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Title: Ultrasonic imaging system for in-process fabric defect detection

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.
Inventors:
 [1];  [1];  [2];  [2]
  1. (Naperville, IL)
  2. (Downers Grove, IL)
Issue Date:
OSTI Identifier:
871140
Assignee:
University of Chicago (Chicago, IL) ANL
Patent Number(s):
US 5665907
Contract Number:
W-31109-ENG-38
Research Org:
Argonne National Laboratory (ANL), Argonne, IL
Country of Publication:
United States
Language:
English
Subject:
ultrasonic; imaging; in-process; fabric; defect; detection; method; provided; monitoring; identify; plurality; transmitters; generate; waves; relative; receiver; means; responsive; generated; receives; coupled; generates; signal; integrated; peak; value; applied; digital; processor; digitized; processed; processing; median; filtering; step; filter; frequency; noise; mean; standard; deviation; filtered; calculated; compared; predetermined; threshold; values; ultrasonic wave; generated signal; threshold value; digital signal; predetermined threshold; signal processor; signal processing; ultrasonic waves; peak value; ultrasonic transmitter; frequency noise; ultrasonic receiver; filtered signal; signal process; waves couple; ultrasonic method; ultrasonic imaging; waves relative; transmitters generate; /73/