本研究利用單染料雙放光法研製一種新型的溫度感測微粒，以消除溫度感測材料濃度不均與激發光照不均之問題。對各別微粒在微流經流道不同位置時之溫度與速度進行計算，以利用於量測微流道內流體之溫度與速度。本研究將量子點CsPbBr3塗覆於聚醯胺微粒上，製備成具有溫度敏感性之溫度感測微粒，並以加熱之微流道實測溫度變化以驗證技術之可行性。微流道之溫度驗證則使用熱電偶量測配合數值模擬結果求得之流道中央溫度與反算之溫度做比較。所製備之微粒溫度敏感性透過光譜儀於溫度範圍25~65 (℃ ) 時測出為 1544.5 ~ 1717.9 (K)，在溫度範圍 40~50 (℃) 時為1558.7 ~ 1790.7 (K)。研究中進一步記錄微粒流動至一具有溫度差 (約40~50 ℃) 之流道內不同位置時32顆微粒之相關參數，其中將微粒平均強度與最大光強度代入單染料雙放光公式後即得對應的二條溫度校正趨勢線，其斜率分別為3463.9 (K) 及7511.3 (K)；而透過溫度校正趨勢線計算出來的溫度梯度趨勢線斜率分別為 -1.10 (℃/mm) 及 - 0.81 (℃/mm)，驗證溫度變化趨勢與微流道溫度梯度趨勢呈現正相關。製備之溫度感測微粒與矽油之混合液於百萬分點濃度為0.065 (ppm)，在此低濃度下於溫度敏感波段與溫度不敏感波段所對應的影像取完平均後之訊雜比多數集中在20~50，顯示在低濃度下微粒仍具有一定的訊雜比。溫度梯度趨勢線之標準差較大，原因推測為實驗中之長曝光時間設定造成微粒影像被拉長而使光強度計算之準確度較低，進而造成部份反算結果不佳。 另由數值模擬而得之流道內溫度梯度約為 - 4.5 (℃/mm)，而微流道溫度校正實測中所得之溫度梯度為 - 1.91 (℃/mm)。較靠近流道入口處的熱電偶實測的溫度比模擬結果高，而較靠近流道出口處的熱電偶實測的溫度比模擬結果低。原因推測來自微流道之軸向熱傳現象，亦即流道壁面熱傳導大於流體熱對流，使近流道入口區的流體透過壁面熱傳導所得到的熱通量較多所致。

In this study, a novel type temperature-sensitive particles is developed using the one-dye two-color method to overcome the nonuniformity issues of coated temperature-sensitive material and excitation source. Indivisual particles are traced at different positions in the microchannel, and the temperature and velocity of the fluid can be obtained by calculating these particle’s velocities and temperatures. Quantum Dot (QD) of CsPbBr3 was coated on the polyimde particles to make the particle temperatue-sensitive, and a heated micronchannel was used for verification of the concept. The verification is done by comparing the calculated temperature with the temperature in the microchannel estimated from thermocouple measurements and numerical simulation. The temperature sensitivity of the temperature-sensitive particles measured by spectrometer in the temperature range of 25~65 (°C) is at 1544.5~1717.9 (K), and in the temperature range of 40~50 (°C) is at 1558.7~1790.7 (K). Parameters of 32 particles were recorded and traced at different locations in the microchannel with a temperature difference of about 40-50 °C. The average and maximum intensity of the particles were used in the single-dye two-color equation to obtain two temperature calibration trend lines with slopes of 3463.9 (K) and 7511.3 (K), respectively. The slope of the temperature gradient trend line calculated from the temperature calibration trend line is - 1.10 (°C/mm) and - 0.81 (°C/mm) respectively, which shows that the temperature trend is correlated with the microchannel temperature gradient trend. In this study, the concentration of temperature-sensitive particles and silicone oil mixture was 0.065 ppm, and the SNR after averaging were found to be mostly in the range of 20 to 50. These results indicate that the particles have a high enough SNR for operation at the concentration. Large standard deviation of the temperature gradient trend line was found because the particle images were recorded with a long exposure time setting, resulting in an elongated particle image and lower accuracy of the light intensity calculations, which leads to the worse inverse-calculation results. The simulated temperature gradient in the microchannel was - 4.5 (°C/mm), while the temperature gradient obtained through experiment was - 1.91 (°C/mm). The temperature measured by thermocouple closer to the inlet area is higher than the simulated result, while closer to the outlet area of the flow channel it is lower. This difference may due to the axial heat conduction phenomenon of the microchannel, i.e., the effect of heat conduction at the channel wall is larger than the effect of heat convection of the fluid, causing the difference in the heat flux obtained by the fluid.

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