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A ring laser gyroscope (RLG) consists of a ring laser having two independent counter-propagating resonant modes over the same path; the difference in phase is used to detect rotation. It operates on the principle of the Sagnac effect which shifts the nulls of the internal standing wave pattern in response to angular rotation.
Ring Laser. Ring lasers are composed of two beams of light of the same polarization traveling in opposite directions ("counter-rotating") in a closed loop. Ring lasers are used most frequently as gyroscopes (ring laser gyroscope) in moving vessels like cars, ships, planes, and missiles. The world's largest ring lasers can detect details of the ...
Ring laser interferometers are self-calibrating. The beat frequency will be zero if and only if the ring laser setup is non-rotating with respect to inertial space. Fig. 8 illustrates the physical property that makes the ring laser interferometer self-calibrating. The grey dots represent molecules in the laser cavity that act as resonators.
A ring laser gyro can be a component of an ADIRU, but it is not in and of itself an ADIRU. That is like saying a transmission is often referred to as a car. —Preceding unsigned comment added by 166.70.56.136 ( talk ) 17:43, 4 June 2009 (UTC) [ reply ]
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Illustration of a Semiconductor Ring Laser (SRL). The laser cavity is a waveguide with a racetrack geometry (but this can also be another geometry), which enables it to lase in two counterpropagating directions: clockwise (CW) and counterclockwise (CCW). The light is evanescently coupled out of the cavity to a straight output waveguide.
When the Boeing 757-200 entered service in 1983, it was equipped with the first suitable ring laser gyroscope. This gyroscope took many years to develop, and the experimental models went through many changes before it was deemed ready for production by the engineers and managers of Honeywell and Boeing. It was an outcome of the competition with ...
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