Reaffirmation of measurement uncertainty in pressure sensitivity determination of LS2P microphones by reciprocity method |
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| Affiliation: | 1. Apex Level Standards and Industrial Metrology Division, CSIR-National Physical Laboratory, New Delhi 110 012, India;2. Dept. of Mechanical, Production & Industrial Engg., Delhi Technological University, Delhi 110 042, India;1. LNE, 29 avenue Roger Hennequin, 78197 Trappes, France;2. TOTAL, 2 place Jean Millier – La Défense 6, 92078 Paris La Défense, France;3. TENESOL, 12 allée du Levant, 69890 La Tour-de-Salvagny, France;1. Yildiz Technical University, Department of Mechanical Engineering, 34349 Besiktas, Istanbul, Turkey;2. Vienna University of Technology, Institute for Production Engineering and Laser Technology, Department of Interchangeable Manufacturing and Industrial Metrology, Karlsplatz 13/3113, A-1040 Wien, Austria;3. Istanbul Physical Medicine and Rehabilitation Training Hospital Istanbul, Orthopaedics and Traumatology Department, Turkey;4. Yildiz Technical University, Department of Mechatronics Engineering, 34349 Besiktas, Istanbul, Turkey;1. Department of Engineering Mechanics, Kaunas University of Technology, K. Donelaicio 73, LT-44244 Kaunas, Lithuania;2. Department of Engineering Mechanics, Kaunas University of Technology, A. Mickeviciaus 37, LT-44244 Kaunas, Lithuania;3. Department of System Analysis, Kaunas University of Technology Studentu 50-407, LT-51368 Kaunas, Lithuania;4. Department of Machine Engineering, Vilnius Gediminas Technical University, J. Basanaviciaus g. 28, LT-03224 Vilnius, Lithuania;5. Precizika-Metrology, Zirmunu g. 139, LT-09120 Vilnius, Lithuania;1. Department of Civil Engineering, Shantou University, Guangdong, PR China;2. The Key Lab of Digital Signal and Image Processing of Guangdong Province, Shantou University, Guangdong, PR China;3. Department of Information Management, National Taichung University of Technology, Taichung, Taiwan, ROC;1. Universidade de Évora, Centro de Geofísica de Évora, Instituto de Telecomunicações, Évora, Portugal;2. Universidade de Évora, Centro de Geofísica de Évora, Évora, Portugal;3. Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, Darmstadt, Germany;4. Instituto Superior Técnico, Universidade de Lisboa, Instituto de Telecomunicações, Lisboa, Portugal;1. Institute of Process Measurement and Sensor Technology, Ilmenau University of Technology, 98693 Ilmenau, Germany;2. Sartorius Weighing Technology GmbH, Göttingen, Germany |
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| Abstract: | The paper presents the accuracy and precision associated with realization of primary standard of sound using the reciprocity method. An experimental determination of the front cavity volume on Universal Measuring Machine has lead to reaffirmation of measurement uncertainty in pressure sensitivity determination to 0.04–0.15 dB in frequency range 31.5 Hz to 25 kHz. The reduced measurement uncertainty has also been validated from the results of the recent APMP Key comparison and also by comparison to the manufacturer’s value for LS2P microphones. The use of optical method for measuring the front cavity volume has refined the measurement methodology followed with adaptation of a self reliant, traceable and systematic measurement procedure in comparison to the earlier use of nominal values for sensitivity fitting exercise conducted on MP.EXE program. Consequently, the measurement uncertainty associated with the calibration of working standard microphones, multifunction acoustic calibrator and A-weighted sound pressure level measurements is also reduced. |
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| Keywords: | Reciprocity method Front cavity depth Front cavity volume LS2P microphones Sensitivity fitting exercise |
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