Discerning localized thermal impulses using an embedded distributed optical fiber sensor network

Jenkins, Ron; Joyce, Peter; Kong, Adam; Nelson, Charles

doi:10.1117/12.2514386

Cited by 1 publication

(1 citation statement)

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“…There are several examples of high-temperature FBG experiments in recent literature, including studies of FBG decay at constant temperatures during annealing [17,18], FBG spectral shift as a function of temperature and laser intensity [19], and the performance of an array of embedded FBG sensors during an HEL strike [16]. Additionally, more recent work by Jenkins et al investigated embedded distributed optical fiber sensors for use in laser strike detection, even in the presence of strain [20,21]. The goal of this work is to quantitatively analyze the thermal response of embedded FBG sensors as a result of rapid temporal transients during rapid temperature changes and compare the results to previous models.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Effects during High Energy Laser Strikes on Embedded Fiber Bragg Grating Sensors

Ross

Jenkins

Nelson

et al. 2019

Sensors

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As the applications of fiber Bragg gratings (FBGs) continue to grow and become more advanced, it becomes necessary to understand their behavior when exposed to high temperatures in unique situations. In these experiments, uniform 1530-nm fiber Bragg gratings and Type K Cr-Al thermocouples were embedded in three-ply carbon fiber composites. A 100 W high energy laser (HEL) heated the composites to high temperatures over timespans less than one second, and FBG spectral data and thermocouple temperature data were collected during each HEL heating test. The data from three high energy laser tests that represent different levels of damage to the FBG are analyzed to explore the spectral response and thermal decay of embedded FBG sensors when exposed to high temperatures over short timespans. Results are compared to a previously proposed power-law model describing the decay of FBGs in bare fiber when held at constant temperatures over much longer timespans.

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