Super-large depth-of-field imaging system based on wavefront coding

Abstract

The invention belongs to the optical field and relates to a super-large depth-of-field imaging system based on wavefront coding. The system comprises a wavefront coding imaging lens, a 1 / 1.8 inch image detector and a decoding processing unit. The wavefront coding imaging lens comprises a first lens, a second lens, a phase masking plate, a third lens, a fourth lens and a fifth lens. The first lens,the second lens, the phase masking plate, the third lens, the fourth lens, the fifth lens, the 1 / 1.8 inch image detector and the decoding processing unit are successively arranged on a same optical path. Simultaneously, parameters of the wavefront coding imaging lens, and especially the first lens, the second lens, the phase masking plate, the third lens, the fourth lens and the fifth lens are limited. The super-large depth-of-field imaging system based on wavefront coding provided in the invention can be used to simultaneously realize a large relative aperture, a super-large depth of field and a large field of view.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a depth-of-field imaging system, in particular to a super-large depth-of-field imaging system based on wavefront coding. Background technique [0002] Extending the depth of field of optical imaging systems has always been a hotspot in academic research. Since the mid-1980s, although various methods have been proposed for depth of field expansion, it was not until Dr. Dowski and Professor Cathey of the University of Colorado in the United States proposed in 1995 After the concept of wavefront coding, there was a real breakthrough in the extension of depth of field. [0003] Taking a one-dimensional optical system as an example, its OTF (Optical Transfer Function) can be obtained through the autocorrelation operation of the generalized pupil function, as follows: [0004] [0005] Among them, u and x are the normalized spatial frequency and the transverse coordinates of the aperture plane,...

AI Technical Summary

Problems solved by technology

[0012] The increase in relative aperture and field of view will greatly increase the difficulty of designing and optimizing the optical system. Traditional design methods have to use more lenses or use aspheric lens technology to achieve good correction of off-axis aberrations in large field of view optical systems

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