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Self-calibration circuits and routines for low-cost measuring systems
Publikationstyp
Journal Article
Date Issued
2008-02-01
Sprache
English
Author(s)
Institut
Volume
50
Issue
2
Start Page
287
End Page
293
Citation
Microwave and Optical Technology Letters 50 (2): 287-293 (2008-02-01)
Publisher DOI
Scopus ID
A Low-cost measurement system suited for in situ moisture monitoring of buildings is presented. The system consists of a robust and compact resonant microwave sensor linked to a miniaturized, low-cost vector network analyzer. Several such systems can be controlled by a central monitoring station. The measurement accuracy is enhanced significantly by vectorial self-calibration. To determine the magnitude and the required 360°-phase information, an inexpensive combined gain and 180°-phase detector is used, where the full phase information is obtained by adequately modeling the sensor's and the calibration standards ' phase response. Different self-calibration circuits are examined and their suitability is proved by comparative measurements. Finally, the system's performance is tested in a high humidity environment.
Subjects
Microwave aquametry
Network analyzer
Phase modeling
Self-calibration circuits
Sensor system
DDC Class
000: Allgemeines, Wissenschaft