非破壞性檢測之重要性，在於不破壞結構物下評估其功能；於基樁，常以音波回音法進行檢測；於版，則常以敲擊回音法進行檢測。但因反射應力波是非穩態訊號、結構量體及環境因素等影響，訊號常過於複雜及微弱，僅從時間域或頻率域不易準確評估，因而本研究提出時頻分析方法以提升評估結果。
本研究提出以複數連續小波之訊號處理方法，改善基樁音波回音法之訊號分析結果。經有系統化選擇出適合的母小波函數，再利用複數小波之伸縮、平移及相位特性，使得應力波波形特徵現象更易於判讀，同時提出複數母小波選擇方式及基樁完整性評估方法。經由數值模擬及現地試驗，將此方法應用於常見不同基樁形式及土層條件，並予以完整探討。結果顯示，即使是不同缺陷、材料、結構形式及樁底條件之基樁，量測訊號經由複數連續小波轉換，可由頻譜振幅圖顯示缺陷或不連續結構之訊號特徵，並可由相譜圖位更有效判識基樁材質變化及缺陷位置等，提供更客觀的解決方式及減少人為因素誤差；相較於傳統時域分析，可有效提升基樁評估之準確性。
敲擊回音波常用於評估混凝土版厚度和內部狀況的低應變完整性檢測，主要藉由沿版厚方向傳播的振動訊號進行評估。但測量所得的訊號包含表面波、反射波及來自環境的噪聲等，這些訊號影響版完整性的檢測結果。本研究採用基於互補式總體經驗模態分解的希爾伯特-黃變換，利用其自適應性及適合處理非穩態訊號的特性，有效區分和解釋敲擊回音法訊號的組成。互補式總體經驗模態分解可將訊號分解成數個本質模態函數，該函數是具有物理意義的成分訊號，且可減少模態混疊及最終殘值，而該方法的關鍵參數是通過幅值平方同調性分析進行評估選擇，所擇定的參數值性能經由數值模擬及模型試驗結果獲得驗證。同時使用希爾伯特頻譜加強判釋敲擊回音訊號的組成及物理特性。而在獲得界面回波的本質模態函數後，除運用所對應的主控尖峰頻率來計算界面位置外，還提出利用本質模態函數之相位訊息進行計算分析，結果表明所提出之方法可成功評估版厚及缺陷位置。

The objective of this paper is using time-frequency analysis to improve the integrity assessment of non-destructive testing for the pile and plate. The combination of sonic echo (SE) method and complex continuous wavelet transform (CCWT) is used to evaluate the integrity of pile. The signal analyzed by CCWT contains rich information about amplitude-frequency and phase-frequency. After analyzing 3D amplitude and phase spectrum, the reflection signal of the interface can be identified effectively. The simulated piles and the in-situ piles are tested successfully to verify the suitability of the proposed approach. Comparing with traditional time-domain analysis of SE method, it improves the accuracy of the depth of the defect, pile length, and pile-tip condition. Furthermore, it reduces the man-made error. The combination of impact echo (IE) method and Hilbert-Huang transform (HHT) is used to evaluate the integrity of plate. HHT based on complementary ensemble empirical mode decomposition (CEEMD) is used to analyze IE signals. The signal is broken down into several meaningful ingredients called intrinsic mode functions (IMFs). After obtaining the IMF of echo wave, the corresponding frequency of the peak magnitude is used to calculate the interface position. In addition, an approach using the phase information of IMF is proposed to determine the depth of the interface. It is successful in simulated plate and model tests. The result shows that the proposed method is suitable for plate integrity assessment.

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