我們架設了一套交流磁化率量测系統，包含使用鋁及μ-metal(鈷鎳合金)所製造成之三層結構磁屏蔽桶，以及經過計算之後最佳化的激發線圈(excitation coil)、擷取線圈(pick-up coil)與接收線圈(input coil)的線圈參數條件，其中使用rf-SQUID做為sensor。在此實驗中我們所使用的方法為單頻交流磁導率χac法，此方法的特點就是我們外加一補償線圈，藉由調整補償線圈所製造之磁場將背景之磁場訊號消除至最低，可將梯度線圈之Balance調整至約為百萬分之七。我們使用此系統來測量C-反應蛋白(C-reactive Protein,CRP)，其SNR為2.53。交流磁化率χac之變化量(χac)為 17.8%。此系統所能偵測之磁性奈米粒子最低濃度可達0.00625 emu/L。

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