Advanced Hyperspectral Imaging Sensors for UAVs
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Hyperspectral imaging has
emerged as a powerful and versatile means for continuous sampling of broad
intervals of the spectrum. Previously, this was a difficult proposition
because of the high speeds of air and space vehicle motion, resulting in
insufficient time for a spectrometer to concentrate on a small area of the
Earth's surface or an atmospheric target. A hyperspectral image consists of
about a hundred or more spectral bands adjacent to each other and the
characteristic spectrum of the target pixel is acquired in a hyperspectral
image. The precise spectral information contained in a hyperspectral image
enables better characterisation and superior identification of targets.
This technique has allowed hyperspectral sensors on board aircrafts,
satellites to capture reflected radiation from ground target sensors and
produce complete spectral signatures with no wavelength omissions. The
reflected radiation from the object is captured by the spectral detecting
system consisting of charge-coupled devices (CCDs), which can sample images
at very small intervals and plot the data as quasi-continuous narrow bands
that approximate a spectral signature rather than a histogramlike broader
band. Sensors on board such moving platforms play a vital role in the nature
of the image captured and its subsequent processing. Fitchburg, MA-based
Headwall Photonics Inc. has been a developer of imaging sensors, which find
application in many sectors. Augmented by years of dedicated research in the
area of hyperspectral imaging sensors, Headwall has recently released Micro-Hyperspec
VS.
David Bannon, Vice President, Sales and Marketing, Headwall Photonics, says,
"Headwall has established a very extensive intellectual property position in
the area of chemical sensing and hyperspectral imaging sensors. Our
Hyperspec VS imaging sensors are the leading hyperspectral imaging solutions
in use within the military/Department of Defense (DoD) and high-end research
communities. The application deployment for Hyperspec VS sensors has ranged
from target identification and tracking, to spectral tagging and
surveillance, to battle-space awareness. To this end, our sensors have been
deployed on piloted aircraft, unmanned aerial vehicles (UAVs) and satellite
platforms."
Apart from having exceptional spectral and spatial resolution, the Micro-Hyperspec
VS sensor has the ability to withstand harsh environments and is designed to
meet the small-size, rigid design and weight considerations for UAV
applications. With the ability to produce high-class images, due to the
patented, all-reflective concentric imaging spectrometer, the sensing
capabilities shown by this sensor are versatile. It also provides a high
signal-to-noise ratio and removes imaging distortions, such as stray light,
smile, keystone and so on, which pose a major challenge in spectral imaging
applications. Based on application requirements, the sensor has been
developed to operate in the visible and near infra-red range (350/400 nm to
1000 nm) or near infra-red range (900 nm to 1700 nm), facilitating a
customised sensor solution.
Bannon told Sensor Technology, "It has been Headwall’s experience that it
takes approximately 12 years to 15 years for technology to work its way out
of a strictly DoD application environment to a commercial or industrial
application set, and the market has reached that point where the technology
has matured. For example, Headwall’s Hyperspec sensors are our sixth
generation product, having been refined over time to provide exceptional
spatial and spectral performance."
The most significant aspect of Headwall’s Hyperspec sensors is the
commercial viability and deployment of hyperspectral imaging technology from
what was once considered a DoD application. Not surprisingly, these sensors
have been finding applications in civilian agencies (in some cases for the
last twelve years) in a wide range of environmental remote sensing
applications, such as the Ocean portable hyperspectral imager for low-light
spectroscopy (PHILLS) sensor. Additionally, after extensive collaboration
with key customers and based on market research, Headwall launched a new
family of integrated hyperspectral sensors to address a number of key
markets, such as product line scanning of moving Webs of product; process
manufacturing sectors utilising multipoint/multiprobe analysis for quality
control and process monitoring; noninvasive imaging/diagnosis utilising
patient scans or fiber bundles; drug discovery and the civilian airborne
sector.
"Headwall is very much interested in expanding collaboration into new
markets and application areas. To this end, we are working with leading
software integrators and establishing OEM [original equipment manufacturers]
partnerships with organisations that have application-specific experience in
markets requiring chemical sensing and imaging. For example, machine vision
companies as well as medical imaging companies who are looking to obtain
first-mover advantage in these high-growth areas. These collaboration
efforts were initiated in 2005 during business planning for the launch of
Headwall’s Hyperspec imaging sensors and continue to be a key element of our
business strategy," Bannon added.
Headwall Photonics was formed in 2003 as the result of a management buy-out
from Agilent Technologies.
Details:
David Bannon, Vice President, Sales & Marketing,
Headwall Photonics Inc.,
601 River Street,
Fitchburg, MA 01420.
Phone: 978-353-4003.
Fax: 978-342-3719.
URL:
www.headwallphotonics.com
E-mail:
dbannon@headwallphotonics.com
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