Temp. compensation for inductive and capacitive transducers for distance measurement - using control signal derived from input parameters to influence evaluation electronics and minimise temp. dependency

摘要

A transducer (A) with a complex impedance, capacitive or inductive, produces one or more output signals (S) from which an evaluation device (AE) produces an output signal (AS) corresp. to a measurement parameter. A control signal is produced from one of two input parameters, from their amplitude ratio or their phase relationship. The control signal influences the evaluation electronics to minimise the temp. dependency of the output signal. ADVANTAGE - Can work under rough operating conditions and over wide temp. range. No additional temp. sensitive component needed to be fixed to pick-up. Oscillator does not need to be re-adjusted.