DetectionNew sensor detects undetonated bombs on sea floor

Published 27 November 2012

More than ten million acres of the world’s coastal waters are contaminated by undetonated explosives, according to the U.S. government; typically these small explosives rust and corrode at sea, making them even more dangerous; scientists have developed a sensor to detect undetonated explosives on the sea floor; the sensor is based on technology used to find mineral deposits underground

Scientists at the Commonwealth Scientific and Industrial Research Organization (CSIRO) have developed a sensor to detect undetonated explosives on the sea floor. It is based on technology used to find mineral deposits underground.

The sensor was developed as part of a project with U.S. government agency, the Strategic Environmental Research and Development Program (SERDP) and U.S.-based research organization Sky Research.

A CSIRO release quotes CSIRO electrical engineer Dr. Keith Leslie to say that the method for finding undetonated underwater explosives is very similar to that used to detect underground mineral deposits.

Our highly sensitive sensor — the high temperature superconducting tensor gradiometer — delivers significantly more information about the target’s magnetic field than conventional sensors used for this type of detection,” he said.

It provides data on the location, characterization and magnetic qualities of a target — whether it is a gold deposit or an explosive.”

More than ten million acres of coastal waters are contaminated by undetonated explosives, according to SERDP. Typically these small explosives rust and corrode at sea, making them even more dangerous.

The marine environment is difficult to sample due to electrical currents produced by waves, which affect underwater magnetic fields,” Leslie said.

In mineral exploration, near surface deposits are being exhausted, leading our search for minerals deeper underground, where targets are more difficult to detect with traditional surface and airborne measurements.”

The CSIRO sensor can provide valuable geological information that discriminates between prospective and non-prospective areas or targets. It avoids unnecessary drilling and minimizes the risk of overlooking valuable mineral deposits.

Our sensor has a critical advantage for small targets such as undetonated explosives, where only one or two measurements may be near the target,” Leslie said.

In mineral exploration, a string of measurements of the gradients of the magnetic field down a drill hole can determine the direction to the target.”

Eventually the technology may renew exploration efforts at abandoned sites where drilling programs were based on insufficient or inaccurate information. It also has the potential to help clear landmines.

The sensor has been proved in a stationary laboratory environment. Trials have been conducted to prove it in motion, in preparation for anticipated underwater trials.

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