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A thin-film bulk acoustic resonator (FBAR or TFBAR) is a device consisting of a piezoelectric material manufactured by thin film methods between two conductive – typically metallic – electrodes and acoustically isolated from the surrounding medium. The operation is based on the piezoelectricity of the piezolayer between the electrodes.
In some devices, a mechanical absorber or reflector is added between the IDTs and the edges of the substrate to prevent interference patterns or reduce insertion losses, respectively. The acoustic wave travels across the surface of the device substrate to the other interdigitated transducer, converting the wave back into an electric signal by ...
Vibroacoustic therapy (VAT) is a type of sound therapy that involves passing low frequency sine wave vibrations into the body via a device with embedded speakers. [ 1 ] [ 2 ] This therapy was developed in Norway by Olav Skille in the 1980s. [ 3 ]
Collecting from both ears simultaneously requires a two-channel pre-amplifier. Single channel recordings can detect activity from a binaural presentation. A common reference electrode may be located at the nape of the neck. Transducers can be earphones, headphones, a bone oscillator, or sound field. It is preferable for the patient to be asleep.
Silicon electrodes are alloy electrodes doped with silicon and an insulating glass cover layer. Silicon technology provides better mechanical stiffness and is a good supporting carrier to allow for multiple recording sites on a single electrode. [31] Tungsten electrodes are very rugged and provide very stable recordings. This allows ...
The arrayed electrode was also demonstrated to perform well compared to silver/silver chloride electrodes. The device consisted of four sites of sensors with integrated electronics to reduce noise by impedance matching. The advantages of such electrodes are: (1) no electrolyte used, (2) no skin preparation, (3) significantly reduced sensor size ...