or more at a rate of about 20 particles per
The device’s performance could be improved by quieter diode lasers, better
locking electronics and improvements in
the manufacturing of the high-reflectivity
mirrors. Shane Murphy noted that future
needs include making the device smaller
and more portable. There also is a desire
to shift to a laser with a shorter wavelength than that of the current red source.
“One of the real big interests scientifically right now is what organics do, and
they’re going to absorb down in the blue
wavelengths. They’re not going to do
anything in the red,” he said.
Advances in laser technology mean that
this switch can be accomplished with a
change of the laser diode source. Murphy
said that a smaller version of the device
will be ready for deployment this year in
Barbados to measure dust blown from the
Commercially available photonics-
based particle analysis includes sizing
via laser scattering and probing via pho-
toacoustics, which involves the rapid
heating of particles and detection of the
sounds generated. The technique produces
information about particle composition,
since both heating and cooling are influ-
enced by particle makeup.
New solid-state lasers with
integrated fiber delivery are ideal
for fluorescence based applications
where stable power and beam
profiles are needed for high
confidence results and imaging.
Collimation optics, PM fiber and
modulation (488nm) are optional.
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