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Focal power detecting system of multifocal lens based on Talbot effect

A detection system and multi-focus technology, applied in the direction of testing optical performance, etc., can solve the problems of multiple measurements of multi-focal lenses, harsh measurement conditions, and large amount of calculation, and achieve simple optical path construction, real-time processing, and improved stability. Effect

Inactive Publication Date: 2013-05-22
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

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 filter method needs to select different optical components for different glasses, which is very inconvenient

Method used

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  • Focal power detecting system of multifocal lens based on Talbot effect
  • Focal power detecting system of multifocal lens based on Talbot effect
  • Focal power detecting system of multifocal lens based on Talbot effect

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Embodiment Construction

[0014] Such as figure 1 The schematic diagram of the focal power detection system of the multi-focus lens based on the Taber effect is shown in the figure. The laser light source 1 emitted by the laser is expanded and collimated by the spatial filter 2 and the collimator lens 3 to form parallel light. After passing through the multi-focus lens 4 to be tested, the Through two main Ronchi gratings 5 ​​and auxiliary Ronchi gratings 6 with an included angle, the distorted Moiré fringes containing the focal power information of the measured lens are obtained on the CCD receiving screen 7, and image processing and calculation are performed by a PC 8 to obtain The focal power information of the measured lens is output.

[0015] The 532nm high-steady-state semiconductor laser is used as the light source, and the human eye is most sensitive to light of this wavelength, so it is more accurate and effective to use the light source of this wavelength to measure the multi-focal lens. The ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
Inventor 张学典侯英龙董世琨常敏
Owner UNIV OF SHANGHAI FOR SCI & TECH
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