A High-Stability Capacitance Sensor System and its Evaluation
Journal article preprint
NAVAL ACADEMY ANNAPOLIS MD
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A new capacitance sensor system was developed with a microcontroller, commercial humidity and temperature sensors capacitance-to-digital-converter and a custom-built capacitance sensor. The performance of the system was evaluated by simulation and by testing of the prototype. Impact of variations of ambient conditions on the system performance was analyzed and a model for correcting the humidity and temperature influence was developed. Based on experimental results obtained in noncontrolled environment using a standard capacitor 1 pF, the 24-hour stability of the system was estimated to be within 30 parts in 106. The high stability and sensitivity of the system allow its effective use in object detection applications. Several sensors were constructed and evaluated in sensing various materials under different scenarios.
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods
- Electricity and Magnetism