From: Jacques Augustowski (jacquesa@acd.ufrj.br)
Date: 02/04/00-06:33:22 PM Z
Colin,
I think you could take a look at Hamamatsu, http://optics.org/hamamatsu/press.html
they have GaP photo diodes that reads UV. Our UV light sources are not stable as for ex. the sun, so an integrator would seem a little better to use.
A nice precision integrator could be the Burr Brown ACF2101. As for a cosine corrector for the Gallium Phosphide cell, Teflon can be used, it is transparent to UV. If you need to measure certain bands of UV then
filters will be necessary, for example from 280 to 320 nm or 320 to 400 nm. Measuring narrow spectra can be a problem with glass filters.
Jacques
Colin McKie wrote:
> "Jeffrey D. Mathias" wrote:
> >
> >It is better to build an amplifier to amplify the current from the
> >device or use a sensitive accurate current meter. The impedance
> >matching is key. Measuring the voltage will not give a linear response
> >to light flux.
> >
>
> Jeffrey,
>
> The main advantage of measuring the Si cell voltage via a high impedance buffer is that it gives a logarithmic response, hence linear in stops (or log density). I use this in a simple transmission densitometer.
>
> I agree CdS is not the way to go, as it is mainly blue sensitive.
>
> Seems to be a lot of IR discussion lately; maybe we need to recruit even more alt-process people to the IR list!
>
> Colin
>
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