- 學位論文
應用熱像儀檢測地下空洞之研究
Application of Thermal Imager on Investigating the Subsurface Cavity
摘要
本研究主要的目的在於應用紅外線熱影像儀，以熱源注入方式來檢測地面下空洞的位置與大小。紀錄地面上混凝土版各點（256像素點）溫度值，及其像素所佔格數推算出空洞範圍之大小，來探討不同混凝土強度、版厚、空洞深度、土層以及有無配筋情況下，達到空洞大小範圍時所需時間及溫差變化情形。 試驗結果顯示：(1)透過計算溫差處理，可判別空洞的位置；(2) 混凝土版越厚，溫差值為正數所占畫素達到空洞範圍面積顯像像素格數時所需時間愈長，混凝土的版厚對熱像儀顯像時間有明顯的影響；(3) 空洞深度越深，溫差值為正數所占畫素達到空洞範圍面積顯像像素格數時所需時間愈長，空洞深度對熱像儀顯像時間有明顯的影響。試驗證明本文提出的檢測方法，可以檢測出地下空洞的位置與大小。
並列摘要
The paper presents the application of thermal imager in investigating the position and area of a subsurface cavity effectively. This research probes into the cavity position by way of running into hot water as exerting the heat source, and note down the concrete plate each point with number value ( 256 pixels) of temperature. According to the pixels numbers calculation the size of the cavity range, and probes into different concrete intensity, plate of thick, cavity depth, soil layer and have or none reinforcing bar situation, the necessary time and difference in temperature change when reach the cavity range. The experimental results demonstrate: (1) deal with through the way of difference in temperature, can identify the position of cavity; (2) when the pixels numbers is equal to the cavity areas, the thicker concrete plate is necessary the longer time (3) when the pixels numbers is equal to the cavity areas, the deeper cavity depth is necessary the longer time. The presented method is experimentally concluded as efficiency and practicality in identifying the position and area of a subsurface cavity.