Contents
What is accelerometer data processing?
Accelerometers are wearable devices that measure accelerations of the body segment to which the monitor is attached. The signal is usually filtered and pre-processed by the monitor to obtain activity counts, i.e., accelerations due to body movement.
Why use high pass filter accelerometer?
High-pass filters are generally included in the analog circuits to prevent drift in piezoelectric accelerometer signals. Analog high-pass filters remove low frequency information, but also corrupt the amplitude and phase of the signal near the filter corner frequency.
What is the difference between accelerometer and vibrometer?
As nouns the difference between accelerometer and vibrometer is that accelerometer is an instrument for measuring acceleration while vibrometer is any of several engineering devices that measure the characteristics of a vibrating structure.
Do you need to do signal processing on an accelerometer?
The data provided in these reports are typically presented as they were recorded – the only processing has been to convert the data to engineering prototype units and to attach some zero reference to each time history. Some signal processing will generally be necessary, especially for integrating accelerometer records.
Why are high pass filters used in an accelerometer?
High-pass filters are generally included in the analog circuits to prevent drift in piezoelectric accelerometer signals. Analog high-pass filters remove low frequency information, but also corrupt the amplitude and phase of the signal near the filter corner frequency.
How is the sensitivity of an accelerometer determined?
Sensitivity is specified in mV per G. If typical accelerometer sensitivity is 100 mV/G and you measure a 10 G signal, you expect a 1000 mV or 1 V output. The exact sensitivity is determined from calibration and usually listed in the calibration certificate shipped with the sensor. Sensitivity is also frequency dependent.
What should the corner frequency of an accelerometer be?
The best average agreement between the potentiometers and accelerometers was obtained using a corner frequency of about 0.15 Hz. Figures 2 and 3 show comparisons of displacement time histories obtained by integrating acceleration time histories together with those recorded by linear potentiometers.