Phase-locking control of the Coriolis meter’s resonance frequency based on virtual instrumentation

Theoretical and experimental investigations of flow pulsation effects in Coriolis mass flowmeters

“…The DAQ board also employs an analog output to control the operation of the shaker, three analog inputs to acquire the data of the excitation (from the electromagnetic exciter) and detection signals (from the two IEPE accelerometers) at the Coriolis-type flowmeter's tube and one analog output to generate the control signal for the excitation frequency of the function generator. The mechanical resonance of the electro-mechanical system of the Coriolis-type mass flowmeter under test is preliminarily established under steady-state flow conditions with the help of a control system based on the principle of the phase-locked loop [21]. The control system's algorithms and the signal processing of all the other measurement signals are realized in the LabVIEW programming environment.…”

A parametrically amplified MEMS rate gyroscope

“…6, which includes phase and amplitudes measurements by orthogonal demodulation [16], phase locked loop (PLL) phase tracking control [17,18], vibration amplitude PID control [19]. A detailed description of the main operations within the control system will be discussed in the subsequent sections.…”

A Novel Drive Scheme of Coriolis Mass Flowmeter Based on Adaptive Fuzzy Sliding Mode Control

“…In [1][2], automatic gain control (AGC) loop is employed to provide a variable gain, which is multiplied by the amplitude difference to produce a correction voltage, thereby achieving a stable amplitude control. In [3][4][5], owing to the phase difference between the driving signal and the driving mode vibration signal is , phase locked loop (PLL) is proposed to track natural frequencies in the resonant state. In [6], another frequency control method of self-oscillation is presented.…”