@article{ref1,
title="Electronic machine guards",
journal="Journal of occupational accidents",
year="1982",
author="Vartiala, H",
volume="4",
number="2-4",
pages="171-174",
abstract="The recent development of new and increasingly reliable electronic components has made it possible to detect a person's presence in ways other than by sheer mechanical contact. A worker entering a given space can be detected by means of a suitable detector. Such systems can be utilized when constructing machine safety devices. Detection may take place with the aid of a light beam, Doppler effect radar, TV camera, electromagnetic field or thermic field.<p />",
language="",
issn="0376-6349",
doi="",
url="http://dx.doi.org/"
}