| 摘要 |
A single fluid-pressure transducer unit, of the type in which sensed electrical capacitance is varied in accordance with electrode deflections induced by pressure changes, is rendered capable of characterizing a wide range of pressures extending from near-vacuum to atmospheric levels, with the aid of a distinctive composite-electrode capsule (19A, 19C, 18) which interacts uniquely with a conventional type of sheet-metal diaphragm (9). While sensing relatively low pressures, the exhibited capacitance of the transducer is essentially that appearing between the diaphragm (9) and a nearby electrode (19C) carried by the capsule, but, at or near atmospheric pressure, the diaphragm (9) physically engages and deflects that electrode (19C), which is elastically deformable, causing it to vary a further capacitance appearing between that deformable electrode (19A) and a companion stationary electrode (18) which is also part of the capsule. |
