| 冻土纵、横波宽带超声换能器的研制 |
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| 引用本文： | 彭万巍,袁易全.冻土纵、横波宽带超声换能器的研制[J].冰川冻土,2000,22(1):85-89. |
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| 作者姓名： | 彭万巍 袁易全 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室!甘肃兰州730000(彭万巍)，东南大学无线电系!江苏南京210096(袁易全) |
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| 摘 要： | 根据冻土弹性波测试的要求，研制了一种冻土测试用的５００ＫＨz纵横波复合宽带超声换 能哭喊 。其性能具有灵敏度高、频带宽、声阻撤低的特点，适用于冻土力学特笥的测试。文章介绍了它的结构及相应系统特性，并以１０ｐｓ的延时时间精度，在零度以下气温条件下，实测了不同含水量及负温冻结兰州黄土试块的纵、横波速，获得了好的结果。
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| 关 键 词： | 冻土 宽带换能器 纵波声速 横波声速 |
Developing of a Broadband Ultrasonic Transducer for Frozen Soils |
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| PENG Wan-wei,YUAN Yi-quan.Developing of a Broadband Ultrasonic Transducer for Frozen Soils[J].Journal of Glaciology and Geocryology,2000,22(1):85-89. |
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| Authors: | PENG Wan-wei YUAN Yi-quan |
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| Abstract: | The authors have developed succeedly a kind of 500 kHz 1-3 composite broadband ultrasonic transducer used for measuring longitudinal wave and transverse wave in frozen soils. The ultrasonic trans- ducer has the characteristics of highest sensitivity; wide frenquency-band and lower sonic impedance. It is suitable for measuring mechanical properties of frozen soils. The configuration, the corresponding characteristics and testing results are presented in this paper. The longitudinal wave and transverse wave ve- locities of frozen Lanzhou leoss are measured under various water contents (7%-25%) and temperatures (-2-20℃) using this system, and the measuring pre- cision is within 10 ps. |
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| Keywords: | frozen soils broadband transducers longitudinal wave velocity transverse v-ave velocity |
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