Glue by its own surface tension after the surface of the curved mirror, even with the most advanced laser displacement sensor measurement, because the mirror tilt will reflect the laser away from the direction of the receiving lens, many materials simply can not produce the correct result, and installed after the dispersion confocal lens of the glue top perfect arc curve can be shown. In particular, the measurement of transparent or translucent glue is more difficult, and it is easy to measure the height of glue with a spectral confocal probe.

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