聲測管zhuyaoyongyushengbotoushefajiancezhuangjizhiliang，qizhongchaoshengbofashetantouhejieshoutantoufenbiexiaruyuxianmaishezaizhuangshenzhongbingchongshuidebutonggangguanzhong。fashetantouchanshengdechaoshengbotongguoshuiouhechuantouzhuangshenhunningtu
，daodalingyigengangguanzhongdejieshoutantou。jieshoutantoujiangjieshoudaodexinxichuanshudaoyiqizhong
，tongguozonghefenxijieshoudaodechaoshengbozaihunningtuzhongdeshengsu、聲幅、頻率、波形等特征來評價樁身混凝土的質量。

  shengbotoushefadeyuanlishiyouchaoshengbofasheqifashechaoshengbo，genjujieshouqijieshoudaochaoshengbodeshijianchajiukeyizhidaojuli。zheleisiyuleidacejudeyuanli。chaoshengbofasheqixiangmougefangxiangfashechaoshengbo，zaifasheshijiandetongshikaishijishi。chaoshengbozaikongqizhongchuanbo，tuzhongpengdaozhangaiwu，jiulikehuilai。chaoshengbojieshouqizaijieshoudaofanshebohoulijitingzhijishi。(超聲波在空氣中的傳播速度為340m/s
，發射點到障礙物的距離(s)可根據計時器記錄的時間T計算得出

，即s=340t/2)

如何判斷樁基的質量

  當混凝土中存在缺陷時，在超聲波發射和接收路徑上形成不連續介質，低頻超聲波會繞過缺陷向前傳播。在檢測距離內，其衍射所需的“聲時”比超聲波在無缺陷的混凝土中直接傳播所需的“聲時”要長，反映了超聲波速度的降低。

  其qi次ci，當dang存cun在zai缺que陷xian時shi，超chao聲sheng波bo在zai混hun凝ning土tu中zhong傳chuan播bo時shi，聲sheng能neng的de衰shuai減jian增zeng大da，接jie收shou信xin號hao的de首shou波bo振zhen幅fu減jian小xiao。第di三san
，當dang混hun凝ning土tu存cun在zai缺que陷xian時shi，高gao頻pin成cheng分fen比bi低di頻pin成cheng分fen消xiao失shi得de快kuai，接jie收shou信xin號hao的de頻pin率lv總zong是shi低di於yu相xiang同tong距ju離li測ce量liang的de無wu缺que陷xian混hun凝ning土tu。