{"title":"Thermal emittance monitoring in cooling lava process","authors":"B. Andò, M. Coltelli, N. Pitrone","doi":"10.1109/IMTC.2003.1208138","DOIUrl":null,"url":null,"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.","PeriodicalId":135321,"journal":{"name":"Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412)","volume":"55 10 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2003-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 20th IEEE Instrumentation Technology Conference (Cat. No.03CH37412)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IMTC.2003.1208138","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
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.