Apparatus and method for measuring spherical lens

Abstract

The invention provides an apparatus for measuring a spherical lens. The apparatus comprises a laser module group for continuously outputting laser, a spectroscope arranged on a laser path, an acousto-optic frequency shift module group arranged on transmitted light path to form measuring light, wherein the transmitted light is output by the spectroscope, a diaphragm and a beam expanding lens respectively arranged on the measuring light path to form beam expanding light, a measuring module group including a first measuring lens and a second measuring lens alternatively arranged on the beam expanding light path to form convergent laser beams, a lens to be measured arranged on the convergent laser beam path, a photoelectric detector arranged on the optical path of the reflected light output by the spectroscope, a referential signal module group connected with the acousto-optic frequency shift module group, a signal processing module group respectively connected with the photoelectric detector and the referential signal module group, and a computer connected with the signal processing module group and the measuring module group. The invention further relates to a method for measuring a spherical lens.

Description

technical field [0001] The invention relates to a measuring device and a measuring method of a spherical lens, in particular to a device and a method for simultaneously measuring the refractive index and central thickness of a spherical lens. Background technique [0002] Spherical lenses are the most commonly used optical components in optical systems. The refractive index and central thickness of spherical lenses are one of the important physical parameters of optical materials, and are also important factors that determine the quality of optical imaging. Especially for spherical lenses in high-performance optical systems such as lithography machine objective lenses and aerospace cameras, a slight deviation in the refractive index and central thickness of the spherical lens may cause unclear imaging, so the measurement of them must be strictly controlled. , reducing the error as much as possible. [0003] At present, the main methods for measuring the refractive index of ...

AI Technical Summary

Problems solved by technology

However, the traditional measuring device not only has a complicated structure, but also needs to know the parameters of the center thickness of the spherical lens in the measurement method to measure the refractive index of the spherical lens, or to measure the center thickness of the spherical lens only when the parameters of the refractive index of the spherical lens are known, and It is not possible to measure the refractive index and central thickness of spherical lenses at the same time

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