Abstract
Effects of a fully natural aging of MEMS accelerometers are evaluated with regard to changes in their performance. Two models of commercial dual-axis accelerometers (two pieces of ADXL 202E and 203 by Analog Devices Inc.) with analog outputs were tested over a period of about 10 and 4 years, respectively. A custom computer controlled test rig was used for performing relevant experimental studies, employing the gravitational acceleration as the reference source. A methodology of determining the proposed indicators of aging phenomena is presented and discussed. Changes of the offset voltage and the scale factor were observed and a way of evaluating the overall error due to combined influence of these two parameters is proposed. It was found out that the changes of the output voltage generated by the tested accelerometers were considerable, resulting in respective maximal errors of about 52 mg (2.6%) (ADXL 202E) or 20 mg (1%) (ADXL 203). Simple ways of reducing the effects of aging are proposed.
Highlights
IntroductionM EMS accelerometers are applied more and more often in many kinds of systems and devices, to directly sense constant or variable acceleration (including vibration) or tilt [1]; owing to appropriate signal processing (integration or differentiation) they enable determination of velocity and position or jerk and jounce (shock)
M EMS accelerometers are applied more and more often in many kinds of systems and devices, to directly sense constant or variable acceleration or tilt [1]; owing to appropriate signal processing they enable determination of velocity and position or jerk and jounce
Even some scuba diving instruments have been equipped with MEMS accelerometers, e.g. diving computer Vyper or Cobra by Suunto company [5]
Summary
M EMS accelerometers are applied more and more often in many kinds of systems and devices, to directly sense constant or variable acceleration (including vibration) or tilt [1]; owing to appropriate signal processing (integration or differentiation) they enable determination of velocity and position or jerk and jounce (shock) Due to their small dimensions they are the only solution possible in the case of devices having miniature size, like mobile microrobots [2] and PDAs (Personal Digital Assistant) such as cell phones, tablets, palmtops, photo cameras, smartwatches, or wearable devices like orthotic robots [3]. Even some scuba diving instruments have been equipped with MEMS accelerometers (enabling tilt compensation for the embedded electronic compass [4]), e.g. diving computer Vyper or Cobra by Suunto company [5] Besides their miniature dimensions, the most advantageous features of MEMS accelerometers are satisfactory metrological parameters, low power consumption, easy integration with. Date of publication August 19, 2020; date of current version December 16, 2020.
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