Study on the development of measuring method of diffusion processes of heat, gas and liquid phases in porous media and material contraction

这项研究的目的是开发测量气体和液体在混凝土材料等多孔介质中迁移时的热传递的设备。在第一阶段，尝试开发了一种产生水蒸气的装置，其温度在10ﾟC到80ﾟC之间，任意强度的水蒸气的自由能。经过一系列的试验，明确了该装置的成功操作方法，即在水蒸气的产生状态、连接管道和腔体之间设置温差，以避免露珠，并发现这种控制对产生理想的水蒸气条件非常重要。在第二阶段，尝试了测量混凝土湿度的传感器的研制。尝试了在1.0~2.0 mm的小距离范围内测量货币阻力变化的方法。虽然精度不高，但实现了误差为5%的湿度测量。第三个阶段尝试了激光传感器体积变化测量方法的发展。首先找出了实际应用中不允许的误差。经过密集的试验，误差降到了实际可用的程度，但仍有必要继续努力升级功能。

The study aims at the development of devices to measure heat transition with gas and liquid migration within the porous media such as concrete material. On the first phase, the development of an apparatus to produce the water vapor which has temperature between 10ﾟC to 80ﾟC,free energy of vapor of arbitrary intensity was tried. After series of trials, the successful maneuvering method of the apparatus was made clear in such a way that the temperature difference between the generating state of the vapor, connecting pipes and the cell in the chamber should be setso that no dewdrops will be made and this control is found to be exceedingly important to produce ideal vapor condition.In the second phase, the development of the sensor to measure the humidity in concrete was tried. The method to measure the currency resistance change between small distance of 1.0 to 2.0mm was tried. Though the high accuracy can not be expected, the humidity measurement with 5% error was attained.In the third atage, the development of measuring method of volume change was tried by laser sensor. In the beginning the error which can not be allowed in the real application was found. With intensive trial, the error reduced to the level of practically usable extent, however, the continued effort to grade up the function is necessary.