隨著都市的快速發展，民眾以軌道運輸系統為主要大眾交通運輸的需求越來越大，對列車行車品質的要求也越來越高，噪音及列車舒適度的問題也逐漸被重視，而當列車通過曲線所產生的鋼軌波狀磨耗正是造成這些問題的原因之一，因此本研究建立一套以非接觸式雷射光點位移感測器的鋼軌縱向表面量測儀器及數據後處理方法，以簡便快速的方式，應用在鋼軌縱向表面波狀磨耗檢測上，反應出實際鋼軌波狀磨耗的情形。
　　在儀器實際量測前，必須先對儀器所量測的數據準確度及精確度作可行性驗證，確認誤差值在可接受範圍內。驗證成果說明此儀器的量測數據準確度小於5%，數據的離散程度小於0.01mm，對於量測得到的數據具有相當程度的參考性。
　　而實際量測針對台鐵沙崙支線中洲站轉彎半徑為200m的曲線上量測鋼軌波狀磨耗，藉由波長譜分析，找出此波狀磨耗影響之波長為64mm，並由數據觀察波狀磨耗深度會隨著列車通過次數的增加而增加。另外針對成大系統系拖航水槽實驗室的軌道接縫不整進行量測，並比較鋼軌接縫處有無研磨的差異，發現已研磨的長波長能量有明顯削減，整體鋼軌不整表現趨近平緩。

　　With the rapid development of the infrastructure in cities, the requirement of the public rail transportation system becomes more important. In order to improve the rail quality, the issue of noise and comfort of railway vehicle have been gradually investigated. The above problems can be caused by the rail corrugation, which is one of the most important factors. Thus, this study purposed a measurement system using non-contact laser displacement sensor for inspecting the rail surface, and the measurement data should be processed by a data post-processing procedure. The measurement system can be applied for the testing of the rail corrugation, which can simply realize the actual performance of the rail corrugation.
　　Before applying to the actual measurement, the accuracy and precision of the instruments should be verified by an experimental validation. The results of the validation indicates the accuracy of the instruments is less than 5 %, and the discrete degree of measurement data is less than 0.01 mm.
　　The actual measurement was located at Zhongzhou Station of Taiwan Railway Administration (TRA) Shalun Line, which has a 200 m radius curve. By the use of wavelength spectrum analysis, the impact of the rail corrugation in the wavelength 64 mm can be identified. Moreover, another measurement of track joint irregularities was performed at the Naval application laboratory of National Cheng Kung University (NCKU) Department Systems and Naval Mechatronic Engineering. According to the results of the experiment, the energy of the long wavelength becomes lower, and the performance of the track joint irregularities was approximately smooth.

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