Search results
Results from the WOW.Com Content Network
Asdic was the British version of sonar developed at the end of World War I based on the work of French physicist Paul Langevin and Russian engineer M. Constantin Chilowsky. The system was developed as a means to detect and locate submarines by their reflection of sound waves.
The US Army also used sound locators. [14] US Army sound ranging units took part in nearly all battles in which the army participated after November 1942. By the end of the war there were 25 observation battalions with 13,000 men. [15] During the Okinawa campaign, the US Army used its sound ranging sets to provide effective counter battery fire ...
The Maltese sound mirror is known locally as "the ear" . The Dungeness mirrors, known colloquially as the "listening ears", consist of three large concrete reflectors built in the 1920s–1930s.
Swedish soldiers operating an acoustic locator in 1940. Acoustic location is a method of determining the position of an object or sound source by using sound waves. Location can take place in gases (such as the atmosphere), liquids (such as water), and in solids (such as in the earth).
Geophysical MASINT is a branch of Measurement and Signature Intelligence (MASINT) that involves phenomena transmitted through the earth (ground, water, atmosphere) and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and magnetic field or ionosphere disturbances.
Radar is the most recently developed means of locating hostile artillery. The emergence of indirect fire in World War I saw the development of sound ranging, flash spotting and aerial reconnaissance, both visual and photographic. Radars, like sound ranging and flash spotting, require hostile guns, etc., to fire before they can be located.
For army infrasound applications, the target frequency range was in the 1–20 Hz band. [3] Infrasound has the ability to reach distances of 100–500 km. There are natural sources of infrasound emissions, such as avalanches, tornados, volcanoes, earthquakes and man-made sources of infrasound, such as aircraft engines, helicopters, artillery ...
Countermeasures by the British included sound detection equipment, searchlights and anti-aircraft artillery, followed by night fighters in 1915. One tactic used early in the war, when their limited range meant the airships had to fly from forward bases and the only zeppelin production facilities were in Friedrichshafen , was the bombing of ...