On 11/21/2011 05:45 PM, Simon Quellen Field wrote:
> Your two slit trick is just a bad way of trying to simulate a point source at infinity.
> Instead, use a simple lens to collimate the light. Don't waste money on a lens
> corrected for chromatic aberration -- the light is going into a diffraction grating. :-)
>
> So, I hope it is now clear that your spherical aberration focus problem is simple to
> fix by using a 2D sensor.
I think so.
And the result will be guaranteed to be perfect focus,
> without having to carefully adjust the focal length of the optics (which will always
> be focused at infinity). So there is nothing to go wrong during assembly, and nothing
> to get out of adjustment in shipping or use.
OK.
The software auto-calibrates both in the
> frequency domain and in the amplitude domain (using the trick of the sample only
> blocking half the slit).
You need some simple light sources to calibrate, or is there a way with broad
spectrum light with few distinct lines during normal use (Normal as in
white light through a bio sample)?
I'm not understanding the bit about "the sample only blocking half the slit". Is
that written up somewhere on scitoys.com?
Thanks, Simon
JG
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