The possibility of practical development of an automatic fabric inspection system depends upon the following two points. One point is what kind of detector should be used, how to use the detector, and then, what degree of fabric defects can be detected. The another one is how to process the detecting signals from the fabric defects in order to recognize defects. Therefore, it is important to select the kind of detectors and to make the ability of the detector clear.
In this paper, the detectability of 23 kinds of defects on nylon filament plain fabrics was discussed using a photomultiplier tube and two kinds of light sourses, tungsten and He-Ne lasser.
The properties of reflected and transmitted light through the fabric defect differed according to the kinds of defect. The change of reflected light of laser was larger than that of tungsten. The detecting condition of 45-degree lighting and vertical reflecting were better than another conditions to detect fabric defects.
Fabric defects such as slippage, hole, crack, etc. are easily detected by transmitted light, and those such as tight pick, warp falling, double picks, etc. are easily detectable by vertical reflected light.
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