為了降低測量樣品交流磁化率的成本及增加儀器的可攜性，在本次的研究工作中，我們設計、開發並且組裝一台低成本的桌上型交流磁化率儀，用於檢測材料的磁特性。
此自製的交流磁化率儀系統包含感應線圈組、激發線圈、鎖相放大器及Arduino。激發線圈負責為內部的感應線圈組及待測樣品提供外加交流正弦磁場，使樣品產生交流磁訊號。利用此訊號穿透由感應線圈圍成平面的磁通量，讓感應線圈內部生成感應電流，再利用由IC AD630組成的鎖相放大器模組檢測此感應訊號，最後將其傳輸到微控制器Arduino上。另外，我們透過3D列印技術設計並列印出儀器所需的零件，並結合一些電子零件及金屬配件，完成儀器整體的架構。
我們所使用的每一個零件與設備都能在網路商家或實體店家中能輕易的找到，且價格便宜。我們自製的儀器成本遠低於舊型的交流磁化率儀，總花費不超過5000新台幣。而3D列印機也隨著技術的進步，成本不斷的降低，精度不斷的提升，逐漸的普及，3D列印件也能使用實驗室中的3D列印機隨時重新列印，我們儀器的每個零件都唾手可得。且儀器為自製的緣故，大幅降低了儀器維修的困難度，同時也大幅縮減了儀器佔用的空間。

To reduce the cost of AC susceptibility measurement and to increase the portability of the instrument, we designed, developed, and build a low-cost desktop AC susceptometer for measuring the magnetic properties of materials in this study.
The system of the AC susceptometer consists of pick-up coils, a primary coil, a lock-in amplifier, and Arduinos. The primary coil is responsible for providing an applied AC sinusoidal magnetic field to the pick-up coils and the test sample. The magnetic signal penetrates the magnetic flux in the plane enclosed by the pick-up coils and generates an induction current inside the pick-up coils, which is detected by the lock-in amplifier composed of IC AD630 and transmitted to the microcontroller Arduino. In addition, we designed and printed out the parts we needed in the instrument through 3D printing technology and combined some electronic parts and metal accessories to construct the instrument.
All parts we used can be easily and inexpensively found on the internet shops or in brick-and-mortar stores. The cost of our self-made instrument is much lower than the old AC susceptometer, and the total cost is less than NTD$5000. With the advancement of technology, the cost of 3D printers is decreasing, the accuracy is increasing, and the printers can be reprinted at any time by using the 3D printers in the lab. It significantly reduces the difficulty of the instrument maintenance and also reduces the space occupied by the instrument because the instrument is self-made.

第一章　緒論　　1
第二章　理論基礎　　3
第三章　實驗儀器介紹　　5
第四章　數據　　38
第五章　總結　　40

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