創新儀器測量光的繞射與干涉之強度分佈

科展類別
臺灣國際科展
屆次
2005年
科別
物理科
學校名稱
臺北市立麗山高級中學
作者
李欣樺
關鍵字
光的繞射,干涉強度,波動性質

摘要或動機

Light diffraction and interference are two of most basic experiments, but they’re the most powerful evident of wave properties of light. Due to the lack of high-quality and fairly accurate equipment, these important experiments are limited to the simple demonstration of the phenomena. Especially, the spatial intensity variations of diffraction and interference patterns are, however, completely not drawn to scale. In order to precisely measure the diffraction and interference patterns intensity, we consult lots of reference, search for suitable materials and reuse waste old and useless laser printers. Finally, overcoming disadvantages of time consumption and poor spatial resolution, we develop two accurate, practical and delicate methods. We use optical power control circuit created on our own to steady the brightness emitting of laser diode. Then the high linear photoelectric detector is stored on XYZ axis micro movement control platform. Next high degree of reflection rotating polygon mirror employing optical lever is collocated with low vibration blushless motor. Thus, a self-scanning intensity pattern plotter is accomplished. At the same time, it overcome difficulties like time wasting and low reliability during doing these kind of optical experiments. In this article these two dependable and worth popularizing measurements of light diffraction and interference is going to be introduced. 光的繞射與干涉實驗是光學中最基本的實驗之一,也是證明光的波動性質之最主要的依據。在一般的高中物理實驗室中受限於器材的等級與精度,只能對光的繞射與干涉做近似定性的實驗,尤其是繞射、干涉圖形上的光能量分佈,完全無法以現有的器材做精準的測量。 在這一年的專題研究中,我們小組針對測量光的繞射、干涉能量分佈為目標,參閱許多相關文獻,四處尋找適用的材料及零件,發揮廢物利用的精神,克服萬難,發展出兩種精巧、實用又準確的測量方法,我們以自行發展的光功率控制電路使雷射二極體的光度穩定,並且以高線性度的光感測元件裝載在自行設計的X.Y.Z微動機台上,同時利用光槓桿原理所構成的高反射度的旋轉六面鏡,配合低震動的無刷馬達,完成了一套能自動掃瞄繞射能量分佈曲線的測試儀,經實際使用相當地穩定可靠,可以快速而精確地獲得大量的實驗數據,比對這些數據不僅能驗證繞射理論,並能更深入地延伸理論的探討。


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