Patent ID: 6374191
Filing Date: 2002-04-16
Classification: G01L

Abstract:
A self-calibrating sensor comprising:a sensor element for electrically detecting a change in physical amount of a workpiece; a signal output means for detecting the change of the sensor element and outputting an electric signal; a processor for conducting calibration calculation of the electric signal to adjust to the physical amount of the workpiece; wherein the processor includes a calibration value calculating circuit for calculating a calibration value by conducting the calibration calculation from the electric signal output by the signal output means when a known calibrating physical amount is applied to the sensor element, a calibration arithmetic circuit for obtaining a converted value of the physical amount by conducting calibration calculation based on the electric signal detected against an unknown measured physical amount by using the calibration value calculated by the calibration value calculating circuit, and a calibration completion determining circuit for determining whether the calculation of the calibration value by the calibration value calculating circuit is completed; and a memory for storing the calibration value from the processor, wherein a flag signal indicating completion of calculation of the calibration value is stored in the memory along with the calibration value, and wherein the calibration completion determining circuit detects the flag signal for determining whether the calculation of the calibration value is completed or not.