A NONDESTRUCTIVE METHOD OF FOLLOWING MOISTURE CONTENT AND TEMPERATURE CHANGES IN SOILS USING THERMISTORS

A NONDESTRUCTIVE METHOD OF FOLLOWING MOISTURE CONTENT CHANGES IN SOIL MATERIALS USING THERMISTORS IN A MODIFIED WHEATSTONE BRIDGE CIRCUIT IS PRESENTED. THE THERMISTORS, EMBEDDED DIRECTLY IN THE SOIL, ARE USED AS BOTH HEATING ELEMENTS AND SENSORS AND RESPOND TO CHANGES IN THERMAL CONDUCTIVITY OF THE SOIL AS WATER CONTENT CHANGES. BRIDGE OUTPUTS ARE CONVENIENTLY RECORDED ON A FAST RESPONSE POTENTIOMETRIC RECORDER. ONCE A CALIBRATION CURVE FOR THE PARTICULAR SOIL MATERIAL HAS BEEN OBTAINED, THE METHOD ALLOWS MOISTURE CONTENTS TO BE FOLLOWED IN EXPERIMENTS INVOLVING BOTH EVAPORATION AND INFILTRATION WHERE BOTH CHANGES IN BULK DENSITY AND PARTICLE GEOMETRY ARE NOT EXTREME. THE SAME BRIDGE CIRCUITS AND THERMISTORS MAY ALSO BE USED TO MEASURE TEMPERATURE IN SOIL OR OTHER MATERIALS WHEN THE THERMISTORS HAVE BEEN CALIBRATED OVER THE DESIRED TEMPERATURE RANGE.

  • Authors:
    • Cornish, P M
    • Laryea, K B
    • Bridge, B J
  • Publication Date: 1973-4

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 309-14
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00238120
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 19 1973 12:00AM