| 摘要 |
In the rotation rate measuring instrument, a light beam produced by a laser (1) is divided in a beam splitter (4) into two component beams (ICW, ICCW) which travel in opposite directions around an optical waveguard (9) forming a closed light path. A Bragg cell (6, 7) is inserted between the beam splitter and each end of the optical waveguide. One of the Bragg cells (6) is driven with a signal (fVCO) whose frequency is varied in accordance with the rotation rate. For the other Bragg cell, a switch (33) switches periodically between two drive signals (fMH, fML), so that the component beam is frequency-modulated (fS). A regulating facility (12, 13, 54, 55, 56) is provided which compensates for intensity differences between the two component beams. In further embodiments, it is possible to compensate for those intensity variations of the component beam (ICW) which are caused by driving the Bragg cell (5) at different frequencies (fMH, fML). It is also possible to design the instrument so that both the intensity differences between the two component beams and the intensity variations within one component beam can be compensated for. |
