The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1992
Filed:
Dec. 05, 1990
Orville E Bean, Wayland, MA (US);
Daniel R Weber, Groton, MA (US);
Data Instruments, Inc., Acton, MA (US);
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.