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Effects of temperature and thermal gradient on thermocouple psychrometer measurements / H. M. Abuel-Naga in Géotechnique, Vol. 61 N° 10 (Octobre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 10 (Octobre 2010) . - pp. 875-885 Titre : Effects of temperature and thermal gradient on thermocouple psychrometer measurements Type de document : texte imprimé Auteurs : H. M. Abuel-Naga, Auteur ; Bouazza, A., Auteur Année de publication : 2011 Article en page(s) : pp. 875-885 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Neural  networks  Partial  saturation  Suction  Temperature  effects  Monitoring Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the results of a study aimed at assessing the effects of temperature and thermal gradient on psychrometer readings, and at developing a calibration protocol that takes into account these effects. An intensive calibration programme was conducted at different temperatures (20–35°C) and water potential levels (0·0 to ∼7·0 MPa), for this purpose. The thermal gradient was expressed as the difference in temperature between wet and dry junctions in the thermocouple psychrometer sensor. The collected calibration data were used to build an artificial neural network psychrometer model. The developed model was able to simulate successfully the psychrometer output at different conditions, and was used to conduct a detailed parametric study to evaluate the influence of temperature and thermal gradient on thermocouple psychrometer measurements. The outcome of this study shows the importance of including the effects of temperature and thermal gradient in the standard calibration process. Moreover, it introduces a new, precise calibration protocol that takes advantage of the artificial neural network approach. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.p.102 [article] Effects of temperature and thermal gradient on thermocouple psychrometer measurements [texte imprimé] / H. M. Abuel-Naga, Auteur ; Bouazza, A., Auteur . - 2011 . - pp. 875-885. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 10 (Octobre 2010) . - pp. 875-885 Mots-clés : Neural  networks  Partial  saturation  Suction  Temperature  effects  Monitoring Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the results of a study aimed at assessing the effects of temperature and thermal gradient on psychrometer readings, and at developing a calibration protocol that takes into account these effects. An intensive calibration programme was conducted at different temperatures (20–35°C) and water potential levels (0·0 to ∼7·0 MPa), for this purpose. The thermal gradient was expressed as the difference in temperature between wet and dry junctions in the thermocouple psychrometer sensor. The collected calibration data were used to build an artificial neural network psychrometer model. The developed model was able to simulate successfully the psychrometer output at different conditions, and was used to conduct a detailed parametric study to evaluate the influence of temperature and thermal gradient on thermocouple psychrometer measurements. The outcome of this study shows the importance of including the effects of temperature and thermal gradient in the standard calibration process. Moreover, it introduces a new, precise calibration protocol that takes advantage of the artificial neural network approach. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.p.102