Thermal emittance monitoring in cooling lava process

B. Andò, M. Coltelli, N. Pitrone
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Abstract

Absrrac, In recent years great effort were dedicated to the comprehension of phenomena connected to volcanic activities. In particular, the behaviour offlowing lava during a big eruption is of main interest in managing this kind of emergency. The very first parameters to be taken into accountfor studying thepath of the lava flow are those defining the crust properties, which are deeply dependent on the coolingprocess. In this DaDer a multi-sensorial measurement svstem is DroDosed. value in the selected area, due to the operating mode of the adopted instruments based on the sensing of radiation emitted by the whole target area. In this paper a new measurement set-up is proposed, which aims to monitor emittance values recorded on a user-defined grid of a cooling lava region. The set-up uses instruments based on radiation thermometry which produce data to be 1. 1. I which aims IO the characterization of the WUSI formation by monitoring changes of its thermalproperties. processed and stored by a virtual instrument developed in LabVIEW'. In particular a thermal camera is adopted allowing to perform measurements with the required resolution. The use of this device will improve the quality of the information in the respect of the previous experimental I. INTRODUCTION The understanding of phenomena ruling the cooling process of flowing lava in big eruptions has gained more and more interest due to the needs of suitable actions managing this kind of emergency. These actions are strictly related to the behaviour of the magma in terms of both its flow rate and its rheological characteristic, which depend on the evolution of the process regulating the crust formation. The cooling process, regulated by the beat transfer between magma and atmosphere, is assumed to be the major responsible of the solidification of external layers of lava and hence of the crust growing process. Thermal emittance is a material property regulating the heat transfer process between the material body and the surroundings. It depends on size, shape, surface roughness and angle of viewing and can be used to study the structural evolution of the analyzed material during the observed process. In the case of growing crust the emittance varies accordingly and characterizes the state evolution. Observation of the thermal emittance would allow for the estimation of the heat transfer evolution, which dictates both the formation of the crust and the behaviour of the magma. Some of the authors, in previous work, proposed a methodology for direct measurement of heat transfer in cooling lava [I]. It is based on the contemporaneous use of three different instruments to measure the temperature gradient in a lava flow close to the surface, and the temperature and thermal radiation of the lava-atmosphere interface.
冷却熔岩过程的热辐射监测
摘要:近年来,人们在火山活动现象的研究上付出了巨大的努力。特别是,大喷发期间熔岩流动的行为是管理这类紧急情况的主要兴趣。研究熔岩流的路径时首先要考虑的参数是那些定义地壳性质的参数,这些属性与冷却过程密切相关。本文提出了一种多传感器测量系统。值,这是由于所采用的仪器的工作模式是基于对整个目标区域发出的辐射的感知。本文提出了一种新的测量装置,旨在监测在冷却熔岩区域的自定义网格上记录的发射度值。该装置使用基于辐射测温的仪器,其产生的数据为1。1. 其目的是通过监测其热性能的变化来表征wsi地层。由LabVIEW开发的虚拟仪器进行处理和存储。特别地,采用了热成像仪,允许以所需的分辨率进行测量。由于需要采取适当的行动来管理这类紧急情况,对大喷发中流动熔岩冷却过程的现象的理解越来越引起人们的兴趣。这些作用与岩浆的流动速率和流变特性密切相关,这取决于调节地壳形成过程的演化。由岩浆和大气之间的热量传递所调节的冷却过程,被认为是熔岩外层凝固的主要原因,因此也是地壳生长过程的主要原因。热发射率是调节材料与周围环境之间传热过程的一种材料特性。它取决于尺寸、形状、表面粗糙度和观察角度,可以用来研究被分析材料在观察过程中的结构演变。在地壳生长的情况下,发射度也随之变化,这是状态演化的特征。对热发射的观察将使我们能够估计热传递的演化过程,这决定了地壳的形成和岩浆的行为。一些作者在以前的工作中提出了一种直接测量冷却熔岩传热的方法[1]。它是基于同时使用三种不同的仪器来测量靠近地表的熔岩流的温度梯度,以及熔岩-大气界面的温度和热辐射。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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