声音传感器辐照实验研究

在给定的剂量率点,对动圈式、电容式、硅微式声音传感器进行了大剂量辐照实验研究,观察传感器随总剂量增强时其输出信号的变化,分析辐射效应机理。结果表明：动圈式声音传感器耐辐照性能最强;硅微式声音传感器由于内部放大电路的静态工作点会在γ射线的影响下产生漂移,导致信号输出发生比较严重的失真;电容式声音传感器中用于电磁屏蔽的铝制外壳受到γ射线的影响会产生电荷累积效应,对信号引入较大的噪声。其研究结果对乏燃料后处理系统进行基于声信号的安全状态实时监测提供了支持,是后续故障分析诊断技术的应用的硬件保证。

Irradiation Experiments Research of Sound Sensors

The irradiation experiments of three types of sound sensors in a given dose rate points are researched,the change of output signal is observed,and the radiation effect mechanism is analyzed. The results show that the moving coil sound sensor has the highest resistant radiation performance in the three types of sound sensors. There is an integrated amplifier circuit in the MEMS piezoelectric film sound sensor interior,static working point will drift and serious distortion in output signal will be caused by gamma rays effect. The output signal of the condenser sound sensor is very small,impedance transformation,small signal amplification and electromagnetic interference shielding in normal condition need to be design. But in irradiation environment,due to the influence of gamma rays,the charge accumulation effect will be produced at the aluminum shell and the large noise will be brought into the signal. The safe state real-time monitoring based on sound signal of lack fuel reprocessing system will be supported in result of this research,it is the following-uphardware guarantee in the fault diagnose technology application.