Accession Number : AD0764976

Title :   Telemetry of Soil-Moisture and Weather Variables,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Hanes,F. P. ; Womack,L. M.

Report Date : FEB 1965

Pagination or Media Count : 26

Abstract : Development and installation of a soil-moisture and weather station capable of telemetering soil-moisture and weather variables demonstrated that such an installation can be used to monitor the soil and weather conditions of remote areas. A soil-moisture measuring circuit developed by WES and consisting of a specially designed a-c ohmmeter with three overlapping measuring ranges was determined to be an improvement over commercially available portable soil-moisture bridges. The circuit also did much to extend the capability of the electrical-resistance type soil-moisture sensor into the very low range of soil moisture. All currently available soil-moisture sensors operating on the electrical-resistance principle tend to be sensitive to the chemical composition of the soil and may therefore be erratic over extended periods of wetting and drying, as was also the case in this investigation. As the tests continue, nuclear moisture meters which employ neutron moderating techniques for determining moisture will be integrated into the system developed in this investigation in an attempt to more accurately define moisture conditions.

Descriptors :   (*WEATHER STATIONS, REMOTE CONTROL), METEOROLOGICAL INSTRUMENTS, SOIL MECHANICS, MOISTURE, ATMOSPHERIC PRECIPITATION, ATMOSPHERIC TEMPERATURE, WIND, TELEMETER SYSTEMS, CALIBRATION

Subject Categories : Meteorology
      Hydrology, Limnology and Potamology
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE