| 摘要 |
A monitoring apparatus for monitoring impending faults in the integrity of a component or structure (10) in static or dynamic application where the apparatus comprises a sealed cavity (11) on or within the component or structure connected to a source of constant vacuum (17), the connection between the cavity (11) and the source (17) incorporating a device of high impedance fluid flow (15), and means (18) to monitor the change in pressure between the cavity (11) and the source (17).
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