Hydrophone spatial averaging corrections from 1-40 MHz
Hydrophone spatial averaging corrections from 1-40 MHz
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DOI：
10.1109/ultsym.2000.921646
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发表时间：
2000-10
期刊：
影响因子：
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通讯作者：
E. Radulescu;P. A. Lewin;A. Goldstein;Andrzej Nowicki
中科院分区：
文献类型：
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作者：
E. Radulescu;P. A. Lewin;A. Goldstein;Andrzej Nowicki
建立了空间平均模型，并在1-40 MHz频率范围内进行了实验验证。该模型适用于圆形几何聚焦源，考虑了水听器有限孔径的影响，并允许在参考水听器的有源元件与被测水听器的有源元件有显著差异时通过替换进行校准。在不同f数声源的焦平面内校准的超声水听器探头的有效直径范围为150-500个/splµ/m，直径小于参比水听器的探头的实验确定的绝对灵敏度高于真实水听器。该模型能够预测正确的灵敏度，总体不确定度为+1分贝。它现在被扩展到适用于40 MHz以上的频率和矩形声源。
The spatial averaging model was developed and experimentally verified in the frequency range 1-40 MHz. The model is applicable to focused sources of circular geometry, accounts for the effects of hydrophone finite aperture and allows calibration by substitution to be performed when the active elements of reference and tested hydrophone differ significantly. The effective diameters of the ultrasonic hydrophone probes calibrated in the focal plane of the sources with different f-numbers ranged from 150-500 /spl mu/m. The probes with diameters smaller than that of the reference hydrophone exhibited experimentally determined absolute sensitivity higher than the true one. The model was capable of predicting the correct sensitivity with an overall uncertainty of +1 dB. It is now being extended to be applicable to frequencies beyond 40 MHz and rectangular acoustic sources.