Patent ID: 7722310
Filing Date: 2010-05-25
Classification: G01B

Abstract:
1. A system for measuring clearance between a first object and a second object, comprising: a sensor configuration to generate a first signal representative of a first sensed parameter and a second signal representative of a second sensed parameter; and a clearance measurement unit configured to process the first and second signals based upon a ratiometric technique to calculate clearance between the first and second objects; wherein the ratiometric technique is based on an equation: wherein S is the clearance between the first and second objects, K is a constant term that is a function of geometry of first and second sensors, C1, max is a maximum capacitance detected from the first sensor, C1, min is a minimum capacitance detected from the first sensor, C2, max is a maximum capacitance detected from the second sensor, and C2, min is a minimum capacitance detected from the second sensor.