聲sheng脈mai衝chong從cong發fa射she換huan能neng器qi發fa出chu
，通tong過guo耦ou合he水shui到dao達da水shui和he聲sheng測ce管guan管guan壁bi的de界jie麵mian，再zai通tong過guo管guan壁bi到dao達da聲sheng測ce管guan管guan壁bi與yu混hun凝ning土tu的de界jie麵mian
，穿chuan過guo混hun凝ning土tu後hou又you需xu穿chuan過guo另ling一yi聲sheng測ce管guan的de兩liang個ge界jie麵mian而er到dao達da接jie收shou換huan能neng器qi。

因此
，聲測管形成4個界麵，每個界麵的聲能透過係數可按下式計算：

式中：

——某界麵的聲能透過係數
；

——界麵兩側介質的聲阻抗率

發射和接收換能器之間4個界麵的總透聲係數為

shengzukanglvjiaodi，yongzuoshengceguanjuyoujiaodadetoushenglv
，tongchangkeyongyujiaoxiaodeguanzhuzhuang
，zaidaxingguanzhuzhuangzhongshiyongshiyingshenzhong
，yinweidazhijingzhuangxuguanzhudalianghunningtu
，shuinideshuihuarebuyifasan：鑒jian於yu塑su料liao的de熱re膨peng脹zhang係xi數shu與yu混hun凝ning土tu的de相xiang差cha懸xuan殊shu

，混hun凝ning土tu凝ning固gu後hou塑su料liao管guan因yin溫wen度du下xia降jiang而er產chan生sheng徑jing向xiang和he縱zong向xiang收shou縮suo，有you可ke能neng使shi之zhi與yu混hun凝ning土tu局ju部bu脫tuo開kai而er造zao成cheng空kong氣qi或huo水shui的de夾jia縫feng，在zai聲sheng通tong路lu上shang又you增zeng加jia了le更geng多duo反fan射she強qiang烈lie的de界jie麵mian，容rong易yi造zao成cheng誤wu判pan。

聲測管的直徑，通常比徑向換能器的直徑大l0mm即可，常用規格是內徑50-60mm。guanzidebihouduitoushenglvdeyingxianghenxiao，suoyi
，yuanzeshangduiguanbihoudubuzuoxianzhi，dancongjieshengyonggangliangdejiaodueryan，guanbizhiyaonengchengshouxinjiaohunningtudeceyali，zeyueboyuesheng。