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Acoustic harassment and acoustic deterrents are technologies used to keep animals [1] and in some cases humans away from an area. Applications of the technology are used to keep marine mammals away from aquaculture facilities and to keep birds away from certain areas (for instance in the vicinity of airports and blueberry fields).
Sounds include predator cries and distress calls of a variety of birds to discourage pest birds from coming into an area. Common locations for these devices include vineyards, reclamation plants, airports, and other open areas. There are also ultrasonic avian deterrents, which are inaudible to human ears. [2] Ultrasonic bird repeller, 2008
Ultrasonic devices are static sound-emitting bird deterrents, which, in theory, will annoy birds to keep them away from enclosed or semi-enclosed areas. Ultrasonic scarers are not harmful to birds, however, there is debate around birds' ability to hear these frequencies at loud enough decibels.
Scarecrow in a field Rat guards: steel or aluminum discs attached to the mooring line to prevent rats from boarding a ship Ultrasonic bird repeller. An animal repellent consists of any object or method made with the intention of keeping animals away from personal items as well as food, plants or yourself.
A statistical survey into customer satisfaction levels with ultrasonic deterrents concluded that 80% of owners expressed satisfaction with the results of ultrasonic deterrent devices. [ 3 ] The Royal Society for the Protection of Birds (RSPB), has endorsed a commercial product called "CatWATCH", [ 4 ] for which it receives 2% of the wholesale ...
Electronic pest control is the name given to any of several types of electrically powered devices designed to repel or eliminate pests, usually rodents or insects. Since these devices are not regulated under the Federal Insecticide, Fungicide, and Rodenticide Act in the United States, the EPA does not require the same kind of efficacy testing that it does for chemical pesticides.
The potential for ultrasonic imaging of objects, in which a 3 GHz sound wave could produce resolution comparable to an optical image, was recognized by Sergei Sokolov in 1939. Such frequencies were not possible at the time, and what technology did exist produced relatively low-contrast images with poor sensitivity. [ 34 ]
Acoustic resonance technology (ART) is an acoustic inspection technology developed by Det Norske Veritas over the past 20 years. ART exploits the phenomenon of half-wave resonance, whereby a suitably excited resonant target (such as a pipeline wall) exhibits longitudinal resonances at certain frequencies characteristic of the target's thickness.