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Title: Triaxial thermopile array geo-heat-flow sensor

A triaxial thermopile array geothermal heat flow sensor is designed to measure heat flow in three dimensions in a reconstituted or unperturbed subsurface regime. Heat flow can be measured in conductive or permeable convective media. The sensor may be encased in protective pvc tubing and includes a plurality of thermistors and an array of heat flow transducers arranged in a vertical string. The transducers produce voltage proportional to heat flux along the subsurface regime and permit direct measurement of heat flow in the subsurface regime. The presence of the thermistor array permits a comparison to be made between the heat flow estimates obtained from the transducers and heat flow calculated using temperature differences and Fourier's Law. The device is extremely sensitive with an accuracy of less than 0.1 Heat Flow Units (HFU) and may be used for long term readings.
Authors:
 [1] ;  [2] ;  [3] ;  [3]
  1. (Tracy, CA)
  2. (Albuquerque, NM)
  3. (Tijeras, NM)
Publication Date:
OSTI Identifier:
868345
Report Number(s):
US 5121993
DOE Contract Number:
AC04-76DP00789
Resource Type:
Patent
Research Org:
AT & T CORP
Country of Publication:
United States
Language:
English
Subject:
triaxial; thermopile; array; geo-heat-flow; sensor; triaxial; thermopile; array; geothermal; heat; flow; sensor; designed; measure; heat; flow; dimensions; reconstituted; unperturbed; subsurface; regime; heat; flow; measured; conductive; permeable; convective; media; sensor; encased; protective; pvc; tubing; plurality; thermistors; array; heat; flow; transducers; arranged; vertical; string; transducers; produce; voltage; proportional; heat; flux; subsurface; regime; permit; direct; measurement; heat; flow; subsurface; regime; presence; thermistor; array; permits; comparison; heat; flow; estimates; obtained; transducers; heat; flow; calculated; temperature; differences; fourier; law; device; extremely; sensitive; accuracy; heat; flow; units; hfu; term; readings; direct measurement; extremely sensitive; temperature difference; heat flow; heat flow; heat flow; heat flow; heat flow; heat flow; heat flow; heat flow; heat flux; temperature differences; pvc tubing; permit direct; direct measure; voltage proportional; geothermal heat; triaxial thermopile; triaxial thermopile; thermopile array; thermopile array; transducers arranged; thermal heat; flow sensor; flow sensor /374/73/