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|NDT.net Issue - 2016-08 - Articles ||NDT.net Issue: 2016-08|
Publication: 8th European Workshop on Structural Health Monitoring (EWSHM 2016), July 5-8, 2016 in Bilbao, Spain (EWSHM 2016)
Session: Sensors other than PZT and FOS
Towards a New Low Power Low Noise Class B MEMS Accelerometer for Structural Health MonitoringPierre Etter, Stephan Gonseth, Raphaël Brisson, Felix Rudolf
Safran Group; Colibrys (Switzerland) Ltd, Yverdon-les-Bains, Switzerland
Abstract: MEMS vibrometers are very interesting due to their small size and potentially low cost. However there is often a tradeoff between low noise and high power for closed loop accelerometers and high noise and low power for open loop accelerometers. Safran Colibrys is developing state of the art low power open loop accelerometers that enable both low power and low noise operation. Such devices will be well suited to structural health monitoring in situations where wireless operation and self powered operation are highly desirable. For example the new released VS1002 accelerometer offers a power consumption of <10mW with an acceleration range of +/-2g and a noise (in band) of 7µg/√Hz, which gives a 90dB dynamic range for 100Hz bandwidth. This new family of MEMS accelerometers consist of a MEMS chip with an ASIC in the same package. As well as excellent performance, the final product fits into a small footprint of 9mmx9mm. After careful analysis of the performance of the VS1000 family of accelerometers, we have been able to identify improvements that could lead to a significantly lower noise level and permit a dynamic range of 110dB without changing the open loop architecture of the accelerometer which will enable us to retain all the excellent characteristics of the existing VS1000 sensor family. This paper will describe the current state of the art in low power MEMS accelerometers for structural health monitoring and describe the approaches to achieving a low power class B device.
Keywords: Other Methods (1134), embedded sensor (80), Modeling and Simulation (604), aerospace (926), civil engineering (1026), offshore (104), railway (290), vibration analysis (156), condition monitoring (241), Lifetime Management (54), vibration (38), seismic (2), Wireless sensors (24), MEMS (10), Piezoelectric sensors (104), Proof of concept (SHM in action) (29), accelerometers (4), capacitive sensors,