Figure 1. Example circuit for the ADXL1002.
Condition monitoring is one of today’s core challenges in the use of mechanical facilities and technical systems in which, for example, motors, generators, and gears are used.
Planned maintenance is becoming more and more important for minimizing risk of production downtime not only in the industrial sector but wherever machines are used.
Among other things, the vibration patterns of the machines are analyzed for this. The vibrations caused by the gearbox are usually perceived in the frequency domain as a multiple of the shaft speed. Irregularities in the different frequencies point to wear, imbalance, or loose parts.
MEMS (microelectromechanical system)-based accelerometers are often used for measuring frequency. Compared with piezoelectric sensors, they feature a higher resolution, excellent drift and sensitivity characteristics, and a better signal-to-noise ratio (SNR). They also enable detection of low frequency vibrations close to the dc range.
In this article, a highly linear, low noise, wideband vibration measurement solution based on the ADXL1002 MEMS accelerometer is shown. This solution can be used for bearing analysis or engine monitoring and for all applications in which a large dynamic range of up to ±50 g and a frequency response from dc to 11 kHz are required.
Figure 1 shows an example circuit. The analog output signal from the ADXL1002 is fed via a 2-pole RC filter to the successive approximation register (SAR)analog-to-digital converter (ADC)AD4000, which converts the analog signal to a digital value for further signal processing.
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