【摘要】 本文采用响应时间为1μs的超小型薄膜铂热电阻温度计及日本YOKOGAWA DL2700高速数字示波器,对微秒量级脉冲激光照射下冷冻生物组织内的热传导进行了实验研究。结果发现,在激光脉宽较短时,在冷冻组织内观察到了非傅里叶导热现象。脉宽越小,组织厚度越薄,非傅里叶导热特征越明显。而功率密度和光斑直径只影响温度上升的高低,对是否会出现非傅里叶导热没有影响。更多还原

【Abstract】 The heat conduction in frozen biological tissue irradiated by high - power short - pulse laser was investigated experimentally. The micro - scale film resistance thermometer with 1 JAS response time was used to measure temperature. The output of the film resistance thermometer was recorded dynamically by a YOKOGAWA DL2700 digital oscilloscope. The experimental results showed that, when the pulse duration is short, the heat conduction in frozen biological tissue is of non - Fourier behavior. The shorter the pulse duration and the thinner the biological tissue, the more notable the non -Fourier heat conduction. The power density and spot size will influence the maximum value of temperature during laser heating, and have nothing t& do with the problem whether or not the non - Fourier heat conduction can take place.更多还原