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Abstract

A transducer system is provided including an inductive linear displacement transducer connected to a temperature-compensating signal processor. The signal processor includes (a) an amplitude-variable, frequency-stable device providing a modulated D.C. current through the transducer, (b) a temperature-sensitive element connected in series between the transducer and the current-providing device such that it is subjected to substantially the same temperature as the transducer, and (c) a signal processing circuit coupled to the temperature-sensitive element. The temperature-sensitive element has a high temperature coefficient so that temperature changes have a substantial effect on the DC offset of the signal coming from the temperature-sensitive element, and a low dynamic resistance so that temperature changes have substantially no effect on the amplitude of the signal coming from the temperature-sensitive element. The signal processing circuit (1) detects changes in the DC offset of the signal coming from the temperature-sensitive element and generates a signal used as the input to the current-providing device to adjust the amplitude of the modulation of the current in compensation for changes in the amplitude of the signal coming from the transducer due to temperature changes; and (2) monitors the amplitude component of the signal coming from the temperature-sensitive element and provides an output signal reflective of the linear displacement of an object connected to the transducer.

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