• ultra small spectrometer yields the power of a 1000 times bigger device

    From Jan Panteltje@21:1/5 to All on Fri Oct 25 03:41:52 2024
    Ultra-small spectrometer yields the power of a 1,000 times bigger device
    The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for anything from detecting disease to observing stars in distant galaxies.

    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

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  • From Martin Brown@21:1/5 to Jan Panteltje on Fri Oct 25 14:52:41 2024
    On 25/10/2024 04:41, Jan Panteltje wrote:
    Ultra-small spectrometer yields the power of a 1,000 times bigger device
    The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for anything from detecting disease to observing stars in distant galaxies.

    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    It is certainly a novelty and may work in some research where a very
    compact high resolution robust portable spectrometer might be useful. Identifying pigments on fake grand master paintings for instance. The
    kit is down to suitcase size (from half a room full of kit).

    It strikes me that calibration of the waveguide is everything and
    trusting AI to learn the patterns for each wavelength may not work for continuum spectroscopy even if it works well for emission line spectra.

    It sounds just a bit too good to be true...

    The last really cute trick was high resolution grating one way and prism
    at not quite right angles so as to map a line spectrum onto a normal rectangular CCD array. PE had a nice example of that in the 90's.

    --
    Martin Brown

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  • From john larkin@21:1/5 to All on Fri Oct 25 08:58:47 2024
    On Fri, 25 Oct 2024 03:41:52 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    Ultra-small spectrometer yields the power of a 1,000 times bigger device
    The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for anything from detecting disease to observing stars in distant galaxies.

    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    I want the opposite, a super broadband spectrometer, maybe 1800 to 300
    nm, to test laser diodes and LEDs. The spectrometer people fight for
    picometers of resolution over narrow bandwidths.

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  • From Jeroen Belleman@21:1/5 to Jan Panteltje on Fri Oct 25 22:26:20 2024
    On 10/25/24 05:41, Jan Panteltje wrote:
    Ultra-small spectrometer yields the power of a 1,000 times bigger device
    The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for anything from detecting disease to observing stars in distant galaxies.

    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    I cringe at the meaningless and incongruous comparison of a
    resolution figure with the width of a hair. Anyway, better
    resolution and smaller size inevitably go at the cost of
    sensitivity. I don't see these things being of any use in
    astronomy, although they may be useful in setups where the
    light intensity is plenty.

    Jeroen Belleman

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  • From Jan Panteltje@21:1/5 to JL@gct.com on Sat Oct 26 05:41:31 2024
    On a sunny day (Fri, 25 Oct 2024 08:58:47 -0700) it happened john larkin <JL@gct.com> wrote in <lrfnhjtq8266ial1uj0c6hh8anb8jhdbgl@4ax.com>:

    On Fri, 25 Oct 2024 03:41:52 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    Ultra-small spectrometer yields the power of a 1,000 times bigger device >>The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for
    anything from detecting disease to observing stars in distant galaxies. >>
    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    I want the opposite, a super broadband spectrometer, maybe 1800 to 300
    nm, to test laser diodes and LEDs. The spectrometer people fight for >picometers of resolution over narrow bandwidths.

    Prism?

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  • From Martin Brown@21:1/5 to john larkin on Sat Oct 26 13:33:27 2024
    On 25/10/2024 16:58, john larkin wrote:
    On Fri, 25 Oct 2024 03:41:52 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    Ultra-small spectrometer yields the power of a 1,000 times bigger device
    The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for anything from detecting disease to observing stars in distant galaxies.

    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    I want the opposite, a super broadband spectrometer, maybe 1800 to 300
    nm, to test laser diodes and LEDs. The spectrometer people fight for picometers of resolution over narrow bandwidths.

    Resolution and signal to noise is everything in deep sky spectroscopy.
    You can do a lot of physics based on the observed shape of a known to be
    very narrow band emission (or absorption) line.

    Much of the evidence for black holes comes from seeing temporal changes
    in the spectrum of a hot spot on the accretion disk and the jet hotspots.

    You will need at least two sensors for that wavelength range the best
    back thinned CCDs can do 300nm-1100nm but you will need something else
    beyond that.

    https://hamamatsu.magnet.fsu.edu/articles/quantumefficiency.html

    Hyperspectral cameras will go out to longer wavelengths than you want
    but cannot do the UV comfortably (fall off around 400nm).

    https://www.specim.com/technology/nir-hyperspectral-imaging/

    A rough and ready method is that emitters also make useable detectors if
    you really don't care about resolution and just want a rough idea of
    whether the LEDs are working and at what approximate wavelength.

    --
    Martin Brown

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  • From john larkin@21:1/5 to All on Sat Oct 26 08:31:45 2024
    On Sat, 26 Oct 2024 05:41:31 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Fri, 25 Oct 2024 08:58:47 -0700) it happened john larkin ><JL@gct.com> wrote in <lrfnhjtq8266ial1uj0c6hh8anb8jhdbgl@4ax.com>:

    On Fri, 25 Oct 2024 03:41:52 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    Ultra-small spectrometer yields the power of a 1,000 times bigger device >>>The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for
    anything from detecting disease to observing stars in distant galaxies. >>>
    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    I want the opposite, a super broadband spectrometer, maybe 1800 to 300
    nm, to test laser diodes and LEDs. The spectrometer people fight for >>picometers of resolution over narrow bandwidths.

    Prism?

    We did buy a fiberoptic 3-way WDM splitter, so we can tell 850 from
    1310 from 1550 laser diodes, make sure we got the right ones.

    You can actually see 850 if you poke the fiber directly in front of
    your eyeball.

    It would be cool to make a wideband spectrometer. We have some ideas,
    but optics isn't really our business.

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  • From john larkin@21:1/5 to jrwalliker@gmail.com on Tue Oct 29 09:36:01 2024
    On Tue, 29 Oct 2024 14:53:09 +0000, John R Walliker
    <jrwalliker@gmail.com> wrote:

    On 26/10/2024 16:31, john larkin wrote:
    On Sat, 26 Oct 2024 05:41:31 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Fri, 25 Oct 2024 08:58:47 -0700) it happened john larkin >>> <JL@gct.com> wrote in <lrfnhjtq8266ial1uj0c6hh8anb8jhdbgl@4ax.com>:

    On Fri, 25 Oct 2024 03:41:52 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    Ultra-small spectrometer yields the power of a 1,000 times bigger device >>>>> The tiny, relatively inexpensive devices could be used for customized astronomy research
    https://www.sciencedaily.com/releases/2024/10/241023130905.htm
    Summary:
    Researchers are designing new ways to make spectrometers that are ultra-small but still very powerful, to be used for
    anything from detecting disease to observing stars in distant galaxies.

    Seems a clever way to do, see picture of it here:
    https://news.ucsc.edu/2024/10/schmidt-bundy-24.html

    I want the opposite, a super broadband spectrometer, maybe 1800 to 300 >>>> nm, to test laser diodes and LEDs. The spectrometer people fight for
    picometers of resolution over narrow bandwidths.

    Prism?

    We did buy a fiberoptic 3-way WDM splitter, so we can tell 850 from
    1310 from 1550 laser diodes, make sure we got the right ones.

    You can actually see 850 if you poke the fiber directly in front of
    your eyeball.

    It would be cool to make a wideband spectrometer. We have some ideas,
    but optics isn't really our business.

    Pointing a smartphone camera at the light source can be useful. They
    see 850nm but not 1310. That doesn't help with distinguishing 1310
    from 1550 of course.
    John


    I had an ancient floppy-disk Sony camera that could see 1050.

    https://www.dropbox.com/scl/fi/1dqs4r7blqhc0yade0s7a/Cam_1050.jpg?rlkey=bnppsfqxevpxbp0unikp5xe8p&raw=1

    The laser was on loan from NIF, so it may have been pretty powerful.

    It would be cool to have a phone that can see IR, and a little set of
    filters to tell what wavelenght a laser is.

    I want a circular bandpass or lowpass filter that I can rotate to
    slice wavelengths.

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