Patent ID: 6552667
Filing Date: 2003-04-22
Classification: G01B

Abstract:
A non-contact measuring method for producing a signal representative of a distance between facing surfaces of first and second parts which are closely spaced apart, the second part being grounded, the method comprising the steps of:(a) positioning a sensor on the surface of the first part, the sensor including first and second parallel, superimposed conductive plates electrically insulated from one another, the plates being parallel to the surface of the first part and electrically insulated therefrom, the second plate being located in between the first plate and the surface of the first part; (b) feeding the first plate of the sensor with a high frequency signal through a resistance; (c) feeding an input of a high impedance, low input capacity, unitary gain voltage amplifier with the high frequency signal through the resistance; and (d) feeding the second plate with an output signal of the amplifier, the output signal of the amplifier being representative of the distance between the two surfaces.