional to rotation rate, and phase relationships which are proportional to rotational rate and number of turns of the waveguide.

REFERENCES:
patent: 3320850 (1967-05-01), Oliver
patent: 3743962 (1973-07-01), Rosenberg
patent: 3890047 (1975-06-01), Warner

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