a Does the axial Point Spread Function PSF change as a funct

a) Does the axial Point Spread Function (PSF) change as a function of distance? Why?

b) Does the height of the Point Spread Function (PSF) change as a function of distance? Why?

c) When sampling signal uniformaly in time and uniformly in wavenumber what are the effects?

d) Is there a difference between positive and negative values of the optical path length difference?

Solution

Ans

a) Point Spread Function (PSF) determines the response of imaging system to a point source. Yes, it does change as a function of distance because as the distance increases blurring is more. And the final image is given as the result of

Image = Object * PSF

PSF degrades as the distance from center of the observation is increased.

b) Height of the PSF also changes as a function of distance because it basically tells how the image would be different from the object due to the presence of imaging system. It is maximum at the center, then it attains gaussian form, i.e. symmetric form in both the directions and then decays.

d) The dc amplitude is greater when optical path length difference is positive and smaller when optical path length is negative.