消聲水池中彈性球回聲的測量與標定

唐俊 王同慶 徐百坤
北京航空航天大學能源與動力工程學院,北京100083

摘　要:在消聲水池中對直徑范圍為2cm～5cm的鋼球進行了回聲測量。對長脈沖和短脈沖入射聲信號的回聲信號進行了分析比較。研究了目標的彈性作用在這兩種情況下對回聲的影響。通過對標準鋼球回聲測量結果與解析計算結果的比較．檢驗了消聲水池目標回聲測量的精度，并為其他非標準目標回聲測量提供對比標定的依據。[著者文摘]

關鍵詞:消聲水池 彈性球 回聲 脈沖

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

嗯，好東西，頂，學習中

在以水為媒質的聲學測量中，有時采用不銹鋼制作的剛性球作為回波強度參照，比如超聲多普勒胎兒心率檢測儀綜合靈敏度檢測所用的系統中。但與反射強弱相聯系的，并不是球體材料的力學參數如彈性模量等，而是聲特性阻抗及直徑與聲波波長比值。故轉載到本論壇的這篇文章，立論是值得商榷的。

真正好資料，認真學習中。