Using a MEMS sensor for vibration monitoring
This device offers an ultra- wide bandwidth, flat frequency response up to 6.3 kHz, and embedded filtering which eliminates frequency aliasing. Another major characteristic of this device is the very low spectral noise density. This is a very important advantage when low-frequency vibration needs to be captured.
PARAMETER VALUE
N. of axes
3-axis
Full Scale [g]
±2/±4/±8/±16
Output i/f
Digital: SPI
Bandwidth (-3 dB) [kHz]
5
ODR (kHz)
26.7
Noise Density [ μ g/√Hz]
90 (65 in single axis)
Current Consumption [mA]
1.1
Figure 1: Some MEMS sensor vibration sensor applications. (Image source: STMicroelectronics)
FIFO (3 kbyte) Programmable HP filter Interrupts Temp. sensor Embedded self-test
Features
The technical specifications of a vibration sensor need to be carefully analyzed to ensure that the sensor can meet the requirements of the target application. Table 1 depicts the major parameters of one of the latest vibration sensors offered by STMicroelectronics. This device can capture the vibration
in the 3-dimensional space (x, y, z). The three degrees of freedom offered by this device provide the flexibility to position the device in mounting orientation. The full-scale range of up to 16 g of acceleration per axis is sufficient to cover the vibration amplitude range that is typically required to monitor the health of a machine.
Operating Temperature
-40°C to +105°C
Operating Voltage [V]
2.1 ÷ 3.6
LGA 2.5x3x0.83 14-lead
Package (mm)
Table 1: The major parameters of the latest vibration sensors offered by STMicroelectronics.
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