Ultrasonic imaging system for in-process fabric defect detection

Details Ultrasonic imaging system for in-process fabric defect detection Ultrasonic imaging system for in-process fabric defect detection

1996-03-04

1997-09-09

Williams, Hezron E.

Measuring and testing

Sheet, woven fabric or fiber

73602, 73598, 73618, G01L 504, G01N 2900

Patent

active

056659075

ABSTRACT:
An ultrasonic method and system are provided for monitoring a fabric to identify a defect. A plurality of ultrasonic transmitters generate ultrasonic waves relative to the fabric. An ultrasonic receiver means responsive to the generated ultrasonic waves from the transmitters receives ultrasonic waves coupled through the fabric and generates a signal. An integrated peak value of the generated signal is applied to a digital signal processor and is digitized. The digitized signal is processed to identify a defect in the fabric. The digitized signal processing includes a median value filtering step to filter out high frequency noise. Then a mean value and standard deviation of the median value filtered signal is calculated. The calculated mean value and standard deviation are compared with predetermined threshold values to identify a defect in the fabric.

REFERENCES:
patent: 5271284 (1993-12-01), Still et al.
patent: 5305239 (1994-04-01), Kinra
patent: 5398538 (1995-03-01), Williams et al.
patent: 5408882 (1995-04-01), McKinley et al.
patent: 5438872 (1995-08-01), Kobayashi et al.
patent: 5454045 (1995-09-01), Perkins et al.
patent: 5471878 (1995-12-01), Chiao et al.
patent: 5513531 (1996-05-01), Sapia et al.

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