DISPLACEMENT DETECTOR, ESPECIALLY DISPLACEMENT TO FREQUENCY TRANSDUCER FOR MEASURING PRESSURE

摘要

In a displacement detector, especially a displacement to frequency transducer for measuring pressure, comprising an oscillator (30) with a resilient vibrating reed (15) and signal processing means, the oscillator (30) including inductance members (20, 20') remaining in magnetic coupling, the resilient vibrating reed (15) comprises at least a first and a second leg (5, 5') connected by a coupling member (12) made of a ferromagnetic material, the first leg (5) being free for a displacement ( DELTA x) according to a pressure or other force causing this displacement ( DELTA x), the second leg (5') being fixed, the oscillator (30) including a first inductance member (20) determining a spacing (3) for receiving the coupling member (12), a second inductance member (20') for following the changes of the magnetic coupling between the coupling member (12) and the first inductance member (20), wherein the first and second inductance members (20, 20') are connected to means, especially an operational amplifier (IC1) for generating signals, particularly square wave signals of frequency corresponding to the displacement ( DELTA x).