Hardware Design of a New Instrument to Control the Heat Pulse and Measure the Temperature of Stratum

Abstract:

In this work, we report the design of a new instrument including one heat pulse circuit and three temperature measure circuits. Heat pulse control circuit can control the heating time of heater strip. The heating power is 0.5W and the duty time of every heat pulse is 8s. Three temperature measure circuits can measure the change of stratum’s temperature before and after accurately. The temperature resolution is 0.001°C, precision is 0.01°C and sampling rate is 1 Hz. The instrument can save the temperature data for every measure process. It is also provided with the data communication interface. The data saved in the instrument can export to computer through the interface. The instrument can measure the stratum’s temperature easily and reliably. The instrument will play a role in the studies of hydrogeology and environmental geology besides the application of Shallow Geothermal heat

• Periodical: Advanced Materials Research (Volumes 614-615)
• Pages: 1422-1426
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.614-615.1422
• Online since: December 2012
• Authors: Cang Xu Feng, Zhen Shui Liu, Xiao Cui
• Keywords: Geothermal Energy, Hardware Design, Heat Pulse, Instrument, Stratum, Temperature

References

[1] Y.Mori, J.W. Hopmans, A.P. Mortensen.Estimation of Dadoes Zone Water Flux from Multi-Functional Heat Pulse Probe measurements [J]. Soil SCI SOC.Am.J.2005. 40. (600-602)

DOI: 10.2136/sssaj2004.0174

[2] T.Ren, G.J. Kluitenberg, R.Horton, Determining Soil Water Flux and Pore Water Velocity by a Heat Pulse Technique [J]. Soil SCI SOC.Am.J.2000. 41. (552-554)

DOI: 10.2136/sssaj2000.642552x

[3] Quanjiu Wang, Tyson E.Ochsner, Mathematical analyses of heat signal for soil water flux determination [J]. Water Resources Research.2002.37. (342-344)

DOI: 10.1029/2002wr001765