铑自给能探测器延迟信号数字处理算法与实验研究

Experimental Research on Digital Processing Algorithm for RSPND Delay Signal

铑自给能探测器(RSPND)输出电流信号的慢响应特性严重影响反应堆内中子注量率的实时测量,不利于反应堆的控制和安全管理。采用反函数计算或各种补偿方法改进其响应特性,有利于RSPND的使用。本文研究了前向差分变换法、后向差分变换法、阶跃响应不变法及双线性变换法等4种数字处理算法,有效缩短了铑自给能探测器输出信号的响应时间,时间常数缩短到5s以内。通过数字实验系统,验证了算法的正确性,为该探测器用于反应堆内中子注量率测量的快速响应提供了可行性。

The slow response characteristics of output current signal of rhodium self-powered neutron detectors (RSPND) has seriously affected the real-time response of the neutron flux rate measurement in the reactor, which is not conducive to real-time control and safety management of reactor. Inverse function calculation or various compensation methods are used to improve the response characteristics of RSPND, which is beneficial for the application of RSPND. This paper studies the forward differential transform method, backward differential transform method, step response method and bilinear transform method of four kinds of digital processing algorithms, and the response time for the output signal of the vanadium self-powered neutron detector is shortened effectively. The time constant is reduced to less than 5 seconds. The digital experimental system verifies the correctness of the algorithm, which provides the possibility for the rapid response of rhodium self-powered neutron detectors in the measurement the neutron flux rate in the reactor.