{"id":209204,"date":"2024-03-21T14:06:36","date_gmt":"2024-03-21T14:06:36","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e5%90%b8%e5%8f%8e%e6%90%8d%e5%a4%b1%e6%96%b9%e7%a8%8b%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%80%81%e5%bf%9c%e7%94%a8\/"},"modified":"2024-05-17T15:08:51","modified_gmt":"2024-05-17T15:08:51","slug":"%e5%90%b8%e5%8f%8e%e6%90%8d%e5%a4%b1%e6%96%b9%e7%a8%8b%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%80%81%e5%bf%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e5%90%b8%e5%8f%8e%e6%90%8d%e5%a4%b1%e6%96%b9%e7%a8%8b%e5%bc%8f-%e5%ae%9a%e7%be%a9%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95%e3%80%81%e5%bf%9c%e7%94%a8\/","title":{"rendered":"\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u5fdc\u7528"},"content":{"rendered":"

\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u306e\u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u304a\u3088\u3073\u7121\u7dda\u901a\u4fe1\u3084\u533b\u5b66\u30a4\u30e1\u30fc\u30b8\u30f3\u30b0\u3001\u6750\u6599\u79d1\u5b66\u3067\u306e\u5fdc\u7528\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u5fdc\u7528<\/h2>\n

\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f<\/strong>\uff08Absorption Loss Equation\uff09\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u7269\u8cea\u3092\u901a\u904e\u3059\u308b\u969b\u306b\u3069\u308c\u3060\u3051\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u5931\u308f\u308c\u308b\u304b\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u65b9\u7a0b\u5f0f\u3067\u3059\u3002\u4e3b\u306b\u96fb\u6c17\u304a\u3088\u3073\u78c1\u6c17\u306e\u5206\u91ce\u3067\u4f7f\u7528\u3055\u308c\u3001\u7279\u306b\u901a\u4fe1\u3084\u6750\u6599\u79d1\u5b66\u306a\u3069\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u305d\u306e\u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u304a\u3088\u3073\u5fdc\u7528\u4f8b\u306b\u3064\u3044\u3066\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n

\u5438\u53ce\u640d\u5931\u306e\u5b9a\u7fa9<\/h2>\n

\u5438\u53ce\u640d\u5931\u3068\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u5a92\u8cea\uff08\u4f8b\u3048\u3070\u7a7a\u6c17\u3001\u6c34\u3001\u30ac\u30e9\u30b9\u306a\u3069\uff09\u3092\u901a\u904e\u3059\u308b\u969b\u306b\u3001\u5a92\u8cea\u306b\u3088\u3063\u3066\u30a8\u30cd\u30eb\u30ae\u30fc\u304c\u5438\u53ce\u3055\u308c\u3066\u6e1b\u5c11\u3059\u308b\u73fe\u8c61\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u306e\u640d\u5931\u306f\u3001\u901a\u4fe1\u54c1\u8cea\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u305f\u3081\u3001\u7279\u306b\u7121\u7dda\u901a\u4fe1\u6280\u8853\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n

\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u306e\u57fa\u672c\u5f62<\/h2>\n

\u5438\u53ce\u640d\u5931\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u65b9\u7a0b\u5f0f\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n

$$
\nL = 8.686 \\alpha d
\n$$<\/p>\n

\u3053\u3053\u3067\u3001<\/p>\n

    \n
  • L<\/code> \u306f\u5438\u53ce\u640d\u5931\uff08dB\uff09\u3001<\/li>\n
  • \\alpha<\/code> \u306f\u5a92\u8cea\u306e\u5438\u53ce\u4fc2\u6570\uff08Np\/m\uff09\u3001<\/li>\n
  • d<\/code> \u306f\u96fb\u78c1\u6ce2\u304c\u901a\u904e\u3059\u308b\u8ddd\u96e2\uff08m\uff09\u3067\u3059\u3002<\/li>\n<\/ul>\n

    \u3053\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u5a92\u8cea\u304c\u4e00\u69d8\u3067\u3042\u308a\u3001\u5438\u53ce\u304c\u8ddd\u96e2\u3068\u6bd4\u4f8b\u95a2\u4fc2\u306b\u3042\u308b\u5834\u5408\u306b\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n

    \u5438\u53ce\u4fc2\u6570\u306e\u8a08\u7b97<\/h2>\n

    \u5438\u53ce\u4fc2\u6570 \\code\\(\\alpha\\) \u306f\u3001\u5a92\u8cea\u306e\u7269\u7406\u7684\u7279\u6027\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u6b21\u306e\u5f0f\u3067\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n

    $$
    \n\\alpha = \\frac{\\omega \\sqrt{\\mu \\sigma}}{2}
    \n$$<\/p>\n

    \u3053\u3053\u3067\u3001<\/p>\n

      \n
    • \\code\\(\\omega\\) \u306f\u89d2\u5468\u6ce2\u6570\uff08rad\/s\uff09\u3001<\/li>\n
    • \\code\\(\\mu\\) \u306f\u5a92\u8cea\u306e\u900f\u78c1\u7387\uff08H\/m\uff09\u3001<\/li>\n
    • \\code\\(\\sigma\\) \u306f\u5a92\u8cea\u306e\u5c0e\u96fb\u7387\uff08S\/m\uff09\u3067\u3059\u3002<\/li>\n<\/ul>\n

      \u89d2\u5468\u6ce2\u6570 \\code\\(\\omega\\) \u306f\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u307e\u3059\uff1a<\/p>\n

      $$
      \n\\omega = 2 \\pi f
      \n$$<\/p>\n

      \u3053\u3053\u3067\u3001\\code\\(f\\) \u306f\u5468\u6ce2\u6570\uff08Hz\uff09\u3067\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u3001\u7279\u5b9a\u306e\u5a92\u8cea\u3068\u5468\u6ce2\u6570\u306b\u5bfe\u3059\u308b\u5438\u53ce\u4fc2\u6570 \\code\\(\\alpha\\) \u3092\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

      \u5fdc\u7528\u4f8b<\/h2>\n

      1. \u7121\u7dda\u901a\u4fe1<\/h3>\n

      \u7121\u7dda\u901a\u4fe1\u3067\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u4f1d\u64ad\u3059\u308b\u969b\u306e\u640d\u5931\u3092\u6b63\u78ba\u306b\u4e88\u6e2c\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u901a\u4fe1\u7bc4\u56f2\u3084\u4fe1\u53f7\u5f37\u5ea6\u306e\u4f4e\u4e0b\u3092\u4e88\u6e2c\u3057\u3001\u9069\u5207\u306a\u30a2\u30f3\u30c6\u30ca\u914d\u7f6e\u3084\u30d1\u30ef\u30fc\u8a2d\u5b9a\u3092\u884c\u3046\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n

      2. \u533b\u5b66\u30a4\u30e1\u30fc\u30b8\u30f3\u30b0<\/h3>\n

      \u533b\u5b66\u30a4\u30e1\u30fc\u30b8\u30f3\u30b0\u3067\u306f\u3001\u4f8b\u3048\u3070MRI\uff08\u78c1\u6c17\u5171\u9cf4\u753b\u50cf\u6cd5\uff09\u306e\u6027\u80fd\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u60a3\u8005\u4f53\u5185\u306e\u7570\u306a\u308b\u7d44\u7e54\u306b\u304a\u3051\u308b\u96fb\u78c1\u6ce2\u306e\u5438\u53ce\u7279\u6027\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u9bae\u660e\u306a\u753b\u50cf\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

      3. \u6750\u6599\u79d1\u5b66<\/h3>\n

      \u65b0\u3057\u3044\u6750\u6599\u306e\u958b\u767a\u306b\u304a\u3044\u3066\u3001\u96fb\u78c1\u6ce2\u306e\u5438\u53ce\u7279\u6027\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u9ad8\u5438\u53ce\u6027\u6750\u6599\u306f\u3001\u30b7\u30fc\u30eb\u30c9\u3084\u30ec\u30fc\u30c0\u30fc\u5438\u53ce\u4f53\u3068\u3057\u3066\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u6750\u6599\u306e\u7279\u6027\u3092\u5b9a\u91cf\u7684\u306b\u8a55\u4fa1\u3057\u3001\u6700\u9069\u306a\u6750\u6599\u8a2d\u8a08\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

      \u307e\u3068\u3081<\/h2>\n

      \u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u5a92\u8cea\u3092\u901a\u904e\u3059\u308b\u969b\u306e\u30a8\u30cd\u30eb\u30ae\u30fc\u640d\u5931\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u7121\u7dda\u901a\u4fe1\u3001\u533b\u5b66\u30a4\u30e1\u30fc\u30b8\u30f3\u30b0\u3001\u6750\u6599\u79d1\u5b66\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u5206\u91ce\u3067\u5e83\u7bc4\u56f2\u306b\u308f\u305f\u308b\u5fdc\u7528\u304c\u3042\u308a\u3001\u305d\u306e\u7406\u89e3\u306f\u3053\u308c\u3089\u306e\u6280\u8853\u306e\u767a\u5c55\u306b\u5bc4\u4e0e\u3057\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u57fa\u672c\u7684\u306a\u6982\u5ff5\u3084\u8a08\u7b97\u65b9\u6cd5\u3092\u53c2\u8003\u306b\u3001\u3055\u3089\u306a\u308b\u5b66\u7fd2\u3092\u9032\u3081\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

      \u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f\u306e\u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u304a\u3088\u3073\u7121\u7dda\u901a\u4fe1\u3084\u533b\u5b66\u30a4\u30e1\u30fc\u30b8\u30f3\u30b0\u3001\u6750\u6599\u79d1\u5b66\u3067\u306e\u5fdc\u7528\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209204","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"\n\u5438\u53ce\u640d\u5931\u65b9\u7a0b\u5f0f | \u5b9a\u7fa9\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u5fdc\u7528<\/title>\n<meta name=\"description\" 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