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Measurement and the "circle" of research
"If you can't measure it, you're not doing science."
The expression evolved
to a large extent from the fact that the
process of scientific inquiry is based on
the ability to produce measurable and
reproducible results. Thus it comes as
no surprise that Ken Tobin, director of
ORNL's Measurement Science and Systems
Engineering Division, sees measurement
playing an increasingly central role in
the entirety of research performed at
the laboratory. "I think of measurement
science as an integral part of a 'circle'
of research that connects fundamental
and computational sciences," Tobin says. "Measurement systems are the key to
translating observations from the physical
world into data that can be analyzed
by computational systems. To complete
the circle, computational systems simulate
'virtual' new materials providing
researchers with the insights they need to
create these materials in the lab, which
requires significant measurement and
characterization capabilities." This process
starts the cycle again: materials, measurement,
computation, measurement and
back to materials. Tobin believes the
ability to accurately measure, characterize
and control physical, biological, environmental
or other engineered processes is
critical to all of the work done at ORNL,
regardless of whether the measurements
involve analyzing new materials, calculating
the impact of carbon in the environment
or controlling the electric grid.
![ORNL's Ken Tobin and Edward Chaum of UT Health Science Center Hamilton Eye Institute in Memphis, Tennessee examine a method to aid in the diagnosis of diabetic retinopathy and other blinding eye diseases.](images/a16_p27sm.jpg)
ORNL's Ken Tobin and Tom Karnowski examine a computer automation method to aid in the diagnosis of diabetic retinopathy and other blinding eye diseases. This program is a partnership with the University of Tennessee Health Science Center and the National Institutes of Health.
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Tobin's division specializes in exploring
and developing measurement systems that
sample the physical world to produce highfidelity
and reliable data. The systems the
researchers develop often extend the reach
of existing technologies or create entirely
new capabilities. "For example," Tobin
says, "one of our projects that links basic
science to applied research is our work
in developing nanostructured surfaces."
These unusual materials can be used for a
range of applications, including producing surfaces with an amazing ability to repel
water. These surfaces have practical
applications in anti-icing, fabric coatings
and novel sensors. Measurement science
enters the picture when researchers are
required to devise ways of determining how
efficiently these materials accomplish their
aims. "We have developed systems that
can accurately measure a material's ability
to repel water by looking at the contact
angles of water droplets on surfaces in a
variety of ways," Tobin explains, adding
"we are also using the same kind of nanostructured
materials to produce entirely
new measurement devices."
ORNL researchers also use their electronics
expertise to produce sophisticated
and highly customized measurement
systems. "The electronics for the Nuclear
Materials Identification System have
undergone quite a bit of evolution since we
developed it in the 1990s," Tobin says. The
instrumentation developed for the system
enables technicians to make precisely
timed measurements to scan containers to
determine the presence of nuclear materials.
ORNL scientists originally developed
this system in support of the Strategic Arms
Reduction treaties. Today the system is also
used by the Department of Homeland Security
in a range of applications, including
air cargo examination and monitoring for
highways, railways, ports and harbors.
In the biomedical area, Tobin's group
has developed computed tomography
systems to support mammalian genetics
work. "When the project began several
years ago, the idea was to be able to detect
nonvisible manifestations of disease in
animals using a high-throughput, highresolution
anatomic scanner. We made it
possible for geneticists to take measurements
from a large number of unique mice
without having to destroy them," Tobin
says. Recent spinoffs from the program
include the development of functional
imaging using single photon emission
computed tomography (SPECT) to show
how small animals metabolize glucose or
incorporate protein.
Tobin sees measurement science
playing an increasingly important role in
the laboratory's research. "We're making
inroads into new areas of measurement,"
Tobin says, pointing to microelectrical
mechanical systems as an area in which
his team is increasingly conducting
research. The sensors can be used for
a range of applications, from collision
avoidance to instrumentation, for small
modular nuclear reactors. The trend is
toward integrating the sensors into wireless
networks that communicate to a central
control system. "This kind of comprehensive
measurement and control system is an
important aspect of what we are trying to
achieve as we go forward in the measurement
research area," Tobin says. "We
continue to grow our research capabilities
and generate output that supports
the lab's energy mission, addressing new
methods, instruments and integrated
systems for energy efficiency, renewable
energy, transportation, nuclear energy and
nonproliferation technologies."
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