基于裂变偶的瞬态温升传感器技术研究

Researching of Transient Temperature Sensor Based on Fission-couples

针对快中子脉冲堆CFBR-Ⅱ的瞬态温度动态诊断的难题,从分析瞬变温度场中子致热的原理出发,利用裂变材料作为热偶接点,设计了以裂变偶作为传感元件的瞬变温度测量传感器。设计中选用裂变珠直径约为1 mm,细热偶丝的直径约为0.05 mm。通过一系列技术措施,解决了裂变偶的制作工艺,实现了对裂变偶输出微弱信号的线性放大,并以Labview为开发平台,通过一系列实验获得了裂变偶在CFBR-Ⅱ堆超瞬发临界状态下的瞬态温升,观测到了裂变偶在CFBR-Ⅱ堆3个不同位置的瞬态温升-时间响应曲线。同时,针对裂变偶在瞬变辐射场下的热传导损失进行了理论估算,排除了热损失带来的测量误差。

Aiming at the technical problems of transient temperature measurement in transient neutron field , the paper presented a measurement system based on the fission -couples and Labview system which can measure and analyze the transient temperament directly on fast neutron critical assembly by fissile material heat .A series of experiments aimed at measuring the transient temperature have been implemented , and the primary results have been obtained by a series of methods , such as the welding of the fissile element in the sensing part of the detector and the designing of the linear amplifier .The temperature response curves of three different positions on CFBR-II have been observed with the size of the fissile element of 1 mm in diameter and the size of the fine wires of 0.05 mm in diameter.