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Simplified Computational Approach for Determining In Situ Probe Spacing of a Dual Probe Heat Pulse Sensor
Author(s) -
Wen Minmin,
Liu Gang,
Horton Robert
Publication year - 2018
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2017.11.0402
Subject(s) - nonlinear system , thermal diffusivity , deflection (physics) , thermal , linear model , dual (grammatical number) , mechanics , algorithm , computer science , mathematics , optics , physics , thermodynamics , statistics , art , literature , quantum mechanics
Core Ideas Probe spacing corrections greatly improve soil thermal property determination. The linear model and the non‐linear model are unified into a single algorithm. The new model simplifies significantly the spacing calculation procedure. For the dual probe heat pulse (DPHP) method, the probe spacing r is very important for the calculation of volumetric heat capacity and thermal diffusivity. Separate models for probe spacing correcting resulting from linear and nonlinear deflections have been reported earlier. In this paper, the linear model and the nonlinear model are unified into a single algorithm. Compared with the earlier models, the new model simplifies the procedure. To use the new model, it is not necessary to calculate a deflected angle, and also there is no longer a need to initially identify whether probe deflection is inward or outward. The new r correcting approach provides an easy way to use relationship that accounts for linear and nonlinear probe deflections.