Unlock instant, AI-driven research and patent intelligence for your innovation.

Phase mask plate and wavefront coding system

A technology of phase mask and wavefront encoding, which is applied in the field of improved wavefront encoding system, can solve the problem that the phase transfer function cannot be changed, and achieve the effect of improving stability

Active Publication Date: 2014-07-02
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, when the system design is finalized, the phase transfer function corresponding to the phase mask cannot be changed

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Phase mask plate and wavefront coding system
  • Phase mask plate and wavefront coding system
  • Phase mask plate and wavefront coding system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The invention relates to a detachable phase mask plate, which is used to eliminate the low-frequency instability problem of the modulation transfer function of the traditional logarithmic phase mask system. The special feature of the mask is that the phase mask function is formed by superposition of two logarithmic functions with relative displacement, and its one-dimensional function expression is:

[0043] Q(x)=sgn(x+m)·(α·(x+m) 2 ·(ln(|x+m|)+β))+sgn(x+n)·(α·(x+n) 2 ·(ln(|x+n|)+β))

[0044] In the formula, α, β, m and n are the parameters of the phase distribution function, and x is the normalized coordinate. The value range of x is [-1, 1], and the value ranges of the offsets m and n are both [-1, 1].

[0045] refer to figure 1, in the system proposed by the present invention, after the imaging target 1 passes through the conventional imaging lens 2 and the phase mask 3, a blurred intermediate image is formed on the image detector 4, and then the image processing...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a phase mask plate and a wavefront coding system. A phase mask function of the phase mask plate is formed by superposing two logarithmic function with relative displacements, and the one-dimensional expression of the phase mask plate is Q(x)=sgn(x+m)*(alpha*(x+m)<2>*(ln(|x+m|)+beta))+sgn(x+n)*(alpha*(x+n)<2>*(ln(|x+n|)+beta)), alpha, beta, m and n are parameters of a phase distribution function, x is a normalization coordinate, x ranges from -1 to 1, and the offset m and the offset n respectively range from -1 to 1. According to the phase mask plate and the wavefront coding system, the phenomenon of instability of a modulation transfer function of a traditional logarithmic phase mask system in a low-frequency stage can be eliminated.

Description

technical field [0001] The invention belongs to the field of optics, and relates to a phase mask and a wavefront encoding system, in particular to a phase mask and a low-frequency instability based on the phase mask that can eliminate the logarithmic phase mask transfer function Improved wavefront coding system. Background technique [0002] The depth of field of extended optical 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 the wavefront in 1995. After the concept of coding, the extension of depth of field had a real breakthrough. [0003] Taking the one-dimensional optical system as an example, its defocus optical transfer function OTF can be obtained through the autocorrelation operation of the generalized pupil function, as follows: [0004] H ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
Inventor 赵惠魏静萱雷广智庞志海
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI