Optics: measuring and testing – By monitoring of webs or thread – For flaws or imperfections
Patent
1988-08-05
1990-08-28
Willis, Davis L.
Optics: measuring and testing
By monitoring of webs or thread
For flaws or imperfections
250562, 250572, G01N 2189
Patent
active
049520628
ABSTRACT:
A method and apparatus for detecting flaws in web material such as fabric comprises an array of optical sensors arranged in closely spaced relationship into at least one row spanning the web to be inspected. A light source is mounted in spaced parallel relationship relative to the sensor array and the web passes between the light source and the sensors. Each sensor produces a voltage signal that is proportional to intensity of light falling thereon and, therefore, to the amount of light transmitted by the portion of the web passing adjacent the sensor. The sensors are connected to a microprocessor that is programmed to compare their signals to standards representing signals produced by flawless fabric. A predetermined number of comparison results are combined and transformed into a single representative value that is compared with a preselected threshold value. If the representative value exceeds the threshold, a signal indicative of a flaw is produced by the microprocessor.
REFERENCES:
patent: 3001080 (1961-09-01), Neil
patent: 3835332 (1974-09-01), Bridges
patent: 3841761 (1974-10-01), Selgin
patent: 4249081 (1981-02-01), Cole et al.
Bean, III Vern W.
Borders Thomas H.
Turner, Jr. Thomas M.
Koren Matthew W.
Willis Davis L.
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