Patent ID: 6590500
Filing Date: 2003-07-08
Classification: G01D

Abstract:
A method of providing substantially linear electrical signal in response to an object moving relative to a stationary reference comprising(a) disposing a magnet for movement with the object; (b) disposing a stationary sensor to be proximate the moving object and electrically exciting the sensor with substantially constant direct current voltage; (c) generating a sine wave voltage signal and a cosine wave signal with the sensor as the object is moved with respect to the stationary reference; and (d) connecting a signal processing circuit to receive said sine wave and cosine wave signal and generating an output voltage signal voltage (N) in accordance with the following able of values of {circle around (âˆ’)} where K1 and K2 are respectively predetermined constants: &THgr;V0-&pgr;/4SIN2&THgr;âˆ’â€‚COS2&THgr; = K1&pgr;/4-&pgr;/2âˆ’SIN2&THgr;âˆ’ COS2&THgr; = K2.