Double rotation inertial measurement apparatus

Optics: measuring and testing – Refraction testing – Prism engaging specimen

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G01B 902

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active

040171876

ABSTRACT:
Apparatus for sensing movement with respect to mutually orthogonal axes includes a plurality of ring laser motion sensors, mounted so as to lie as if in planes which would define contiguous mutually perpendicular surfaces such as are found at a corner of a cube, wherein the cube is rotated constantly about a diagonal axis thereof. The rotation imparts equal components of rotation to each of the ring laser motion sensors, thereby eliminating the effects of mode locking and assuring that the beat frequencies obtained by heterodyning signals related to the contra-rotating light waves of each motion sensor are linearly related, over the operating range of the inertial device, to the components of rotational rate measured parallel to the input axes of the respective ring laser motion sensors. The rotating sensor system is supported along its spin axis in an inner gimbal member for rotation, in turn, about an outer or vertical axis perpendicular thereto. The effects of fixed or slowly changing bias errors are substantially cancelled in the system, any remaining drift about inertial or earth's coordinate axes being substantially minimized by periodic reversal of the sense of rotation about the outer axis.

REFERENCES:
patent: 3563662 (1971-02-01), Wing

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