| 摘要 |
1. Capacitive displacement-frequency-transducer, particularly pressure-frequency transducer with at least one metallic membrane (10, 11) exposed to the pressure to be measured and the position of which varies in relation to a counter-electrode (6) in dependence of the measured quantity, the membrane (11) being arranged in a line resonator (27) as a frequency determining element and means (18) being provided for feeding high frequency electromagnetic energy of adjustable frequency to the line resonator (27) and the line resonator being coupled to a detecting circuit (25, 26, 28, 29, 20, 21) for tuning the frequency of the high frequency energy to the resonance frequency of the line resonator (27), thereby characterized, that the metallic membrane (11) is part of a barometric cell (10, 11) and that the line resonator (27) is composed of two concentric circular cylinders (1, 3) with a common base plate (2) and of different lenghts, the barometric cell (10, 11) being secured to the upper face (4) of the shorter inner cylinder (3) with a clearance to the cover plate (6) and to the inner surface of the longer outer cylinder (1) such, that an electrically conductive connection exists between the metallic membrane (11) and the metallic conductive common surface consisting of the outer surface of the inner cylinder (3), the inner surface of the outer cylinder (1) and the base and cover plates (2, 6) connecting said surfaces of the cylinders. |
