Temperature measurement of Ho:YAG laser induced bubble in water using silver halide IR optical fiber
Temperature measurement of Ho:YAG laser induced bubble in water using silver halide IR optical fiber
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使用卤化银红外光纤测量 Ho:YAG 激光诱导水中气泡的温度
DOI：
10.1117/12.767108
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
T. Arai
中科院分区：
文献类型：
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作者：
T. Iwasaki;E. Nakatani;T. Arai
我们测量了Ho：YAG激光诱导气泡在水中的局部瞬态温度的红外辐射测量与红外光纤研究热效应/损伤的这种气泡的血管治疗应用。尽管从理论和实验两个方面对Ho：YAG激光诱导气泡中的温度已有很多报道，但目前还没有找到时间响应良好的可靠的激光诱导气泡温度。利用芯径为1 mm的AgCl/AgBr红外光纤（Optran MIR，CeramOptec），构建了激光诱导气泡温度远程测量系统。闪光灯使何鸿燊兴奋起来：YAG激光（IH 102，NIIC，λ=2.1μm）光束通过石英光纤（芯直径：600μm）传送，并从水中的光纤尖端照射。改变红外光纤相对于石英玻璃光纤的尖端位置以测量局部气泡温度。红外光纤尖端的侧壁被黑色橡胶管覆盖，以防止Ho：YAG激光聚集到红外光纤中。通过HgCdTe红外检测器（KMPC 12 -2-J1，Kolmar Technologies，上升时间：500 ns）测量通过红外光纤传递的红外辐射。在测量气泡温度之前，对该光纤辐射检测系统进行了标定。由于气泡边界位置和形状随时间变化，我们校正了这些因素的影响。在800 mJ/pulse的激光作用下，测得气泡顶面的峰值温度为61.7±2.8°C。该温度比报道的温度低10度。气泡顶部的温度比气泡侧的温度高约9.8度。获得的温度随时间的分布可能是可用于研究气泡动力学所需的血管应用。
We measured the localized transient temperature of Ho:YAG laser induced bubble in water by infrared radiation measurement with a infrared optical fiber to study heat effect/damage of this bubble for vascular therapeutic applications. Although there have been many reports regarding to the temperature in the Ho:YAG laser induced bubble by both theoretical and experimental approaches, we can not find well-time-response reliable temperature in the laser induced bubble. We constructed the remote temperature measurement system to obtain the temperature of the laser induced bubble with the infrared optical fiber (Optran MIR, CeramOptec) made of AgCl/AgBr with 1mm in core diameter. The flash lamp excited Ho: YAG laser (IH102, NIIC,λ=2.1μm) beam was delivered through a silica optical fiber (core diameter: 600μm) and was irradiated from the fiber tip in water. The tip position of the infrared optical fiber against the silica glass fiber was changed to measure local bubble temperature. The sidewall of the infrared optical fiber tip was covered by a black rubber tube to prevent the collection of the Ho:YAG laser into the infrared fiber. The infrared radiation delivered through the infrared optical fiber was measured by the HgCdTe infrared detector (KMPC12-2-J1, Kolmar Technologies, rise time:500ns). This fiber optic radiation detection system was calibrated before the bubble temperature measurement. Since the bubble boundary location and its shape were changed with time, we corrected influences of these factors. We finally obtained the peak temperature of 61.7±2.8°C at the top surface in the laser induced bubble with 800mJ/pulse. This temperature was 10 degree lower than that of reported. The temperature at the top of the bubble was approximately 9.8 degree higher than that at the bubble side. Obtained temperature distribution with time may be available to study bubble dynamics necessary for our vascular applications.