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

Technical Report ·
DOI:https://doi.org/10.2172/138658· OSTI ID:138658

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.

Research Organization:
US Geological Survey, Denver, CO (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
AI08-92NV10874
OSTI ID:
138658
Report Number(s):
USGS-OFR-92-490; ON: DE93016278; TRN: 93:016534
Resource Relation:
Other Information: PBD: 1993
Country of Publication:
United States
Language:
English