Application of Single MEMS-Accelerometer to Measure 3-Axis Vibrations and 2-Axis Tilt-Angle Simultaneously
Abstract: This paper discusses
about a technique to developing an integrated sensor system for measuringmechanical
vibrations in 3-axis and tilt angle in the 2-axis simultaneously, using single
MEMSaccelerometer, i.e. MMA7361L. The MMA7361L is an analog accelerometer with
maximum sensitivity of 800 mV/g. This device has 3-channels output voltage (Vx,
Vy, Vz) in response to the acceleration "g" ofeach axis corresponding
work (gx, gy, gz). By using certain techniques in the design of signal
conditioning circuits, then the MMA7361L can used to detect 3-axis vibration
and 2-axis tilt angle at the same time. To accommodate the 5-signals from
output of the sensor system, is constructed a data acquisition systembased on
PIC16F876 microcontroller, which provides 5-channels internal ADC with 10 bits
resolution. Thus, the resulting integrated sensor system becomes very simple
and inexpensive. Results of experiment show that the developed sensor system
has proven having good performance. For the vibration sensor, voltage gains can
be set up to 60 dB (800 V/g) with low-level noise. While the tilt sensor is
capable of detecting up to ± 30 angle on the non-linearity of 4.5% (max), with
average resolution of about 0.06 degrees.
Author: Didik R. Santoso
Journal Code: jptkomputergg150105
