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Étude de microphones pour niveaux très élevés étalonnage par tube à choc et analyse mécanographique des résultats

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Piezo-electric or capacitance microphones have been designed for studies of very intense noise (as far as 180 dB) or of aerodynamic pressure over a wide spectrum (such as supersonic shock waves). The characteristics of the main microphones built are summarized.

The frequency calibration of these pressure pick up, which are microphones of small sensitivity, is no longer possible by the usual acoustical methods because it is difficult to obtain sinusoidal pressures strong enough. This calibration is possible by means of unit pressure steps such as those obtained with a shock tube.

The principle of this method is recalled and then the equipment and the processing mode are described. A curve reader is used to obtain the ordinates on a perforated tape. The transfer function looked for, defined as the ratio of the Fourier's transforms of the input pressure p(t) and of the response of the microphone as a function of time, is obtained by means of digital computers.
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Document Type: Research Article

Publication date: January 1, 1964

More about this publication?
  • 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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