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However, in non-contact ultrasound, ambient air is the only acoustic coupling medium. An electromagnetic acoustic transducer (EMAT), is a type of non-contact ultrasound that generates an ultrasonic pulse which reflects off the sample and induces an electric current in the receiver. This is interpreted by software and provides clues about the ...
A curvilinear array ultrasonic transducer for use in medical ultrasonography Inside construction of a Philips C5-2 128 element curved array ultrasound sensor. Ultrasonic transducers and ultrasonic sensors are devices that generate or sense ultrasound energy. They can be divided into three broad categories: transmitters, receivers and transceivers.
1 16 48,000 Windows Sound System compatible, Gravis Ultrasound card [97] Drucegrove Digitalker MM54104 1980 1 1 13,000 Namco Galaxian (King & Balloon) and Scorpion arcade system boards, National Semiconductor Digitalker DT1050 speech synthesizer: Delta modulation (DM) differential PCM (DPCM) speech synthesis chip [98] [99] Gravis: GF1 1992 32 ...
The twin-turboprop, high-wing aircraft has a retractable gear and came in two variants: the initial N22, followed by the stretched N24. Supported by the Australian Government, design work began in the mid-1960s, and it made its maiden flight on 23 July 1971. Despite some export sales and commercial operations, sales were not sufficient and ...
Reflected ultrasound comes from an interface, such as the back wall of the object or from an imperfection within the object. The diagnostic machine displays these results in the form of a signal with an amplitude representing the intensity of the reflection and the distance, representing the arrival time of the reflection.
This depth reduces with the increase of AC frequency, the material conductivity, and permeability. Typically for 1 MHz AC excitation, the skin depth is only a fraction of a millimeter for primary metals like steel, copper and aluminum. The eddy current in the magnetic field experiences Lorentz force. In a microscopic view, the Lorentz force is ...
Acousto-optics is a branch of physics that studies the interactions between sound waves and light waves, especially the diffraction of laser light by ultrasound (or sound in general) through an ultrasonic grating. A diffraction image showing the acousto-optic effect.
A specification often refers to a set of documented requirements to be satisfied by a material, design, product, or service. [1] A specification is often a type of technical standard. There are different types of technical or engineering specifications (specs), and the term is used differently in different technical contexts.