| 摘要 |
<p>The angular velocity measuring device consists of an optical fibre (1) which defines a closed optical pathway along which light can travel in two opposing directions (2a,2b). The optical fibre is wound on a bobbin (4) such that one section (3) of it passes through correction devices. Light from a laser (8) is introduced into the fibre at a point (14) via a divider (9), two frequency adjusters (10a,10b), two mirrors (11a,11b) and a light guide (13). A small fraction of the light circulating in each direction is extracted at a second point (1b) where it is conducted by a light guide (15) to two photodetectors (17a,17b) and transmitted to a processing calculator (19). Correction devices modify the polarisation of the light circulating in the material of the optical fibre. An electro-optical correction device has two pairs of plane electrodes. The first pair (21,21') create an electric field perpendicular to the axis of the optical fibre (3), and the second pair (22,22') create an electric field perpendicular to the first. A HV generator (23) establishes between the first pair of electrodes the potential difference generating the electric field. Similarly the second pair of electrodes are connected to a second HV generator (24). A magneto-optical correction device has a solenoid (25) carrying the electric current produced by an adjustable intensity generator (26). It produces a magnetic field along the axis of the optical fibre (3) producing a non-symmetric rotational effect on the polarisation.</p> |
