熱管是一種在真空狀態下將固定量之工作流體填充於真空之金屬管內而造成流體相變化之熱移裝置，被廣泛地使用在電子構裝或設備，諸如筆記型電腦、1U伺服器上。熱管之最大熱傳量不但受限於金屬材質之管材、管壁等幾何參數，還有填充量、毛細結構、工作流體等之熱力參數。其中最重要的便是真空度之影響了。本研究以熱力學理論為基礎，利用質量不滅定律提供一個完整熱管真空度檢測方法及其裝置，其係以破壞性檢測，先提供一乾淨的真空環境，並記錄該環境下的溫度、濕度及真空壓，再令欲檢測之熱管升溫，並透過破壞手段使其內部之工作流體釋出於真空環境下，此時該環境下之溫度、濕度與真空壓即有所改變，俾再次記錄以與前次比較，以計算出該熱管的真空度。其結果顯示在真空度與填充量之誤差都不會超過 15%。

Heat pipe, the device which is widely used in the electronic structures, IC Chips or equipments, such as laptop computers or 1U server; provide the heat transfer from heat source to coolant. A heat pipe is a heat removed device comprising a vacuum pipe that charges a certain amount of working fluid and seals the tube. In this study, the vacuum
measurement was based on the thermodynamic theory, and derivate from mass balance law. This study introduces a new device that measures the vacuum pressure of the heat pipe by a destructiveness method. Both of the relative errors for vacuum pressure and inventory in the experimental results are within 15% when compared with the known vacuum pressure and inventory.