Primary calibration in acoustics metrology

7th Brazilian Congress on Metrology

Bacelar Milhomem, T.A.^1 ; Defilippo Soares, Z.M.^1

Inmetro, Duque de Caxias, Rio de Janeiro, Brazil^1

关键词: Diffuse fields;    Free fields;    Key comparison;    Laboratory standard microphone;    National metrology institutes;    Pressure field;    Reciprocity calibration;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/575/1/012008/pdf
DOI  :  10.1088/1742-6596/575/1/012008

来源: IOP

【 摘 要 】

SI unit in acoustics is realized by the reciprocity calibrations of laboratory standard microphones in pressure field, free field and diffuse field. Calibrations in pressure field and in free field are already consolidated and the Inmetro already done them. Calibration in diffuse field is not yet consolidated, however, some national metrology institutes, including Inmetro, are conducting researches on this subject. This paper presents the reciprocity calibration, the results of Inmetro in recent key comparisons and the research that is being developed for the implementation of reciprocity calibration in diffuse field.