The Development of a Microphone Calibration Technique Using Laser Doppler Anemometry
Abstract:The details of a working system for the calibration of microphones based on the direct measurement of acoustic particle velocity using Laser Doppler Anemometry (LDA) are presented and discussed. The calibration is carried out using a standing wave generated inside a glass tube attached to a loudspeaker. The probe microphone used to monitor pressure amplitude is fitted in the end of the tube. The pressure amplitude at the end is calculated from velocity measurements using the LDA system and the characteristic acoustic impedance of the air inside the tube. The frequency response of the probe is characterized separately. A measurement microphone system supplied by the National Physical Laboratory (NPL) has been calibrated using this apparatus. The sensitivity of the microphone is determined to within ±0.1 dB of the sensitivity obtained by reciprocity calibration for frequencies between 600 Hz and 2 kHz.
Document Type: Research Article
Publication date: January 1, 2002
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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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