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Three methods exist for testing the response times of pressure transmitters in situ: the power interrupt test, the noise analysis technique, and the pink noise technique. The noise (or random signal) analysis technique is a passive in situ technique that does not interfere with plant operation, uses already existing plant sensors and instrumentation, accounts for the effects of process conditions...
Instantaneous frequency (IF) is a fundamental concept that can be found in many disciplines such as communications, speech, and music processing. In this letter, analysis of an IF estimator, based on a time-frequency technique known as S-transform, is performed. The performance analysis is carried out in a white Gaussian noise environment, and expressions for the bias and the variance of the estimator...
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