Apparatus and method of sensing using distributed excitation...

Details Apparatus and method of sensing using distributed excitation... Apparatus and method of sensing using distributed excitation...

G - Physics

01

N

G01N 21/00 (2006.01) G01N 21/47 (2006.01) G01N 21/64 (2006.01)

Patent

CA 2128315

Distributed transverse excitation of an optical guidedwave structure by means of ambient radiation from a natural or man made source avoids the need to connect a source through one end of the device. This permits a wide range of sensing with significant improvement in the ease of installation and lower costs than conventional guidedwave sensors. In this type of sensor the local environment, the state of the sensor, or some measurand of interest can modulate its output optical power by modifying the transmission of radiant energy through the device. A unique aspect of transverse excitation is that distributed sensing of the local environment is also possible through direct control of the level of excitation. The optical guidedwave structure can thus be made to sense its state, or its local environment. When transverse distributed excitation with low level ambient radiation is combined with visual inspection the sensor becomes "self-contained", extremely simple and very low cost.

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