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Re: spectral cameras

Cross-posted to 3 groups.

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On 08/04/2020 06:24, dale wrote:
> On 4/7/2020 5:09 PM, dale wrote:
>> On 4/7/2020 4:17 PM, Alfred Molon wrote:
>>> In article <d2f8ea.nlu.19.1@news.alt.net>, dale@dalekelly.org
>>> says...
>>>>
>>>> RGB color cameras has proved to be good on smart phones for consumers.
>>>>
>>>> Is sensor resolution nearing the point to measure spectral visible
>>>> wavelengths instead of tricolor and is there a market for 
>>>> professional use?
>>>
>>> That doesn't depend on the sensor resolution. But you could make
>>> a sensor cell which is capable to measure light of (a limited
>>> number of) different wavelengths. Foveon is one example and the
>>> organic, multiple layer sensor design of Panasonic another one.
>>>
>>
>> kinda figured it wasn't a unique idea
> 
> back to resolution ...
> 
> the visible spectrum
> 
> https://en.wikipedia.org/wiki/Visible_spectrum
> 
> is from 380nm-720nm wavelengths
> 
> if you sample that in 10nm increments, that a low end spectrometer 20 
> some years ago for approx $10K would do ...

Here is how they actually do serious spectroscopy with plenty of light.

https://www.noao.edu/image_gallery/html/im0609.html

Its a low dispersion prism and a high resolution grating combo to 
illuminate a conventional 2D CCD with the entire stellar spectrum.

The other technology uses fibre optics to route positions on the sky 
onto a line at the input to a classic high dispersion spectrometer so 
that individual targets of interest can be done simultaneously.

You would gain very little useful improvement by sampling at 10nm since 
most LED emitters (apart from spot frequency lasers) have FWHM of 50nm 
and dyes and pigments are considerably worse.

-- 
Regards,
Martin Brown

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spectral cameras dale <dale@dalekelly.org> - 2020-04-07 15:05 -0400
  Re: spectral cameras Alfred Molon <alfred_molon@yahoo.com> - 2020-04-07 22:17 +0200
    Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-07 17:09 -0400
      Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-08 01:24 -0400
        Re: spectral cameras Alfred Molon <alfred_molon@yahoo.com> - 2020-04-08 19:28 +0200
          Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-12 20:29 -0400
            Re: spectral cameras geoff <geoff@nospamgeoffwood.org> - 2020-04-13 13:16 +1200
            Re: spectral cameras Alan Browne <bitbucket@blackhole.com> - 2020-04-13 17:01 -0400
              Re: spectral cameras dale <dale@dalekelly.org> - 2020-04-13 17:24 -0400
                Re: spectral cameras Alan Browne <bitbucket@blackhole.com> - 2020-04-13 18:58 -0400
        Re: spectral cameras Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2020-04-09 08:42 +0100
  Re: spectral cameras Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2020-04-08 07:51 +0100

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