Patent ID: 6357296
Filing Date: 2002-03-19
Classification: G01C

Abstract:
An inertial input processing circuit for a vibratory sensor with a constrained resonator comprising:a first pickoff electrode for detecting a radial displacement of a standing wave, said first pickoff electrode positioned to detect a time-varying radial displacement of said standing wave midway between an antinode position and a first adjacent node position and generate a first voltage signal characteristic of the time varying radial displacement, and a second pickoff electrode positioned to detect a time-varying radial displacement of the standing wave midway between the antinode position and a second adjacent node position and generate a second voltage signal characteristic of the time varying radial displacement; a signal summing element connected to said first and second pickoff electrodes, said signal summing element generating a summed signal by adding the first voltage signal to the second voltage signal; a signal differencing element connected to said first and second pickoff electrodes, said signal differencing element generating a differenced signal by subtracting the second voltage signal from the first voltage signal, such that a contribution from a secondary harmonic pattern present in said first and second voltage signal is eliminated in the differenced signal; an amplifier connected to said signal differencing element for receiving the differenced voltage signal and generating an amplified differenced signal; and a multiplexor connected to the signal summing element and the signal differencing element for receiving the summed voltage signal, the differenced voltage signal, and the amplified differenced voltage signal.