[argyllcms] Re: DIY reflective spectro

Stephan Bourgeois wrote:

> The optical section was a replica of cardboard spectroscopes available
> for schools.
> * card 0.5 mm slit
> * holographic diffraction grating 1000 lines/mm
> * acrylic collimating lens +9.4 dioptr. 106mm diam.
> * baffles made of foamboard coated with black card
> lens and diffraction grating are available from www.astrodienst.de

Not any more. That site seems to only contain Horoscope's now!

> Sensor
> * Philips Toucam Pro II webcam with standard lens. This webcam uses a
> Sony HAD 640x480 colour CCD
> * linux drivers and control (setpwc, dov4l)
> Camera settings: 5fps open shutter, no noise reduction, no compression,
> sharpness 0, gamma 2.2, gain 12000 (0..65535)

Most instruments use a linear CCD or CMOS sensor, something
like this: <http://www.eureca.de/pdf/optoelectronic/toshiba/TCD1304AP.pdf>

> If anybody is interested, please let me know. I dropped the project
> because I felt very much on my own. In any case I hope you enjoyed
> reading about this!
> Stephan.

Interesting project.

Looking around, I guess that a lot of the bits for even
a reasonably advanced instrument are out there (e.g.
Edmund Optics have an extensive array of diffraction gratings),
but knowing how to put it all together is something else.

Graeme Gill.

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