Item: A new sensor for snow wetness monitoring
Title: A new sensor for snow wetness monitoring
Proceedings: 1990 International Snow Science Workshop, Bigfork, Montana USA, October 9-13
Authors: A. Denoth and W. Gciessmair
Abstract: For long-term measurements at snow wetness a flat dielectric sensor bets been developed. The sensor measures the dielectric constant of the surrounding or or underlaying medium; it is operated at a fixed frequency of 20 MHz. Snow wetness can easily calculated from the measured snow permittivity and snow density. The measurement system consists of a relatively small flat capacitive sensor connected to a tuning and display unit with a built-in microcomputer. Measurements of snow permittivity can be made every 8 seconds; the data are displayed on a LCD and are also stored in a 32kB RAM. The system can be operated at ambient temperatures down to -20 C, it is battery operated (Pb-accu) and the total power consumption is less than 0.7 Watts at 6V operating voltage. Typical field applications and measurements with this system are reported: -Measurements of snow wetness profiles, -Monitoring of snow wetness variations with time, -Detection and registration of percolating meltwater waves.
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Keywords: dielectric, snow wetness, microcomputer, lcd, temperature
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