How to measure the thickness of an object by optical instruments
The reflectivity measurement of nano film can now widely used spectrometers, to calculate the film thickness.
Reflection refraction measures the thickness of a transparent object of known shape and known refractive index
Laser thickness measurement, the bottom of the object as the 0 point, with laser irradiation, and then read the light covered by the value of the block, you can measure the thickness, widely used in lens thickness measurement
