System and method for nondestructive measuring refractive index and thickness of lens

摘要

The present invention discloses a system and method for nondestructively measuring the refractive index and the central thickness of a lens. The system comprises a radius measurement module arranged for measuring the curvature radius of the first surface of the lens; a focus measurement module arranged for measuring the best focus distance of the first surface of the lens; and a calculation module arranged for performing the first or the second calculation process according to the lensmaker's formula. Wherein, when the central thickness is given, the calculation module performs the first calculation process according to the curvature radius, the best focus distance and the central thickness to calculate the refractive index. On the contrary, when the refractive index is given, the calculation module performs the second calculation process according to the curvature radius, the best focus distance and the refractive index to calculate the central thickness.

主权项

1. A measurement system for nondestructively measuring a refractive index or a central thickness of a lens, comprising:
a radius measurement module, arranged for measuring a curvature radius of a first surface of the lens; a focus measurement module, arranged for measuring a best focus distance of the first surface of the lens; and a calculation module, arranged for performing a first calculation process or a second calculation process according to a lensmaker's formula; wherein, when the central thickness is given, the calculation module performs the first calculation process according to the curvature radius, the best focus distance and the central thickness in order to calculate the refractive index; when the refractive index is given, the calculation module performs the second calculation process according to the curvature radius, the best focus distance and the refractive index in order to calculate the central thickness.