Tech Briefs Magazine - May 2021 - PIT-7

SWIR illumination is expensive - reducing pixel size can reduce sensor cost, but
only if the cost of the increased illumination to be able to see something doesn't
grow faster. It's a similar argument to why
quantum dot might be cost effective but
based on pixel size rather than on QE.
The goal for doing that is to reduce the
cost because the process is closer to a
wafer level process. These are area
devices, not line scan, and the pixels are
very small, approximately 5 μm pixels as
compared to the Teledyne DALSA Linea
SWIR GigE line scan camera available as a
1k resolution camera with 12.5 μm pixels.
The SWIR technology that most people seem to feel is most promising in
terms of maintaining the performance
of InGaAs but reducing cost is strained
layer superlattice. It's a multi-quantum
level detector and you grow different
semiconductors together in different
layers and engineer the band gap to give
you sensitivity that corresponds to photons in the SWIR - this is possibly three
to five years away.
.
. imaging technolIn conclusion, SWIR
ogy has multiple benefits, and can per-

Figure 4. Other common applications for SWIR imaging technology.

form in areas where other imaging cannot. SWIR can help differentiate
between objects that are very similar in
color, it can help to reveal properties or
defects through certain objects, and it
can help to differentiate between objects
at very high temperatures. Although
SWIR can be costly to implement, some
applications outlined here greatly bene-

fit from its use. As future developments
unfold, we anticipate even greater uses
of SWIR imaging with even more cost
effectiveness.
This article was written by Mike Grodzki,
Product Manager, Teledyne DALSA (Waterloo,
Canada). For more information, contact Mr.
Grodzki at teledyne.com, or visit http://
info.hotims.com/79413-220.

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Photonics & Imaging Technology, May 2021

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Tech Briefs Magazine - May 2021

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