Primary calibration of measurement microphones in the world: state of art

8th Brazilian Congress on Metrology

Milhomem, T.A.B.^1 ; Soares, Z.M.D.^1

Electroacoustics Laboratory, Acoustics and Vibration Metrology Division, Directory of Scientific and Industrial Metrology Directory, National Institute of Metrology, Quality and Technology, Avenida Nossa Senhora das Gracas, 50, Predio 1, Xerém, Duque de Caxias

RJ

25.250-020, Brazil^1

关键词: Diffuse fields;    Free field conditions;    Free fields;    Pressure field;    Reverberant chambers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012054/pdf
DOI  :  10.1088/1742-6596/733/1/012054

来源: IOP

【 摘 要 】

This paper presents an overview of state of art of measurement microphones primary calibration in the world with emphasis on Brazil practices. Initially, pressure field calibration is summarized being discussed mainly the couplers used to create pressure field conditions. After that, free-field calibration is presented being commented especially the anechoic chambers used to create free-field conditions. Concluding, it is showed diffuse-field calibration that is being investigated. It is presented, in particular, the reverberant chambers used to create diffuse-field conditions.