Uncertainty analysis for pressure sensitivities of laboratory standard microphones
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概要
- 論文の詳細を見る
Pressure sensitivities of laboratory standard microphones are acoustic standards required for precise measurement in the audible frequency range. The National Metrology Institute of Japan (NMIJ) has developed a pressure calibration system that enabled absolute calibration of pressure sensitivities. In this study, we analyzed the measurement uncertainty of pressure sensitivities calibrated at NMIJ in detail by using the pressure sensitivity formula and examining every possible component that contributed to the uncertainty. The analysis revealed several dominant components, such as repeatability in the measurement of the voltage transfer function, cavity volume of the coupler, capillary tube correction factor, and instability of the microphone. Within a frequency range in which the expanded uncertainty was constant, the expanded uncertainty (coverage factor k = 2) was 0.04 dB for Bruel & Kjaer 4160, a type LS1P microphone, and 0.09 dB for Bruel & Kjaer 4180, a type LS2aP microphone.
- 社団法人日本音響学会の論文
著者
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Horiuchi Ryuzo
National Metrology Institute Of Japan Aist
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Fujimori T
National Metrology Institute Of Japan Aist
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Fujimori Takeshi
National Institute Of Advanced Industrial Science And Technology Tsukuba Central 2
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SATO Sojun
National Institute of Advanced Industrial Science and Technology
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Sato S
National Metrology Institute Of Japan Aist
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