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| Study of the Influencing Factors in the High-frequency Hydrophone Calibration Based on the Two-transducer Reciprocity Method |
| YANG Ping1,FENG Yan-qiang2,ZHU Hai-jiang2 |
1.National Institute of Metrology, Beijing 100013, China
2.School of Information and Technology, Beijing University of Chemical Technology, Beijing 100029, China |
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Abstract Two-transducer reciprocity method is one of the primary method for high-frequency hydrophone calibration because of its dependence only on electric quantities. Several factors are studied except the electric quantities, such as the effective radius of the auxiliary transducer, acoustic field symmetry, soaking time, oxygen content and attenuation correction. Experiment shows that, if the diffraction value G1 and averaging factor G2 is calculated precisely, the effective radius and attenuation correction will introduce rather large uncertainties, the influence of field symmetry, soaking time and oxygen content can be neglected. Experiment data show that, the calibration results between 0.5～15 MHz are very close to the results of NPL by laser methods.
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2012, Vol. 33 
