Fast Method for Visualization of Temperature Distribution Using Acoustic Computerized Tomography
Fast Method for Visualization of Temperature Distribution Using Acoustic Computerized Tomography
复制标题
使用声学计算机断层扫描实现温度分布可视化的快速方法
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
K. Nagai
中科院分区：
文献类型：
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作者：
E. Ishikawa;K. Mizutani;K. Nagai
声速取决于介质温度，并根据声音的飞行时间进行估计。提出了一种利用声学计算机断层扫描（A-CT）实现温度分布可视化的快速方法。在这项研究中，考虑到温度梯度场的属性，这是可视化对象，并由高斯函数近似，CT所需的数据点的数量进行了优化，提高了可视化的速度。通过对半径为100 mm的圆形空间（其中包括半径约为40 mm的高温区域）内温度分布的非接触测量，采用11个测量点的线性扫描和22.5°角步长的旋转扫描相结合的数据采集系统获得了足够的空间分辨率。除了数据采集几何结构的优化，天线延迟线振荡器用于声速的检测，以敏感和简化系统。通过A-CT获得的可视化结果与热电偶测量结果吻合良好。本文提出的快速可视化方案在空调、反应堆监测和大气监测等应用中具有传统方法无法比拟的优势。
Sound velocity is dependent on medium temperature and is estimated from the time of flight of sound. We propose a fast method for the visualization of temperature distribution using acoustic computerized tomography (A-CT). In this study, considering the property of a temperature gradient field, which is the visualization object and is approximated by a Gaussian function, the number of data points required by the CT is optimized and the speed of visualization is improved. As a result of noncontact measurements of the temperature distribution in the circular space of 100 mm radius which includes a high-temperature area of about 40 mm radius, sufficient spatial resolution is obtained by the data acquisition system which combines linear scanning of 11 measurement points and rotational scanning with a 22.5° angular step. In addition to the optimization of the data acquisition geometry, an aerial delay-line oscillator is used for the detection of sound velocity, in order to sensitize and simplify the system. Visualized results obtained by the A-CT agree well with the measurements taken by thermocouples. The fast visualization scheme proposed in this paper has an advantage over conventional methods in such applications as air conditioning, reactor monitoring and atmospheric monitoring among others.