TAU technology spots environmental hazards from inches to light-years away
 The HSR sensor in a TAU laboratory. |
The world may seem painted with endless color, but
physiologically the human eye sees only three bands of light — red,
green, and blue. Now a Tel Aviv University-developed
technology is using colors invisible to the naked eye to analyze the
world we live in. With the ability to detect more than 1,000 colors, the
"hyperspectral" (HSR) camera, like Mr. Spock's sci-fi "Tricorder," is
being used to "diagnose" contaminants and other environmental hazards in
real time.
Prof. Eyal Ben-Dor of TAU's Department of Geography and the Human Environment
says that reading this extensive spectrum of color allows the sensor to
analyze 300 times more information than the human brain can process.
Small and easy to use, the sensor can provide immediate, cost-effective,
and accurate monitoring of forests, urban areas, agricultural lands,
harbors, or marinas — areas which are often endangered by contaminants
and phenomena such as soil erosion or sediment dust. Using the
hyperspectral camera will ultimately lead to better protection and
treatment of the environment.
The HSR sensor, detailed in the journal Remote Sensing of Environment,
has both commercial and scientific applications, says Prof. Ben-Dor,
who has consulted for local and foreign space agencies in their use of
the technology. These applications can include anything from helping
companies adhere to regulations on environmental contamination to
measuring the extent of environmental damage caused by forest fires.
From far and wide
 Prof. Eyal Ben-Dor |
The sensor interprets reflected sunlight radiation
that bounces off an object, material, or environment. Each reflected
color represents a different chemical reaction between two compounds. "A
combination of absorption or reflection of energy creates the color
that the HSR sensor sees," explains Prof. Ben-Dor. The sensor's
extensive range — reading information from as close as 0.4 inches and as
far as 500 miles away — means it can be placed anywhere from the ground
itself to unmanned aircraft, satellites or weather balloons. The camera
can also be pointed towards the stars to help astronomers gain insight
into the make-up of a planet's atmosphere.
Most recently, Prof. Ben-Dor has used the technology
to survey different environments, including soil and sea, seeking to
identify problem areas. The area around gas pipelines is one site of
environmental contamination, he says. Leaks can be particularly damaging
to the surrounding earth, so the sensors can be used to test along a
pipeline for water content, organic matter, and toxins alike. In
agricultural areas, the sensor can be used to determine levels of salt
in the soil to save crops before they are destroyed.
The technique is also effective in marinas, which are
highly contaminated by gasoline and sealants from the undersides of sea
vessels. "This toxic material sinks, and becomes concentrated on the
sediment of the marina, which also contaminates nearby beaches," Prof.
Ben-Dor explains.
The color of possibility
Before the HSR technology was developed, samples of
potentially contaminated or endangered soil, sediment or water would
have to be taken to the lab for lengthy analysis. With the use of a
hyperspectral sensor, real-time analysis allows immediate action to
better environmental conditions. The sensor can also be used to
determine levels of indoor pollution caused by dust, analyze the
strength of concrete being used for buildings in earthquake zones, or
scan the environment around an open mine to look at the impact on human
health.
According to Prof. Ben-Dor, this technology's
potential is endless and can be used in disciplines such as medicine,
pharmacology, textile industry, and civil engineering. Without so much
as a touch, the sensor can provide in-depth analysis on environmental
composition. It's a method that can map and monitor the earth from
"microscope to telescope," he says.
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