利用太赫兹技术测量冰的融化速率

MEASURING THE MELTING RATE OF ICE USING TERAHERTZ TECHNIQUE

近年来由于冰雪灾害导致的电网、公路结冰以及农作物和树木不堪重负而倒塌的现象频繁出现,对工程设施、交通运输和人民生命财产造成了直接破坏,所以对于冰融化过程的探究仍然值得关注。本文提出一种利用透射式太赫光谱系统探测冰融化过程的方法。当冰表面开始融化时,表面产生的水对太赫兹波有更强的吸收,且太赫兹波对于这一固液相的转变非常敏感。因此,可通过分析太赫兹透射信号峰值的强度下降速率了解冰表面融化状况。本文选取两种不同融化速率的物质作为实验样品,在常温22℃下进行融化实验,结果表明,纯水冻成的冰块的太赫兹透射信号强度的下降速率大于冰晶的下降速率,验证了冰晶盒具有良好的蓄冷作用。

In recent years, grid and highway icing, as well as the collapse of crops and trees, caused by snow and ice disasters have frequently occurred, which has caused direct damage to engineering facilities, transportation and people's lives. So the exploration of the ice melting process is still worthy of attention. This paper presents a method for detecting the ice melting process using a transmissive terahertz spectroscopy system. When the ice surface begins to melt, the water produced on the surface of ice has a stronger absorption of terahertz waves, so the terahertz signal intensity is sensitive to this solid-liquid phase transition. Therefore, the ice surface melting condition can be understood by analyzing the rate of decrease in the intensity of the terahertz transmission signal. In this paper, two materials with different melting rates were selected as experimental samples, and the melting experiment was carried out at room temperature of 22℃. The results show that the decreasing rate of terahertz transmission signal intensity of ice blocks frozen in pure water is much greater than that of ice crystals, which proves that ice crystal boxes have good cold storage effect.