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本文研制成功一种冻土测试用 ５００ ｋＨｚ纵波、横波 １－３、２－２复合宽带换能器．其灵敏度高、频带宽，声阻抗低，很适于冻土力学特性测试．文中介绍了换能器的结构及相应测试系统特性，并仅以１０ｐｓ的延时时间和在零度以下气温的条件下，实测了多种含水量冻结兰州黄土试块的纵、横波声速．
This paper successfully developed a frozen earth test with 500 kHz longitudinal wave, shear wave 1-3,2-2 composite broadband transducer. Its high sensitivity, frequency bandwidth, low acoustic impedance, it is suitable for testing the mechanical properties of frozen soil. In this paper, the structure of the transducer and the characteristics of the corresponding testing system are introduced. The longitudinal and transverse shear wave velocities of frozen Lanzhou loess blocks with various water contents are measured under the condition of 10 ps delay time and under the subzero temperature.