Dual probe heat pulse method (DPHP) is a popular method for measuring soil thermal properties. However when this method is applied in the field, the distance between the temperature probe and the heating probe (probe spacing) may change due to probe deflection, and thus cause error in measured heat capacity (c) of soil. We developed a self-calibrated DPHP for in situ calibration of probe spacing, using a temperature probe with two imbedded thermistors (10 mm apart in the longitudinal direction). Experimental results for sand and fine sand samples indicate that this method can significantly reduce error caused by the probe deflection. If we define theta as the inclination angle of probe deviation from the vertical direction, for inward deflection with 0.8 degrees < theta < 0.9 degrees, the error in c is between -8.1 and -14.3%; after in situ calibration, it is between -0.1 and -4.3%. For outward deflection with 3.2 degrees < theta < 3.5 degrees, the error in c is in the range from 22.9 to 38.8%; after in situ calibration, the error reduces to from -3.8 to -7.8%. This new DPHP design may be applied in the field for reducing error caused by probe deflection.
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Amrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, IndiaAmrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, India
Podder, Arup
Alex, Susan M.
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CSIR NIIST, Chem Sci & Technol Div, Ind Estate, Thiruvananthapuram 695019, Kerala, IndiaAmrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, India
Alex, Susan M.
Maiti, Mrinmoy
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Amrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, IndiaAmrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, India
Maiti, Mrinmoy
Maiti, Kaustabh Kumar
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CSIR NIIST, Chem Sci & Technol Div, Ind Estate, Thiruvananthapuram 695019, Kerala, India
CSIR NIIST, AcSIR, Thiruvananthapuram 695019, Kerala, IndiaAmrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, India
Maiti, Kaustabh Kumar
Bhuniy, Sankarprasad
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Amrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, India
Amrita Univ, Dept Chem Engn & Mat Sci, Coimbatore 641112, Tamil Nadu, IndiaAmrita Univ, Amrita Ctr Ind Res & Innovat, Coimbatore 64112, Tamil Nadu, India
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Nankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R ChinaNankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
Hou, Sheng-Li
Dong, Jie
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Nankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R ChinaNankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
Dong, Jie
Tang, Meng-Hua
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Nankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R ChinaNankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
Tang, Meng-Hua
Jiang, Xiao-Lei
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Nankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R ChinaNankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
Jiang, Xiao-Lei
Jiao, Zhuo-Hao
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Nankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R ChinaNankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
Jiao, Zhuo-Hao
Zhao, Bin
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Nankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R ChinaNankai Univ, Minist Educ, Dept Chem, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China