表 1L1(cm)L2(cm)t1(s)t2(s)V= （ L2-L1 ） /(t2-t1)(m/s)V声118.00021.000593692303.030222.00023.000692721344.828326.00027.000816847322.581323.051431.00033.0009551020307.692538.00040.00011721238303.030644.00047.00013561440357.143表2：动态法nVr(cm/s)f左 (HZ)f右 (HZ)△ f=(f 左 -f右 )/2V声 =f0*Vr/ △ f(m/s)V声 (m/s)15.937006369936.50335.8526.837007369927.50335.4737.837008369918.50339.5348.737009369909.50338.8459.7370103698910.50341.81339.11610.6370113698811.50341.04711.5370123698712.50340.40812.4370133698613.50339.85913.3370143698514.50339.381014.2370153698415.50338.97表3次数相位差x1x2△x12π46.80547.7450.94022π48.68049.6000.92032π48.20049.1400.94042π50.10051.0500.95052π41.20042.1300.930动态发测声速37016370143701237010左37008动态发点画图f37006370043700237000Vr37016370143701237010左 37008 f37006370043700237000动态发拟合线动态发拟合线Vr。