USACRREL (U.S. Army Cold Regions Research & Engineering Laboratory) Precise Thermistor Meter.
Abstract
To facilitate the study of frazil ice in the field, a highly accurate, portable water temperature meter was required. The USACRREL Precise Thermistor Meter was designed and built to meet this need. The meter is rugged, battery-operated, waterproof, and able to operate over a wide range of ambient temperatures. A unique feature of this instrument is the use of software to compensate for temperature-dependent variation in the analog electronics. The circuitry consists of an analog printed circuit board and a low power microcomputer. The resistance of a calibrated thermistor is determined and its temperature calculated using the Steinhart-Hart equation. The accuracy of the meter was determined both theoretically and in cold room tests. The hardware and software used in the meter are described. Keywords include: Frazil ice, Ice, Instrument fabrication, and Water temperature measurement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1985
- Accession Number
- ADA166470
Entities
People
- Gary M. Trachier
- James S. Morse
- Steven F. Daly
Organizations
- Cold Regions Research and Engineering Laboratory