Patent ID: 8272246
Filing Date: 2012-09-25
Classification: G01B

Abstract:
1. A system for self-calibration of multiple channel clearance sensor system comprising: at least one sensor for measuring at least one clearance parameter signal between a stationary object and a rotating object; at least one offset correction section configured to determine an offset error in the clearance parameter signal; at least one level shifter coupled to said offset error and switchably coupled to said clearance parameter signal; at least one amplifier to amplify the level shifter output; at least one analog to digital converter (ADC) coupled to the amplifier output to provide a digital output; at least one signal level analyzer coupled to the digital output and configured to determine at least one channel gain signal based on a discrepancy voltage; and a reference signal switchably coupled to said level shifter providing a reference signal used to process the discrepancy voltage.