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Is sound that is lower in frequency than 20 Hz (hertz) or cycles per second, the "normal" limit of human hearing. Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. The ear is the primary organ for sensing infrasound, but at higher intensities it is possible to feel infrasound vibrations in various parts of the body.
The MB3a is an infrasound sensor developed by the CEA, following the MB2000 and MB2005 series, which allows the recording of very-low-frequency acoustic signals over a broad frequency band, with an excellent resolution and a large dynamic range.
Sensor engineering and signal processing for defense, intelligence, and national security including sensor engineering and signal processing for detect and track of unauthorized aircraft, acoustic sensing and sensor fusion for protection of forward operating base perimeters, sensor engineering and signal processing to detect and locate live weapons fire, infrasound sensing and signal processing to geolocate counter-fire, and more.