| 摘要 |
<p>A condition indicator system for a wearable element (2, 3 or 53, 54) comprising an optical fibre (11 or 59, 60) attached to or within a wearable element, means (20, 21 or 55, 62, 65) connected to one end (17 or 46) of the optical fibre to transmit a light signal therethrough, means (18, 19 or 66, 63, 56) connected to the other end (22 or 47) of the optical fibre to detect the transmitted light signal, wherein the detector means (36) are arranged to produce an output signal contingent upon the transmitted light signal and warning means (38, 39) connected to the outputs of the detector means are arranged to generate a failure signal when the detector means output signal changes; the wearable element may be a carbon electrical traction current collector or a brush for a dynamo-electric machine and the optical fibre may be attached to the wearable element in such manner that breakage of the wearable element would break the optical fibre and/or the optical fibre may be fixed to a given wear point for the wearable element such that wear of the element to the wear point will break the optical fibre.</p> |
