逆动态方法的改进与验证  

Improvement and Verification of Inverse Kinetics Method

作　　者：吕炜枫[1] 李富[1] 周旭华[1] 颜见秋[1] 王登营[1] 位金锋[1] 郭炯[1] 

机构地区：[1]清华大学核研院,北京100084

出　　处：《核电子学与探测技术》2010年第1期34-38,共5页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金资助项目(10675071)

摘　　要：逆动态方法是一种有效的实时反应性测量方法,此方法实现的关键是准确地计算中子信号的导数和积分,导数对于测量信号中的噪声很敏感,而噪声是不可避免的。论文研究了几种降低噪声影响的方法,包括低通滤波器和平滑样条函数的方法,并进行了数值仿真,证明平滑样条函数能有效地消除测量信号中的噪声,直至5%信噪比的信号都能取得较好的结果,并且不产生延迟。因此,消除噪声的算法是逆动态方法实现的一个关键基础,平滑样条函数是一个较好的选择。Inverse Kinetics Method is an effective online reactivity measurements method. The key issue of the Inverse Kinetics Method is how to calculate the derivative and integral of the neutron signal accurately. The derivative of the neutron signal is very sensitive to random noise which can not be avoided in measurement. Several methods which can restrain noise are presented and numerically simulated, including digital filter and cubic smoothing splines. As shown from the numerical simulation, cubic smoothing splines can restrain the noise in the neutron signal, even for the signal noise ratio of 5 %, without the delay effect normally existed in digital filter. Therefore, treatment of the noise in the neutron signal is the key issue for the inverse kinetics method, and cubic smoothing splines is a good choice.

关 键 词：逆动态法 平滑样条函数 数字滤波器 

分 类 号：TL3[核科学技术—核技术及应用]