Proposed algorithm for determining the delta intercept of a thermocouple psychrometer curve

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Description

The USGS Hydrologic Investigations Program is currently developing instrumentation to study the unsaturated zone at Yucca Mountain in Nevada. Surface-based boreholes up to 2,500 feet in depth will be drilled, and then instrumented in order to define the water potential field within the unsaturated zone. Thermocouple psychrometers will be used to monitor the in-situ water potential. An algorithm is proposed for simply and efficiently reducing a six wire thermocouple psychrometer voltage output curve to a single value, the delta intercept. The algorithm identifies a plateau region in the psychrometer curve and extrapolates a linear regression back to the initial start ... continued below

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10 p.

Creation Information

Kurzmack, M.A. July 1, 1993.

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Description

The USGS Hydrologic Investigations Program is currently developing instrumentation to study the unsaturated zone at Yucca Mountain in Nevada. Surface-based boreholes up to 2,500 feet in depth will be drilled, and then instrumented in order to define the water potential field within the unsaturated zone. Thermocouple psychrometers will be used to monitor the in-situ water potential. An algorithm is proposed for simply and efficiently reducing a six wire thermocouple psychrometer voltage output curve to a single value, the delta intercept. The algorithm identifies a plateau region in the psychrometer curve and extrapolates a linear regression back to the initial start of relaxation. When properly conditioned for the measurements being made, the algorithm results in reasonable results even with incomplete or noisy psychrometer curves over a 1 to 60 bar range.

Physical Description

10 p.

Notes

U.S. Geological Survey, Box 25425, MS 517, Denver Federal Center, Denver, CO 80225-0425 (US); OSTI as DE93016278

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  • Other Information: PBD: 1993

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  • Other: DE93016278
  • Report No.: USGS-OFR--92-490
  • Grant Number: AI08-92NV10874
  • DOI: 10.2172/138658 | External Link
  • Office of Scientific & Technical Information Report Number: 138658
  • Archival Resource Key: ark:/67531/metadc628085

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • July 1, 1993

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 6:48 p.m.

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Kurzmack, M.A. Proposed algorithm for determining the delta intercept of a thermocouple psychrometer curve, report, July 1, 1993; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc628085/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.