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]