本文叙述了低频超声波检测仪的设计原理，电路分析，换能器结构并讨论了在混凝土，岩体中应用。
The design principle, circuit analysis, and transducer construction of the low frequency ultrasonic tester are described. The applications to testing concretes and rocks are discussed.
本文叙述了低频超声波检测仪的设计原理，电路分析，换能器结构并讨论了在混凝土，岩体中应用。
The design principle, circuit analysis, and transducer construction of the low frequency ultrasonic tester are described. The applications to testing concretes and rocks are discussed.
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