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A tuned capacitive detector for high frequency vibrations

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A new apparatus for studying the longitudinal vibrations of plates in the megacycle range has been developed using an electrostatic drive and detector. The mechanical vibrations are converted to an a-c signal by means of a d-c polarising voltage applied to the probe as is normally done for electrostatic microphones.

The detection circuit is tuned on the vibration frequency; in this way a high sensitivity has been obtained. Detailed information is given on the circuitry and on upper frequency limits for the application of the apparatus in the measurement of the mechanical properties of plates.

Experimental data are given on the longitudinal sound velocity spectra, on the damping of various plates and on their dependence on temperature.
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Document Type: Research Article

Publication date: January 1, 1958

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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