【摘要】 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．更多还原

【Abstract】 This paper developed a kind of 500 kHz 1-3 composite ultrasonic transducer used for frozen sand testing by longitudinal and transverse wave. Its sensitivity is high, frenquency-band is wide and sound-impedance is low. It’s very suitable to use this transducer for measuring mechanics characteristics of frozen sand. This paper introduce its structure, properties, and testing result, i. e. longitudinal and transverse ultrasonic wave velocity of Lanzhou frozen loessic block with unfrozen water contents under air temperature below O℃, for delay time of 70 ps.更多还原