Research/Patents/US 5116132
US 5116132Tier 2 — Research Body

RING LASER GYROSCOPE OUTPUT OPTICS DETECTION SYSTEM

Assignee

Litton Systems

Filed as: LITTON SYSTEMS, INC., A CORP. OF DE

Filed

Jan 12, 1990

Granted

May 26, 1992

Location

WOODLAND HILLS CA US

Abstract

A ring laser gyroscope output optics detection system, including a rotational sensing system and cavity length control system for a multioscillator ring laser gyroscope, is disclosed herein that can operate with a simple upright symmetric optics mechanism, where the required signal separation is performed fully electronically. In a preferred embodiment, signal separation circuitry is provided which performs a 90° or π/2 radians phase shift to one of a set of heterodyned signals in order to extract the sagnac effect modulated Faraday frequency signals WA and WB. In order to deal with the inherent problems of crosstalk present in a Faraday biased system, alternative signal separation schemes suggest the use of a 45° or π/4 radians phase shift, as well as a 60° or π/3 radians phase shift. Complementary cavity length control schemes are presented in both fixed component and digitally controlled formats.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Apr 3, 1991

Rescinded

May 23, 1991

Duration

1 month

Inventor

  • 1ROBERT A. MITCHELL

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records