7 April 2008 Advanced FBG sensing through rapid spectral interrogation
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Abstract
A fiber Brag grating sensor interrogator has been developed which is capable of gathering vectors of information from individual fiber Bragg gratings by capturing the full optical spectrum 3 kHz. Using a field programmable gate array with high speed digital-to-analog converters and analog-to-digital components, plus a kilohertz rate MEMS optical filter, the optical spectrum can be scanned at rates in excess of 10 million nanometers per second, allowing sensor sampling rates of many kilohertz while maintaining the necessary resolution to understand sensor changes. The autonomous system design performs all necessary detection and processing of multiple sensors and allows spectral measurements to be exported as fast as Ethernet, USB, or RS232 devices can receive it through a memory mapped interface. The high speed - full spectrum - fiber Bragg grating sensor interrogator enables advanced interrogation of dynamic strain and temperature gradients along the length of a sensor, as well as the use of each sensor for multiple stimuli, such as in temperature compensation. Two examples are described, showing interrogation of rapid laser heating in an optical fiber, as well as complex strain effects in a beam that had an engineered defect.
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Wesley Kunzler, Jason Newman, Daniel Wilding, Zixu Zhu, Tyson Lowder, Richard Selfridge, Stephen Schultz, Michael Wirthlin, "Advanced FBG sensing through rapid spectral interrogation", Proc. SPIE 6933, Smart Sensor Phenomena, Technology, Networks, and Systems 2008, 69330D (7 April 2008); doi: 10.1117/12.776459; https://doi.org/10.1117/12.776459
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KEYWORDS
Sensors

Fiber Bragg gratings

Optical filters

Field programmable gate arrays

Analog electronics

Data communications

Optical fibers

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