NDLI: Theory and application of a capacitive sensor for safeguarding in industry

Content Provider	IEEE Xplore Digital Library
Author	Karlsson, N.
Copyright Year	1994
Description	Author affiliation: Dept. of Phys. & Meas. Technol., Linkoping Univ., Sweden (Karlsson, N.)
Abstract	A capacitive sensor for the safeguarding of automatically working machines in industry has been developed. It can be used as a complement to more expensive pressure sensitive mats, light curtains or fences. The sensor consists of two electrically conducting planes, insulated electrically from the ambient. The planes are placed opposite each other, one in the floor and one in the ceiling of for example a robot cell. One of the planes is used as the antenna of the transmitter and the other works as the antenna of the receiver. When conductive conditions in the space between the two planes are altered, e.g. a person enters, the signal from the receiver changes and indicates the presence of the person. By the use of a current/voltage-converter followed by a lock-in amplifier as receiver an excellent signal-to-noise ratio is achieved. A sine wave modulated by bandwidth limited white Gaussian noise is used as transmitting signal. This signal reduces the strength of the electric field per frequency unit, radiated by the sensor. The theory for the sensor and the sensor signal handling is presented and some practical experiments are described. The theory is well verified by the experimental results.
Starting Page	479
Ending Page	482
File Size	350990
Page Count	4
File Format	PDF
ISBN	0780318803
DOI	10.1109/IMTC.1994.351915
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-05-10
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitive sensors Receiving antennas Transmitting antennas Sensor phenomena and characterization Dielectrics and electrical insulation Floors Robot sensing systems Orbital robotics Transmitters Voltage
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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