Re: Measuring down to 300nm was RE:PMA news so far
Re: Measuring down to 300nm was RE:PMA news so far
- Subject: Re: Measuring down to 300nm was RE:PMA news so far
- From: Graeme Gill <email@hidden>
- Date: Fri, 07 Mar 2003 10:51:44 +1100
tlianza wrote:
>
It's kind of ironic that the very mechanism that causes flourescence makes
>
it difficult to measure the energy source that created it. Even if we had a
>
sensor, I don't think that any manufacturer would take the chance with the
>
eye safety issue for a field deployable instrument. It's hard on the hired
>
help....
I was referring to an instrument for measuring illuminants, so no UV light source
is necessary. The technical difficulties are interesting, but I notice that
various companies (ie. CVI, Ocean Optics) do offer instrument technology that
goes down to this range and below (200nm) using CCDs. The grating mode problem
does seem to fundamentally increase the cost of the instrument, but
maybe there is some scope for innovative solutions, such as a dual
grating instrument using (say) a dual line CCD sensor.
Ocean Optics claim that their xxx2000 instrument does 200-850nm
with "Single-piece, multi-bandpass detector coating to eliminate
second-order effects from 200-850 nm" and a 600 line grating
"blazed at 300 nm" - (whatever all that means), implying perhaps
that there may be other ways of tackling this problem ?
Graeme Gill.
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