| 摘要 |
A transducer which uses a thin silicon strip 1 as its responsive element has a piezo-resistor strain gauge 2 embedded in the silicon near its mounted end. To adjust the resonance characteristics in a desired manner the free end of the silicon element has a small magnet 3, with another magnet 4 in repelling relation therewith. It is also possible to have two magnets, one on each side of the element's free end (Fig. 3, not shown). In a disc-like transducer (Figs. 5 to 7, not shown), a set of piezo-resistors are located around the disc, with a small magnet at its centre, with one or two magnets adjacent thereto, in the same way as for the strip-like element. In all cases the magnets near to the silicon can be replaced by electromagnets (Figs. 8, 9, not shown). The transducer may function as an accelerometer to detect lack of lubrication in bearings, and a scanning accelerometer may be provided by supplying the electromagnets with scanning currents. In its disc-like form the transducer may function as a microphone or a scanning microphone for use in determining engine characteristics and/or faults. <IMAGE> |
