Device for distance measurement

Details Device for distance measurement Device for distance measurement

G - Physics

08

C

340/135.7

G08C 21/00 (2006.01) G01B 7/02 (2006.01) G01D 3/036 (2006.01)

Patent

CA 1305765

(Translation) 01559-99 Device for distance measurement Abstract: Damping of a coil (L1) can be influenced by an object (1) such that the radio-frequency voltage at the coil (L1) depends on the distance (a) of the object (1) from the coil (L1). A constant direct current is superimposed on the radio-frequency current by the coil, whereby the d.c. voltage drop across the coil (L1) is influenced by temperature which affects the d.c. damping resistance of the coil (L1). The radio-frequency excitation (5, 6) of the coil (L1) is controlled by the d.c. voltage drop in order to compensate the influence of temperature on the radio- frequency voltage so that the radio-frequency voltage depends only on the distance (a). The radio-frequency voltage, which is non- linearly related to the distance (a), is linearized in relation to the distance (a) in a non-linear member (15) with a semi-conductor element. The influence of temperature on the linearization is thereby compensated by means of a second semi-conductor element.

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