The Development of a Microphone Calibration Technique Using Photon Correlation Spectroscopy
Laser Doppler Anemometry (LDA) measurements of acoustic particle velocity, utilizing the photon correlation method of signal processing, provide the basis for a working microphone calibration system. The calibration is performed using a standing wave generated inside a glass tube attached to a loudspeaker. From the photon correlation LDA velocity measurement and a knowledge of the characteristic acoustic impedance of the air inside the tube, the pressure amplitude at the end is calculated. The frequency response of a probe microphone fitted in the end of the tube is characterized separately, relative to a measurement microphone system supplied by the National Physical Laboratory (NPL). The LDA apparatus has been used to calibrate the measurement microphone system. For frequencies between 600 Hz and 2 kHz, the sensitivity of the microphone is determined to within ±0.2 dB of the sensitivity obtained by reciprocity calibration. While this is not state-of-the-art in terms of microphone calibration, it marks the first stage of an on-going project to establish the next generation of primary standards for sound pressure. Further work will be conducted with the emphasis on free-field measurements.
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Document Type: Research Article
Publication date: March 1, 2003
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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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