本文首先設計一個【可調式圓管曲度－截面變形量測器】，此量測器可安置於不同尺寸圓管的中央，並可同時量測圓管在彎曲負載時的曲度及整個截面變形量的變化，此量測器主要有兩個特點：（1）八點量測－量測器上每45度有一個位移檢出器（LVDT），共八個對稱分佈於圓周上，相較於一般僅以圓管截面上下兩點的變化量來描述橢圓化，更能準確地量測圓管截面在承受純彎曲力矩負載時的位移變化量。（2）可調式位移檢出器－位於圓周上的八個位移檢出器（LVDT）與量測器本體的連結為可調式，此設計使本量測器能適用於不同管徑的圓管。
位測試該量測器，本文針對D/t比（外徑/厚度比）為40及60的SUS304不鏽鋼圓管進行循環彎曲負載，至皺曲（Buckling）的實驗。結果顯示本量測器的量測，截面從起始負載至皺曲的變化皆可精確的測得。

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