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A novel approach for online sensor testing based on an encoded test stimulus

Dumas, N. and Xu, Z. and Georgopoulos, K. and Bunyan, R. J. T. and Richardson, A. (2007) A novel approach for online sensor testing based on an encoded test stimulus. In: ETS 2007: 12th IEEE European Test Symposium, Proceedings. IEEE COMPUTER SOC, LOS ALAMITOS, pp. 105-110. ISBN 978-0-7695-2827-4

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Abstract

This paper presents a technique that enables online testing of sensors through the superposition of the test stimulus onto the measurand Perturbations due to the surrounding environment can very often introduce fluctuations in the test output that is a major concern for this type of sensor testing. This paper proposes a novel approach to tackle this problem by encoding the test stimulus using a pseudo-random sequence. The trade-off between the level of rejection of a perturbation and the overall test time is studied. In the case of the MEMS accelerometer considered in this paper, it is demonstrated that the rejection is more than 20dB for a test time of 2.55s. Furthermore, excessively strong perturbations can be monitored so that the test status is updated only if the accuracy of the test signal permits so. It is shown that the proposed solution is compatible with the technique that consists of injecting the stimulus through the sensor bias for the case study MEMS accelerometer.

Item Type: Contribution in Book/Report/Proceedings
Uncontrolled Keywords: online testing ; MEMS testing ; pseudo-random sequence ; covariance ; correlation
Subjects:
Departments: Faculty of Science and Technology > Engineering
ID Code: 50469
Deposited By: ep_importer_pure
Deposited On: 25 Oct 2011 13:26
Refereed?: No
Published?: Published
Last Modified: 24 Jan 2014 06:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/50469

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