Focal power detecting system of multifocal lens based on Talbot effect

Abstract

The invention relates to a focal power detecting system of a multifocal lens based on Talbot effect. A laser device sends out laser light sources which can form parallel light through beam expanding and collimation of a spatial filter and a collimating lens, and the parallel light sequentially passes through a main Ronchi grating and an auxiliary Ronchi grating which have an included angle after passing through a multifocal lens which needs to be measured. Distortion Moire fringes containing focal power information of the measured lens are obtained on a receiving screen, and the focal power information of the measured lens is obtained by using a personal computer (PC) to perform image processing and computing on the distortion Moire fringes obtained on the receiving screen. Light rays pass through a lens with different focal power, and the lens enables the light rays to generate phase differences, so that corresponding distortion Moire fringes are generated. Furthermore, a focal power information parameter of the measured lens is obtained by processing the Moire fringes, and therefore measurement of the multifocal lens is achieved. One-time measurement of the multifocal lens is achieved, and real-time processing of a computer can automatically work out the focal power information of the lens, and therefore efficiency is improved. Furthermore, the focal power detecting system of the multifocal lens based on the Talbot effect is simple in light path construction, and therefore stability of the system is improved.

Description

technical field

[0001] The invention relates to a lens focal power testing technology, in particular to a multi-focus lens focal power testing system based on the Moiré fringe distortion technology of the Taber effect. Background technique

[0002] At present, multi-focal lens has gradually entered people's life. As a new technology, it solves the vision correction of far, medium and near distances. The visual imaging is more complete and clear, and the comfort is increased. However, there has been no good way to measure the focal power of multi-focal lenses. The original single-vision lens focal power measurement equipment can only measure one point. Measuring multi-focal lenses requires multiple measurements and requires good measurement experience. and operating skills. However, the existing Hartmann method has relatively harsh measurement conditions, and the processing requires a large amount of calculation; the Fourier filtering method needs to select different optical...

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