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Single axis laser diameter measurement gauge
Opmac 50AL, measuring range: 1-50mm
XZ：Standard diameter of the measured objective
The static beam launched by the laser forms moving parallel beam via scanning lens, after being reflected by high-speed rotating prism. The beam images on the photocell through focusing lens. When the object is placed at the measuring area, it will cover part of the beam and produce shadows. The voltage signal generated by the photocell will change corresponding to the shadows. The diameter of the object can be calculated by measuring the width of the changed part of the voltage signal.
http://www.opmac.net/