Optical-fiber detection device which involves testing for good performance
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United States of America Patent
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Sep 26, 1989
Grant Date -
N/A
app pub date -
Feb 2, 1988
filing date -
Feb 2, 1987
priority date (Note) -
Expired
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Abstract
An optical-fiber detection device which involves testing for correct operation is provided with at least one sensor having a sensing element which operates by light reflection at the end of an optical fiber and with a line for transmission of light by optical fibers. The transmission line connects the sensor to a source of periodic light pulses and to an electronic signal detection and processing unit. The sensor includes an optical fiber segment of predetermined length between the sensing element and an intermediate connection which produces a state pulse by reflection. The sensing element produces a measurement pulse which is separated from the state pulse by an elementary time interval. The electronic unit serves to detect the state of operation of the sensor by means of the presence or absence of the state pulse or reference pulse in the signals.
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