A measurement transducer consists of a stationary part (1) and a part (2) which moves parallel to and close to its surface. The opposing surfaces of the parts have capacitive coatings. The stationary part (1) forms a scale and consists of two rows of T-shaped interlocking combs. of capacitor surfaces (5,6). The capacitor surfaces (7-9) on the movable part act partly as transmitter electrodes and partly as receiver electrodes. The transmitter electrodes (7) are supplied with an a.c. voltage resulting in a rotating electric field which produces a.c. voltages at the receiver electrodes (8,9). The phase difference between the transmitter and receiver signal is proportional to the displacement between the stationary and moving parts.
