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There are contradictions in Oohashi's results. [3] [12]No effect was detected on listeners in the Oohashi study when only the ultrasonic (frequencies higher than 24 kHz) portion of the test material was played for test subjects.
A long-range acoustic device in use on the USS Blue Ridge Sonic and ultrasonic weapons ( USW ) are weapons of various types that use sound to injure or incapacitate an opponent. Some sonic weapons make a focused beam of sound or of ultrasound ; others produce an area field of sound.
Ultrasound can also provide additional information such as the depth of flaws in a welded joint. Ultrasonic inspection has progressed from manual methods to computerized systems that automate much of the process. An ultrasonic test of a joint can identify the existence of flaws, measure their size, and identify their location.
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 device simply starts working when it's plugged in. “The most common feedback we get is improved sleep, more energy levels, fewer headaches, and less brain fog," says Somavedic CEO Juraj Kocar.
In Canada, various federal acts govern non-ionizing radiation by originating source, such as the Radiation Emitting Devices Act, the Canada Consumer Product Safety Act, and the Radiocommunication Act. [56] For situations not under federal jurisdiction, Canadian provinces individually set regulations around use of non-ionizing radiation. [57]
A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...
The measurements can be made with non-contact sensors such as microphones, radar, ultrasonic devices and laser Doppler vibrometers. [115] A landmine has a distinctive acoustic signature because it is a container.