消声水池中弹性球回声的测量与标定

兑水

唐俊 王同庆 徐百坤
北京航空航天大学能源与动力工程学院,北京100083

摘　要:在消声水池中对直径范围为2cm～5cm的钢球进行了回声测量。对长脉冲和短脉冲入射声信号的回声信号进行了分析比较。研究了目标的弹性作用在这两种情况下对回声的影响。通过对标准钢球回声测量结果与解析计算结果的比较．检验了消声水池目标回声测量的精度，并为其他非标准目标回声测量提供对比标定的依据。[著者文摘]

关键词:消声水池 弹性球 回声 脉冲

Acoustic reflection measurements and calibration of elastic spheres in an anechoic tankTANG Jun, WANG Tong-qing, XU Bai-kun School of Jet Propulsion, Beijing University of Aeronautics ＆ Astronautics, Beijing 100083, ChinaAbstract:Acoustic reflection measurements of steel spheres between 2 and 5 centimeter in diameter have been made in an anechoic tank. Reflected acoustic signals from the targets, using long and short pulses respectively, are analyzed and compared. The influence of the acoustic reflection on the elastic factor of the targets under the two conditions is studied. Accuracy of the target reflection measurement in the anechoic tank has been verified by comparing the measured values of standard steel spheres with theoretically calculated values. Calibration reference is supplied for acoustic reflection measurement of the nonstandard targets.[著者文摘]

Key words:anechoic tank; elastic sphere; acoustic reflection; pulse

mjh4088

嗯，好东西，顶，学习中

牛凤岐

在以水为媒质的声学测量中，有时采用不锈钢制作的刚性球作为回波强度参照，比如超声多普勒胎儿心率检测仪综合灵敏度检测所用的系统中。但与反射强弱相联系的，并不是球体材料的力学参数如弹性模量等，而是声特性阻抗及直径与声波波长比值。故转载到本论坛的这篇文章，立论是值得商榷的。

zsxlh

真正好资料，认真学习中。