| 摘要 |
<p>GCD-75-19 Disclosed herein is a ring laser gyroscope which operates with four circularly polarized beams at four mutually distinct frequencies, with two oppositely circularly polarized beams propagating in one direction and the two other oppositely circularly polarized beams propagating in the opposite direction, A proportion of the light energy in each beam is converted into electrical energy and the frequencies present in the electrical output signal thus generated are used to determine the rate and the direction of rotation of the ring laser, This is implemented by an arrangement in which light energy at all four frequencies is applied simultaneously to a single photodiode having a non-linear characteristic, thereby to produce a combined electrical signal which contains sum and difference frequencies of all four frequencies, used in the determination of the rate and the direction of rotation of the ring laser.</p> |
