一、前言如果把X射线检测过程看作是一个测量系统,那么,对于任一测量系统来说,它的输出信息量和输入信息量的关系都取决于该系统的动态特性。其动态特性可用下式说明:输入信息量×测量系统数学式=输出信息量。为了建立测量系统的数学式,通常引入传递函数的概念。系统的传递函数就是初始条件为零时,输出信息量的拉氏变换式与输 I. INTRODUCTION If the X-ray inspection process is viewed as a measurement system, then the relationship between the amount of output information and the amount of input information for any measurement system depends on the dynamic characteristics of the system. Its dynamic characteristics can be described by the following formula: Input information × measurement system Mathematical formula = output information. In order to establish the mathematical formula of the measurement system, the concept of transfer function is usually introduced. The transfer function of the system is the Laplace transform and the output of the output information when the initial condition is zero