在对检漏工作实际需求分析的基础上,设计并实现了一种高性能实用电子听漏仪。该听漏仪综合应用了提高信噪比、提高放大电路增益、截断高频有害噪声、在功放级电路设置反馈等多项技术,在提高听音分辨力的同时,使得听音分辨力和抑制噪声达到较好的平衡。此外,微控制器控制的带通滤波器实现了在常见泄漏声信号的频段之间切换。仿真结果显示:带通滤波器的输出符合设计指标;样机测试表明:听漏仪的听音分辨力好,听音噪声得到了有效抑制,达到了用户提出的设计要求。

 

A leakage listening detector with high performance and practicality is designed and developed based on the practical requirement from leakage detecting.Several functional parts such as JFET follower,high gain preamplifier,low pass filter and feedback circuit are integrated into the detector to both improve listening recognition and achieve a appreciable balance between listening recognition and noise suppression.Band pass filter(BPF) under the control of MCU can easily switch among the common-used frequency...