これで,RFコイルとキャパシタが揃いましたので,同調回路(タンク回路)の解説を致します.
現在では,RFコイルとキャパシタが並列になった並列共振回路が広く使われていますが,かつては,直列共振回路も使われていました.
2月12日(日)に示した回路は,上に示すように,LC並列共振回路と,それに直列に接続されるマッチング回路(キャパシタ)から形成されます.
Lには,それに直列な電気抵抗Rがあるものとしています.なお,キャパシタにも損失がありますが,NMR用のキャパシタは,損失ができるかぎり小さくなるように作られています(Q値で言うと1000以上)ので,今のところ考慮しません.
上の図で,Cm,Ctは可変となっていますが,これらは,左から見たときの回路のインピーダンスが,(純抵抗)50Ωとなるように調整されます.
すなわち,Cm(マッチングキャパシタ)のインピーダンスは,1/(jωCm)(純虚数)ですので,LC並列回路のインピーダンスをZ=Zr+jZiとあらわしたとき,
Zr=50 (Ω)
Zi=-1/(jωCm)
となるように調整されます.
この続きは次回.
コウキソの伊藤初美です。
遊びにきてみました!!
先生の誕生日だったんですねー!1月15日!!
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