10-信息光学1

信息光学
张洁 zhangjie@

Overview of class
Propagation of light and grating Lenses, and lens-based imaging methods Coherence and its effects on imaging
2

References
Joseph W.Goodman, Introduction to Fourier Optics, third edition, 电子工业出版社，2006 苏显渝，李继陶，信息光学，科学出版社，1999 吕乃光，傅里叶光学，北京：机械工业出版社， 2006 杨振寰著，母国光, 羊国光, 庄松林译，光学信息 处理，天津：南开大学出版社，1986。
3

Course requirements / Grading policy
Class Participation 30%
attendance, reading and other occasional assignments Assignments: Thursday, Next week
Final Project 70%
Open？
4

There are many interesting optics effects in real life…
Rainbows
作业1：彩虹的形成原因？衍射位置？2条？
5

Mirage
6

Please give some examples?
Diffraction Interference
隔着山还可以收听到中波段电台的广播，但却收看不 到电视节目，这是为什么？
无线电波 波长： 200—500m 电视信号 波长：0.556m
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Wavelength
8

Fourier transform
Real space
F {g }
F 1{G}
Frequency space
Fourier Transform
F {g } = G ( f x , f y ) = ∫ ∫ g ( x, y ) exp j 2π ( f x x + f y y ) dx dy
∞ ∞
[
]
Inverse Fourier Transform
F
1
{G} = g ( x, y ) = ∫ ∫∞ G ( f x , f y )exp[ j 2π ( f x x + f y y )] df x df y
∞
9

Linear systems
Point spread function (PSF)
Amplitude PSF
Imaging System
Point source
Linear space invariant response: convolution of object with point spread function
Imaging System
Object
Image
10

？

Homework 2

F{ }F{ }

F{ }

Shifted to

the right Shifted to

the top Amplitude Phase

Aperture in space domain Not quite

Centered

The condenser lens collects light from a

source. Different illumination schemes

are possible and will affect imaging.

The imaging lens images the sample onto a detector, in this case a CCD. The properties of the lens, such as the numerical aperture and aberrations, will affect the fidelity of the image.

techniques

Sample

Fourier transform

of sample