Magnetism can be used to identify weapons and explosive materials that might be at risk in the line of RF energy.
Radio-frequency-identification (RFID) tags are widely used for inventory and identification chores. But in some environments, such as around explosives, an RF signal might trigger an unwanted reaction. Another identification solution is needed for these cases, and it is turning out to be one based on magnetism: RuBee. Also known as the IEEE 1902.1 standard, RuBee uses totally passive tags and base stations that emit magnetic energy at very low levels. It has proven its worth around explosives and weapons inventory.
One company, Visible Assets, has made a business of licensing RuBee base stations and tags for hazardous environments, such as around weapons and explosives. The US Navy has already certified the use of RuBee for Hazards of Electromagnetic Radiation to Ordnance (HERO) applications involving sensitive explosive devices. The RuBee base stations operate at about 0.131 MHz with only 40 nW of transmitted energy. For more, click here.