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:
Jun. 29, 1976
Filed:
Aug. 14, 1975
William H Spencer, Monrovia, CA (US);
Bell & Howell Company, Chicago, IL (US);
Abstract
A temperature compensation circuit for sensors of physical variables, such as temperature and pressure, employs an effective constant current source that is sensitive to ambient temperature and which has an adjustable thermal slope and an adjustable output at discrete temperatures. The effective constant current source may be connected across the input terminals of a sensor such as a pressure transducer employing strain gages or it may be connected in series with the excitation current of such a transducer. Additionally, the effective constant current source may be connected in the output of a sensor such as a thermocouple that is responsive to temperature changes. When connected to the input of a sensor, the temperature compensation circuit controls the excitation current through the sensor as a function of the ambient temperature of the sensor and compensation circuit. When connected in the output of the sensor, the temperature compensation circuit provides a voltage that is a function of the ambient temperature, which voltage is added to the output of the sensor to compensate for voltage variations due to changes in ambient temperature.