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Daniel Petka's latest activity
Daniel Petka
replied to the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
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Sure, here is the code I used: from numpy.fft import fft2, ifft2, fftfreq import numpy as np from matplotlib import pyplot as plt x =...
Apr 24, 2024
Daniel Petka
replied to the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
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Didn't express myself clearly here, sorry. I didn't refer to the delta function when I said that the integral cancel, but to the plane...
Apr 24, 2024
Daniel Petka
replied to the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
.
Yes, this was my point. The lens just brings the far field to a focal plane. The Fourier Transform happens in the far field. The...
Apr 23, 2024
Daniel Petka
replied to the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
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Thanks for the insight! I think I can pin point the bit that I'm struggling with here: If we're dealing with plane waves, then nothing...
Apr 23, 2024
Daniel Petka
replied to the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
.
I thought about it for a while now.. First of all, the Fourier Transform happens in the far field. People who say that a lens performs a...
Apr 23, 2024
Daniel Petka
replied to the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
.
Sorry, my bad. Should be fixed now. This is gibberish without images (possibly even with images) The question is: Why do plane waves get...
Apr 22, 2024
Daniel Petka
posted the thread
A
Fourier Optics: Why a Plane Wave contributes to just a single point
in
Optics
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If the distance between the input and the output screen d is large enough, then for a plane wave (with some spatial frequencies vx and...
Apr 22, 2024
Daniel Petka
posted the thread
Can the Least Squares Method be expressed as a convolution?
in
Advanced Physics Homework Help
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I started by converting the LSM from sum to integral form: $$f(x_c) = \sum_i[S(x_i)-F(x_i,;a,b,...)]^2 to f(x_c) = \int( S(x) -...
Mar 9, 2024
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