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INTERNAL DIAMETER MEASURING METHOD FOR TRANSPARENT TUBE

  • US 20170167854A1
  • Filed: 11/30/2016
  • Published: 06/15/2017
  • Est. Priority Date: 12/15/2015
  • Status: Active Grant
First Claim
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1. An internal diameter measurement method for an internal diameter of a transparent tube using a parallel laser light beam, the method comprising:

  • providing a light projector that forms the parallel laser light beam;

    providing a photoreceiver that receives the parallel laser light beam from the light projector;

    arranging the transparent tube between the light projector and the photoreceiver;

    obtaining, from the photoreceiver, a detection signal indicating an amount of received light corresponding to a width direction position of the parallel laser light beam;

    detecting a peak in the detection signal formed by a light beam reflected by an inner circumferential surface of the transparent tube and incident to the photoreceiver, detecting width direction positions of two intersections where the peak crosses a predetermined threshold value;

    calculating, from an average value of the two intersection points, the width direction positions of the light beam reflected by the inner circumferential surface of the transparent tube; and

    performing a geometric calculation from the width direction positions of the light beam such that the internal diameter of the transparent tube is measured.

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