Traditional systems for analyzing Bragg grating sensors present problems such as loss of light intensity, inaccuracy in reading and a linear increase in cost with the addition of more sensors. Accuracy is impaired by the interference of the signal from any of the sensors in the set via the reference channel and the cost is high due to the large number of detectors and couplers required.
The invention consists of a Bragg grating sensor analysis system that uses a broadband pulsed source and at least two filters in a spectral delay line for each sensor in the array.
The light emitted by the pulsed source is reflected by the Bragg grating sensors and then by the filters in the spectral delay line. The light reflected by the filters is then detected by a single photodetector. The ratios between the pulses from the reflection provide information about temperature variations or deformations in the sensors.
Patent title:
Bragg grating sensor analysis system with reduced cost and improved accuracy
Deposit Number:
PI 0305829 8
Pontifical Catholic University of Rio de Janeiro – PUC-Rio
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