Low Cost Vibration Measuring Device Using MEMS Accelerometer

摘要

This paper presents the overall design of an industrial vibration transmitter using MEMS capacitive accelerometer. It describes the accelerometer sensor interfacing circuit, rms-to-dc converter, voltage to current loop converter circuit design, calibration procedure, and mounting methods. The industrial vibration transmitter output can be customized to obtain either acceleration or velocity with root mean square (rms) or peak (pk) value signal. The output of the transmitter is a current signal (4-20mA) which is proportional to input acceleration (0-10g rms). The AC coupling circuit for accelerometer sensor interfacing, RMS detector and industrial current loop converter circuit are implemented in a single printed circuit board. The prototype consists of 2 pin top connector for power input (24VDC), current output signal and stainless steel mechanical housing assembly with bottom thread connection for mounting. The loop powered acceleration vibration transmitter is employed for vibration monitoring and control applications.