Improving Bias Stability in High Temperature Accelerometers

In many industrial applications certain processes require monitoring where the temperatures exceed the long term capabilities of standard accelerometers, which may work for a few weeks or months but tend to fail over the long term. Older designs of higher temperature internally amplified accelerometers utilized components that were temperature tolerant, but suffered sensor bias voltage drift over time. This phenomenon was not often a problem for route data collection in the past as the sensors were only powered for short periods, and had little time in the powered state for the bias to drop. However, with so many manufacturing facilities turning to continuous or automated monitoring systems, a drift in the bias voltage will frequently cause a sensor fault notification to be generated in the system and a possible work order to be generated unnecessarily. This type of unrequired action causes added expense and reduces the confidence of plant managers in maintenance programs.

   

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