| 摘要 |
A probe for detecting structural faults in materials comprises a body (10) pivotally mounting therein a bell crank lever (38). The latter mounts at one end an external foot (48) for engaging with the material and at its other end presents an optical window (44,46) normally disposed in a gap between aligned ends within the body (10) of fibre optic cables (24,30). An infra-red beam is transmitted along the cables (24,30) and any slight movement of the foot (48) caused by a fault in the material will displace the optical window to interrupt the infra-red beam and thus give an indication of structural or component failure. Such a probe is isolated electrically and is free from sparking and fire hazards.
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