NDLI: A Fiber Optic Rf Resonant Cavity Sensor for Strain Sensing - Forrcs

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A Fiber Optic Rf Resonant Cavity Sensor for Strain Sensing - Forrcs

Content Provider	Semantic Scholar
Author	Schoenwald, Jeffrey S. Messinger, Ross H.
Copyright Year	2012
Abstract	A fiber optic vibration and strain sensor described by Rogowski et al [1] implemented a radio frequency (rf) phase locked loop in an optical strain gauge bonded to or embedded in a composite structure. A laser is modulated at radio frequency by a voltage controlled oscillator. The phase delay through the optical fiber transmission line is compared to the source oscillator, and the resulting error signal shifts the oscillator, locking the phase. Strain in the specimen (a composite panel) produces a change in optical phase length in the fiber. Tracking the frequency change gives a measure of the integrated strain transduced into the fiber from the strained panel. Strain level sensitivity on the order of 0.1 microstrains has been reported [1]. However, considerable confusion surrounds the performance of the reported sensor, since noise presumed to arise from cladding/core mode interference and splice reflections makes significant filtering necessary, reducing the bandwidth of the sensor, e.g., increasing the response time to detect strains [2]. This limits vibration control applications.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=2686&context=qnde&httpsredir=1&referer=
Language	English
Access Restriction	Open
Subject Keyword	Biological specimen CDISC SEND Biospecimens Terminology Calcium-Sensing Receptor Catastrophic interference Cladding (fiber optics) Confusion Embedded system Embedding Eye Group delay and phase delay Interference (communication) Lock (computer science) Modulation Optical fiber Oscillator Device Component Phase-locked loop Radio frequency Reflection (computer graphics) Response time (technology) Sensor Splice (system call) Tissue fiber Transmission Line Device Component voltage
Content Type	Text
Resource Type	Article

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