ESR成像系统中的磁场扫描和数据采集

MAGNETIC FIELD SCANNING AND COLLECTION OF DATA FOR ELECTRON SPIN RESONANCE IMAGING SYSTEM

在电子自旋共振(Electron Spin Resonance缩写ESR)成像系统中,为了得到高质量的样品断层图像,必须采用高线性度、慢扫描、大幅度的扫描磁场。本文介绍了用软硬件结合的方法,使扫描磁场的线性度,扫描周期和幅度达到系统所需的要求。同时,还介绍了用计算机统一控制磁场扫描和数据采集,使磁场扫描和数据采集之间同步协调,以及在数据采集过程中,采用数据叠加与平均的方法,使信号噪声显著减小。

In order to obtain excellent tomographic image of samples, a scanning magnetic field with good linearity, long scanning time and large amplitude must be used in an electron spin resonance imaging system. In this paper a method has been presented, in which a combination of software and hardware is applied and good experimental results have been obtained. That the magnetic field scanning and collection of data are unitedly controlled by computer to make them synchronized, and that in collection of data first the data is added repeatedly then is averaged over them to make the noise reduced remarkably are also introduced.