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Motionless bandwidth test for MEMS sensors

Posted: 15 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:MEMS sensors? motionless bandwidth test? MEMS bandwidth test?

For industrial systems that use MEMS accelerometers and gyroscopes, optimizing the bandwidth can be a critical consideration. This presents a classic trade-off between accuracy (noise) and response time. While most MEMS sensor manufacturers specify typical bandwidth, it is often necessary to verify the actual bandwidth of the sensor or of the complete system. Characterizing the bandwidth of accelerometers and gyroscopes typically employs shaker tables or other mechanical excitation sources. Accurate characterization requires a thorough understanding of the motion applied to the device under test (DUT). Several potential error sources must be managed in this process. One common source of error in mechanical bandwidth characterization is resonance. Mechanical resonance can result from several factors, including poorly maintained excitation sources, poor DUT coupling to an excitation source and reference sensor placement. Isolating these errors can be time consuming and can introduce risk into critical project schedules.

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