Vibration Sensor for Wireless Condition Monitoring
2008 (English)In: Proceedings of the Pan Pacific Microelectronics Symposium, 2008, 305-331 p.Conference paper (Other academic)
A microelectromechanical system (MEMS) accelerometer has been manufactured for wireless vibration measurements on AC motors for condition monitoring. The vibration sensor element has been encapsulated with glass using wafer scale adhesive bonding with Benzycyclobutene (BCB). Cavities in the glass allow the moving mass on the silicon sensor to vibrate freely. The wafer scale packaging greatly simplifies the subsequent packaging which includes mounting on a ceramics substrate. The ceramic board with the sensor element is densely packed inside a sensor node together with other components. The battery driven sensor node solution is optimized with regard to small scale and low power consumption to reduce price and extend life time. The sensor element has a linear response up to 30 g with a sensitivity of 0.3 mV/Vg and a resonance frequency of 7.7 kHz. Measurements were performed on a bare, unpackaged die and after glass encapsulation. The only recognizable effect of the glass encapsulation on the frequency response is a moderate damping.
Place, publisher, year, edition, pages
2008. 305-331 p.
BCB, wafer bonding, vibration sensor, wireless sensor network
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-91416OAI: oai:DiVA.org:kth-91416DiVA: diva2:510015
Pan Pacific Microelectronics Symposium. Sheraton Kauai Resort, Kauai, HI. January 22 - January 24 2008
QC 201205072012-03-142012-03-142012-05-07Bibliographically approved