Transducer linearizing system
AssigneeEaton Corporation
InventorsAllan R. Gale, Lyle O. Hoppie
Life of this patent
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Abstract
A system (20) for linearizing a non-linear transducer output signal (s.sub.2) which may be amplified to a non-linear output signal (s.sub.2) by suitable amplifier means (2) by providing signal (s.sub.2) to both a summing or linearization means (6) and an analog to digital converter which provides a signal (s.sub.3) to a storage means (4) which selectively provides a predetermined correction signal (s.sub.4) which is received by a digital to analog converter (5) to provide a signal (s.sub.5) to linearization means (6) for combination with signal (s.sub.2) to provide a linearized output signal (s.sub.6).
Claims11
A system for linearizing a non-linear transducer electrical voltage output signal profile depicting changes in a variable being monitored by the transducer over a prescribed range, said system comprising storage means, said means adapted to retrievably store a set of correction quantities selectively predetermined to linearize said non-linear signal upon combination therewith and operative to receive said non-linear signal over said range and selectively provide an electrical correction output signal corresponding thereto, and linearization means, said means operative to receive and combine said non-linear signal and said correction signal and provide a linearized electrical signal therefrom over said range.
Within an apparatus employing a single memory device, a method of effecting a high resolution linearization of an analog input voltage signal having a characteristic profile over a predetermined voltage range, said profile varying from an idealized profile by an error component, said error component equaling the arithmetic difference between the input and idealized profiles at finite points within said range, said method comprising:
- digitizing said input signal;
- addressing predetermined correction quantity data within said single memory device with said digitized input signal, said data comprising a finite number of constants, each constant correlating with an error component;
- outputting said addressed constant as a digital error signal;
- arithmetically adding said digital error signal with said digitized input voltage signal in a summing junction;
- outputting the resultant sum of said digital error an digitized input voltage signals;
- converting said resultant sum as an equivalent analog signal;
- and
- outputting said equivalent analog signal as an approximation of said idealized profile.
Dependencies are inferred from the claim text.