本文分別利用定溫、定電流感測電路作熱差實驗量測實驗，探討加熱線圈的熱通量差、溫度差與流量的關係，由實驗中我們發現定溫感測電路易受環境溫度影響，反應時間較快，輸出電壓和流量呈一非線性關係，定電流感測電路工作溫度範圍較廣，反應時間較慢，輸出電壓和流量大致呈線性關係。
我們利用定溫感測模式之實驗數據和數值模擬結果作比較，數值模擬和定溫感測的實驗數據比較仍有差距存在，差距是由於自製感應管無法使兩加熱線圈長度相同所造成的。但改以兩加熱段的熱通量差做比較，可去除實驗和數值解二者差距，二者的吻合度佳。

Measurements from the thermal-difference experiments were made via the constant- temperature and constant-current sensing circuits; which were used to analyze the relations among the thermal-difference (temperature and thermal flux) from the two heating sections and the flowrate passing through the sensor tube. Experimental results show that sensor tube with the constant-temperature mode has faster response time, its output voltage and flowrate relation is nonlinear, and it was prone to influence of environmental temperature. The characteristics of sensor tube with the constant-current sensing circuit was: wider range of working temperature, slower response time, and roughly a linear relation between output voltage and flowrate.
Disagreement of the thermal flux of the two heating sections among the measurement data with the constant-temperature mode and the numerical simulations do exist. Such discrepancy should caused by the unequal length of two handmade heating coils wrapped around the sensor tube. The discrepancy was eliminated by comparison in terms of the thermal flux difference from two heating sections, and good agreement were obtained between numerical and experimental approaches.

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