Measuring and testing – Vibration – By mechanical waves
Patent
1993-09-01
1996-05-07
Chilcot, Richard
Measuring and testing
Vibration
By mechanical waves
73600, 73618, G01N 2904, G01N 2900
Patent
active
055135315
ABSTRACT:
To improve and simply ultrasonic measurement of thin layers, an adaptive least-mean-square (LMS) implementation of a Wiener filter is used to deconvolve ultrasonic waveforms. This filter is structured as a finite-impulse-response (FIR) filter and solved using Widrow's adaptive linear combiner. The filter is implemented on a microcomputer with gating features for automated signal peak identification and measurement. The deconvolution process begins by assuming an impulse (the desired response) to a known input (the ultrasonic response). A transfer function is then determined that, when convolved with the response, results in the assumed impulse. The transfer function in this case is a long FIR filter typically requiring up to 128 taps to achieve acceptable results.
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Bernard Widrow et al., Adaptive Signal Processing, pp. 2, 99, 101-102 (1985).
Leonard David S.
Sapia Mark A.
Chilcot Richard
Combustion Engineering Inc.
Kananen Ronald P.
Noori Max H.
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