Measurement system using a resonant sensor and method of operating a resonant sensor based measurement system

摘要

A system is provided for automated, high dynamic range measurements of a resonant sensor. The system comprises a variable frequency signal source 100, 101, 102 configured to provide first and second signals, a resonant sensor 103 connected to receive the first signal, a phase comparator 111 connected to the output of the resonant sensor and to receive the second signal, and a controller 114 connected to the phase comparator. In a first mode, the controller controls the desired frequency of the signals from the variable frequency signal source based on a value of the phase comparator output signal to lock the frequency of the input signals to a resonant frequency of the resonant sensor. In a second mode, the controller disconnects from the variable frequency signal source and records an open loop output signal indicative of the physical parameter to be measured based on the response of the resonant sensor.