Refractive index measurement of spectacle lenses

Details Refractive index measurement of spectacle lenses Refractive index measurement of spectacle lenses

G - Physics

01

N

G01N 21/41 (2006.01) G01B 9/02 (2006.01) G01M 11/02 (2006.01)

Patent

CA 2146300

Apparatus for measuring the index of refraction of glass such as spectacle lenses without measuring the surface geometry of the glass. In particular, an embodiment of the present invention includes: (a) a source of a substantially spatially coherent beam of radiation; (b) a beamsplitter to provide a sample beam and a reference beam in response to the beam; (c) a translatable retroreflector which reflects the reference beam; (d) a holder to hold the material in the path of the sample beam, the holder including a retroreflector which reflects the sample beam back through the material and a caliper apparatus to measure the thickness of the material where the sample beam passes through; (e) a detector which detects the reflected reference beam and the reflected sample beam to produce a detector output signal; and (f) an analyzer which determines a position of the translatable retroreflector in response to the detector output signal and which determines the index of refraction of the material in response to the position of the translatable reflector means and the thickness of the material.

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