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On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser-photocell pair with a moving stream of smoke or vapor in the laser beam's path"). Sound pressure waves cause disturbances in the smoke that in ...
A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations.
With the new, mobile systems Towed Array Sensor System (TASS) and the Surveillance Towed Array Sensor System (SURTASS) entering the system, the SOSUS name was changed in 1984 to Integrated Undersea Surveillance System (IUSS) to reflect the change from bottom fixed systems alone. In 1990 officers were authorized to wear IUSS insignia.
Wright's examination led to development of a similar British system codenamed SATYR, used throughout the 1950s by the British, Americans, Canadians and Australians. There were later models of the device, some with more complex internal structure (the center post under the membrane attached to a helix, probably to increase the Q factor ).
Long-Range Reconnaissance and Observation System or LORROS is a sensor system developed by Elbit Systems to provide long-range daytime and night-time surveillance. The unit consists of Forward looking infrared (FLIR) and Charge-coupled device (CCD) image sensors. Optional components include eyesafe laser rangefinder, built-in compass and ...
The new Stalwart-class ocean surveillance ships had the first contract awarded on 26 September 1980 and were similar to the prototype ship, the Moana Wave. Initially the SURTASS system were passive, receiving only sonar systems. The array was towed miles behind the ships and were designed for long range detection of submarines.
China's video surveillance equipment maker Zhejiang Dahua Technology said that it and its subsidiaries have agreed to terminate or exit five projects they signed with local governments in China's ...
The system gained further in-service use when deployed in support of the International Peace Implementation Force in Bosnia. Total investment in Ptarmigan by mid-1992 was approaching £1 billion. In August 1993, a £22 million contract was awarded to modify the system to allow deployment over long distances with satellite links.
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