Re: Melles Griot filter info

["Lee Tarpley" <tarpley@xxxxxxxxxxxxxx>]

> I decided to take another look at the spectral response of CdS cells and
sure
> enough, the average peak sensitivity is in the visible for both selenium
and
> CdS with CdS having somewhat better red and near IR sensitivity while
silicon
> cells seem to peak further out in the IR. So it seems that silicon cells
would
> benefit from some kind of limiting filter while CdS cells may have a
relatively
> low long IR wavelength sensitivity.

Hamamatsu lists silicon photodiodes for cameras with spectral response
ranges as limited as 320-730 nm (essentially visible), also a Si photodiode
with an 840 nm upper range, although a response up to 1100 nm in the
near-infrared would be typical of many Si photodiodes including others
listed by Hamamatsu ( http://www.hamamatsu.com ).

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