do you know how the iSis behaves in comparison to
instruments with conventional illumination
Unfortunetely no. This was exactly what I had in mind with
my "(and new ones pop in!)" remark.
LED illuminantion is often more "spikey", as you mention,
and obviously not corresponding, in terms of UV content,
to typical illumination we encounter in our daily lives
(at least it is not common nowadays). Tungsten lamps,
found in many portable instruments, is close to halogen
room lamps, and Xenon, found in many bench top instruments
and some portable ones also, is close to daylight.
I am sure we will see a lot of discussions on the relation
of the wavelength content vs fluorescence, as well as on
the usefulness of solutions some manufacturers have taken
to mitigate/solve the issue.
I'm also not sure about the long-term steadiness of
(phosphor based) white LEDs http://en.wikipedia.org/wiki/LED). Are they used in the
iSis?
The actual spectros I have seen (not the iSis), and the
patents I have read relative to illumination in spectros
were all using combinations of individual wavelengths
LEDs, with no phosphor based white LEDs. However, as the
LED technology evolves rapidly, I think we will see it
soon. Phosphors do age, but the low cost will make this
solution attractive (imagine using such a source in a
colorimeter now used only to calibrate emissive displays,
i.e Eye-One Display, Spyder).
Danny Pascale
email@hidden
www.BabelColor.com
On Fri, 23 Feb 2007 09:37:27 +0100
Klaus Karcher <email@hidden> wrote:
email@hidden wrote:
This problem should go away with LED illumination (and
new ones pop in!).
Dany,
do you know how the iSis behaves in comparison to
instruments with conventional illumination in practice?
I'm a little bit concerned about it because typical LED
spectra are quite spiky AFAIK.
I'm also not sure about the long-term steadiness of
(phosphor based) white LEDs (See also
http://en.wikipedia.org/wiki/LED). Are they used in the
iSis?
TIA,
Klaus
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