L波段三维ESR成像系统的研制(Ⅲ)——L波段谐振腔的研制  

DEVELOPMENT OF L-BAND THREE DIMENSIONAL ESR IMAGING SYSTEM(Ⅲ)——Development of L Band Resonator

作　　者：郑莹光[1] 董凤霞[1] 许静[2] 徐玉书[2] 沈尔中[3] 吴可[4] 丛建波[4] 张东日[5] 

机构地区：[1]吉林大学分析测试中心,吉林长春130023 [2]吉林大学原子与分子物理研究所,吉林长春130023 [3]吉林大学理论化学研究所,吉林长春130023 [4]军事医学科学院放射医学研究所,北京100850 [5]延边大学物理系,吉林延吉133002

出　　处：《波谱学杂志》2003年第3期231-237,共7页Chinese Journal of Magnetic Resonance

基　　金：国家自然科学基金重点资助项目 ( 2 993 5 0 80 )

摘　　要：描述了一个用于生物样品L波段ESR成像用的谐振腔 ,讨论了在制作、设计过程中几个值得注意的问题 ,该腔为 3 环 2 裂缝再进入式谐振腔 ,可检测直径为 2 0mm长 30mm的H2 O样品 .空腔的共振频率为 1 .0 5GHz.腔的Q值是样品中水含量的函数 ,无载Q大于1 0 0 0 .用插入侧臂的耦合环得到谐振腔与微波桥之间的匹配 ,确定了耦合环直径的最佳值 ,对无载腔其值约为腔臂直径的 1 /3,而对有载腔其值约等于腔臂的直径 .This paper describes the development of an L band resonator for ESR imaging, some problems encountered in the process of designing and manufacturing are discussed. The resonator is a 3 loop 2 gap re entrant resonator with a physical size that can accommodate H\-2O samples up to 20 mm in diameter and 30 mm in length. The resonance frequency of the unloaded resonator was 1.05 GHz. The Q factors of the resonator were measured under different sample (water) loading. The Q factor for the empty resonator was greater than 1 000. Matching between the resonator and the microwave bridge was obtained with a coupling loop inserted in one of the two lateral arms. The optimal diameter of the coupling loop was determined experimentally. For the unloaded cavity this value was about one third of the arm diameter, while for the loaded cavity it was nearly equal to that of the cavity arm. Using this resonator, we obtained the spatial distribution of TEMPO (2,2,6,6 tetramethylpiperidine 1 oxyl) nitroxide radicals in a sample tube.

关 键 词：L波段 三维ESR成像系统 研制 谐振腔 耦合环 氮氧自由基 TEMPO 电子自旋共振 生物医学工程 

分 类 号：O482.53[理学—固体物理] R445.2[理学—物理]