Re: Resolution with Gaussian point spread function
- From: Jamie <jacarter3@xxxxxxxxxxxxx>
- Date: Mon, 25 Jun 2007 07:14:08 -0700
By the way, how do you get a Gaussian point spread function?
The only "standard metric" for an aberrated system is to perform an
MTF calculation. This is too complex (not worth while) for an
individual to program.
Actually, it is possible to get a PSF that is very Gaussian like when
you have many effects contributing to the system response (remember
the central limit theorem). The optical system response includes more
than just the as-designed PSF. Other effects will pertain in real
world optical systems and these may include the optics (non-centered
as-built residuals), spatial sampling (FPA), jitter, and very small
angle diffraction effects (surface figure errors with long spatial
periods or spurious diffraction orders if system uses kinoforms or
binary optics).
Most FLIR system engineers use the Gaussian approximation as it makes
for easy math when distributing first order requirements and
tolerances for different system level effects. Gaussian PSFs are
easily convolved (just with an RSS) and the MTF is also very easy to
calculate. This makes it easy to switch between PSF and MTF based
requirements.
James A Carter III
http://www.opticalconsulting.com
.
- References:
- Resolution with Gaussian point spread function
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- Re: Resolution with Gaussian point spread function
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- Re: Resolution with Gaussian point spread function
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- Re: Resolution with Gaussian point spread function
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