| 摘要 |
A ring laser gyro assembly in which the length of closed loop path cavity 12 is maximised within a compact long narrow structure for use in a borehole has a body 10 of polygonal shape with two sides 30, 32 being substantially longer than the remaining sides 34, 36, 38, 40, each of the mirrors 20, 22, 24, 26 being disposed on a different one of the shorter sides. Lock-in is prevented by a mirror dither 45, 47, wherein two of the mirrors are vibrated 180 DEG out of phase, and a bias apparatus which includes two narrow flexure assemblies (50, 52) disposed adjacent the sides 30, 32 of the gyro body and piezoelectrically riven 180 DEG out of phase. Each flexure assembly comprises a pair of blades having an outer end secured to the gyro support means and an inner end coupled via mounting blocks to the gyro body. <IMAGE> |
