Journal cover Journal topic
Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.302 IF 1.302
  • IF 5-year value: 1.356 IF 5-year
    1.356
  • CiteScore value: 1.47 CiteScore
    1.47
  • SNIP value: 0.810 SNIP 0.810
  • IPP value: 1.37 IPP 1.37
  • SJR value: 0.598 SJR 0.598
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 8 Scimago H
    index 8
  • h5-index value: 14 h5-index 14
Discussion papers
https://doi.org/10.5194/gi-2019-43
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-2019-43
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 18 Feb 2020

Submitted as: research article | 18 Feb 2020

Review status
This preprint is currently under review for the journal GI.

Signal Processing for In-Situ Detection of Effective Heat Pulse Probe Spacing Radius as the Basis of a Self-Calibrating Heat Pulse Probe

Nicholas J. Kinar1, John W. Pomeroy1, and Bing Si1,2 Nicholas J. Kinar et al.
  • 1Global Institute for Water Security, Centre for Hydrology, Smart Water Systems Lab, University of Saskatchewan
  • 2Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan

Abstract. A sensor comprised of an electronic circuit and a hybrid single and dual heat pulse probe was constructed and tested along with a novel signal processing procedure to determine changes in the effective dual-probe spacing radius over the time of measurement. The circuit utilized a proportional–integral–derivative (PID) controller to control heat inputs into the soil medium in lieu of a variable resistor. The system was designed for on-board signal processing and implemented USB, RS-232 and SDI-12 interfaces for Machine-to-Machine (M2M) exchange of data, thereby enabling heat inputs to be adjusted to soil conditions and data availability shortly after the time of experiment. Signal processing was introduced to provide a simplified single-probe model to determine thermal conductivity instead of reliance on late-time logarithmic curve-fitting. Homomorphic and derivative filters were used with a dual-probe model to detect changes in the effective probe spacing radius over the time of experiment to compensate for physical changes in radius as well as model and experimental error. Theoretical constraints were developed for an efficient inverse of the exponential integral on an embedded system. Application of the signal processing to experiments on sand and peat improved the estimates of soil water content and bulk density compared to methods of curve-fitting nominally used for heat pulse probe experiments. Applications of the technology may be especially useful for soil and environmental conditions where effective changes in probe spacing radius need to be detected and compensated over the time of experiment.

Nicholas J. Kinar et al.

Interactive discussion

Status: open (until 05 May 2020)
Status: open (until 05 May 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Nicholas J. Kinar et al.

Data sets

Signal Processing for In-Situ Detection of Effective Heat Pulse Probe Spacing Radius as the Basis of a Self-Calibrating Heat Pulse Probe: Data N. J. Kinar https://doi.org/10.6084/m9.figshare.11371455

Model code and software

Signal Processing for In-Situ Detection of Effective Heat Pulse Probe Spacing Radius as the Basis of a Self-Calibrating Heat Pulse Probe: Software N. J. Kinar https://doi.org/10.6084/m9.figshare.11372181

Nicholas J. Kinar et al.

Viewed

Total article views: 201 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
165 31 5 201 10 8
  • HTML: 165
  • PDF: 31
  • XML: 5
  • Total: 201
  • BibTeX: 10
  • EndNote: 8
Views and downloads (calculated since 18 Feb 2020)
Cumulative views and downloads (calculated since 18 Feb 2020)

Viewed (geographical distribution)

Total article views: 167 (including HTML, PDF, and XML) Thereof 167 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 02 Apr 2020
Publications Copernicus
Download
Short summary
Heat pulse probes are widely used to monitor soil thermal and physical properties for agricultural and hydrological monitoring related to crop productivity, drought, snowmelt and evapotranspiration. Changes in the effective probe spacing distance can cause measurement inaccuracy. This paper uses a novel heat pulse probe and theory to compensate for changes in effective distance thereby enabling more accurate sensor outputs useful for forecasts and predictions of drought and flooding.
Heat pulse probes are widely used to monitor soil thermal and physical properties for...
Citation