Lens refractive index measuring device and measuring method thereof

Abstract

The invention relates to a lens refractive index measuring device and method, the device comprises a diopter measuring module, an optical thickness measuring module, a confocal reflection measuring module and a measured lens, the diopter measuring module comprises a first light source module, a first collimating lens, a Hartmann diaphragm and a photoelectric detector Cam; the optical thickness measurement module comprises a second light source module, a second collimating lens, a third light source module, a third collimating lens, a focusing lens, a first beam splitter, a second beam splitter, a third beam splitter, a fourth beam splitter, a reflector, a photoelectric detector D1 and a photoelectric detector D2. The confocal reflection measurement module comprises a luminous source, a photoelectric detector D3, a Y-shaped optical fiber, a lens group and a mesoporous prism, the Y-shaped optical fiber comprises a first port, a second port and a third port, the device reduces the number of optical elements, simplifies the optical structure, is convenient to operate, reduces the cost, and reduces the space occupied area of the device.

Description

technical field [0001] The invention relates to the technical field of optical measurement, in particular to a lens refractive index measurement device and a measurement method thereof. Background technique [0002] The refractive index parameter is an important parameter index of the optical lens. In order to ensure the good imaging quality of the optical system, it is necessary to accurately measure the refractive index of the optical material. At present, the high-precision measurement of the refractive index of the optical glass material is carried out by the minimum deflection angle method. The minimum deflection angle method has high precision, a large wavelength range, and is a direct measurement. However, the premise of the minimum deflection angle test method is that a prism needs to be made for light refraction, and the angle of the prism needs to be accurately tested. Such a prism is difficult to manufacture. , the cycle is long; in addition, this method cannot te...

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Problems solved by technology

However, the lens refractive index measurement device proposed in this patent also has the following defects: 1. The design principle of the entire optical system is complicated, resulting in a complicated optical structure; 2. There are many optical measurement components used, large consumables, and high cost; There are many optical measuring components, which leads to the increase in the volume of the entire measuring device and takes up a lot of space

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