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本文主要介绍漏水声拾取装置中增益达８０ｄＢ的低噪声前置放大器的设计与调试，并简要介绍压电式传感器的原理及结构。
This article mainly introduces the design and debugging of the low noise preamplifier with the gain of up to 80dB in the leaking sound pickup device, and briefly introduces the principle and structure of the piezoelectric sensor.