DocumentCode :
1894813
Title :
A warning system for chainsaw personal safety based on capacitive sensing
Author :
George, Boby ; Zangl, Hubert ; Bretterklieber, Thomas
Author_Institution :
Inst. of Electr. Meas. & Meas. Signal Process., Graz Univ. of Technol., Graz
fYear :
2008
fDate :
26-29 Oct. 2008
Firstpage :
419
Lastpage :
422
Abstract :
This paper presents a capacitive proximity sensor that helps to improve the personal safety features of a chainsaw. Even though chainsaws are equipped with safety features such as kickback protection and chain brakes, related accidents reported each year are huge in number. Safety can be enhanced to a high degree, by integrating human proximity sensing features to the chainsaw and hence activating its brake and turn-off the chainsaw automatically in the occurrence of an accident. This paper proposes a capacitive sensor to detect human proximity near the guide bar and chain of a chainsaw. A prototype sensing system has been developed and tested, validating the usefulness of the proposed scheme. The sensor capacitances are measured using a carrier frequency method with synchronous detection technique. The developed system provides information about human proximity at least for every 200 mus and hence enables the control unit to react in realtime. The system successfully distinguishes between proximity of human and wood. The developed system senses human proximity up to 15 cm from the chainsaw.
Keywords :
alarm systems; capacitive sensors; hand tools; safety systems; sawing machines; capacitive proximity sensor; capacitive sensing; chain brakes; chainsaw personal safety; kickback protection; warning system; Accidents; Alarm systems; Capacitance; Capacitive sensors; Humans; Protection; Prototypes; Safety devices; Sensor phenomena and characterization; System testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sensors, 2008 IEEE
Conference_Location :
Lecce
ISSN :
1930-0395
Print_ISBN :
978-1-4244-2580-8
Electronic_ISBN :
1930-0395
Type :
conf
DOI :
10.1109/ICSENS.2008.4716467
Filename :
4716467
Link To Document :
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