Field Deployable Fiber Bragg Grating Strain Patch for  Long-Term Stable Health Monitoring Applications

Schukar, Vivien; Kusche, Nadine; Kalinka, Gerhard; Habel, Wolfgang

doi:10.3390/app3010039

Cited by 9 publications

(4 citation statements)

References 4 publications

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“…The bonding interface and methodology is the most common source of error concerning strain transfer and needs to be considered carefully for a given application 14,15 . When strain in a host material causes deformation in the bonding interlayer, the interlayer reacts causing opposite deformation in the host material.…”

Section: B Mechanical Stability and Bondingmentioning

confidence: 99%

Advanced Optical Sensor Technology: Launch Vehicle and Spacecraft Applications

Orr

Trevino

Dalton

2014

AIAA Atmospheric Flight Mechanics Conference

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The advent of compact, high-performance optical sensors of strain and temperature based on frequencydomain interrogation of special optical fibers yields many unique opportunities for sensing in environments that are challenging for traditional sensor technologies. An intriguing application is the use of fiber Bragg grating (FBG) sensors to collect critical structural, thermal, and even acoustic data throughout the launch vehicle and spacecraft engineering lifecycle, including during flight.Fiber Bragg Grating sensors are formed from special optical perturbations of a communications-grade optical fiber, and act as high sensitivity, low mass, electrically passive, and electrically immune detectors of structural strain, temperature, and other quantities; the serial architecture and embeddable sensor element with very small cross section make FBGs an attractive solution for minimally invasive instrumentation of both ground test and flight test experiments, especially where traditional (piezoelectric, foil-resistive) sensors are impractical due to harsh environmental conditions.In this paper, several elements of the state of the art of FBG sensors are detailed with a focus on the necessary technology development steps required to employ FBGs as a critical, enabling technology for collection of mission-critical structural dynamics, thermal, and subsystem health data in harsh flight environments. Current capabilities and limitations are detailed in the context of this unique application where existing commercial and research-grade sensor systems have not yet been extensively deployed.

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Section: B Mechanical Stability and Bondingmentioning

confidence: 99%

Advanced Optical Sensor Technology: Launch Vehicle and Spacecraft Applications

Orr

Trevino

Dalton

2014

AIAA Atmospheric Flight Mechanics Conference

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“…A field programmable gate array (FPGA) is applied to realize high speed sampling for high speed sampling, and an advanced reduced instruction set computer (RISC) machine (ARM) is employed to deal with the large amount of logical control and calculation for powerful computational capabilities [17,18]. Thus, the central wavelengths are capable of being calculated with the digital signal according to (1). The principle of the interrogation method is shown in Fig.…”

Section: Tunable F-p Filtering Principlementioning

confidence: 99%

“…Fiber Bragg gratings (FBGs), by virtue of their inherent advantages, such as high sensitivity, compact size, low cost, and immunity to electromagnetic interference, have been applied widely in engineering fields [1][2][3]. They are utilized to measure the temperature or stress of structures for central wavelengths which can change synchronously [4,5].…”

Section: Introductionmentioning

confidence: 99%

Research on a Pulse Interference Filter Used for the Fiber Bragg Grating Interrogation System

Zhang

Ren

et al. 2018

Photonic Sens

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In this paper, a novel pulse interference filter for fiber Bragg grating (FBG) interrogation based on the tunable Fabry-Perot (F-P) filtering principle is proposed and experimentally demonstrated. The self-developed FBG interrogation system is devised for the aircraft health management of key structures. Nevertheless, the pulse interference is detected in the reflection spectrum of FBG causing interrogation system unstable. To address the problem, the first-order lag pulse broadening filter is proposed in this paper. The first-order lag filter is applied to preprocess and smooth the original signal, meanwhile enhancing the signal-to-noise ratio (SNR). Afterwards, peaks of reflection spectrum are distinguished with pulse interference by pulse broadening. Experimental results indicate that 634 peaks are detected before adopting the first-order lag pulse broadening filter. Comparatively, the number of peaks decreases to 203 after filtering the interference pulse, and the correct rate of peak detection is higher than 98.5%. Through the comparison with the finite impulse response (FIR) filter, the advantage of first-order lag filter is proved. The vibration monitoring experiment demonstrates that this system has high dynamic precision with a dynamic interrogation range of 0 Hz-400 Hz, and the maximum repetition rate of 800 Hz.

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“…The fiber Bragg grating (FBG) has attracted considerable attention because of its distinguished advantages when it is compared with electric sensors owing to its electromagnetic interference immunity, high sensitivity, compact size and so on [1][2][3][4][5][6]. Utilizing the characteristics feature that the Bragg wavelength of FBG shifts owing to the effect of temperature and strain, many types of FBG-based sensors have been manufactured [7].…”

Section: Introductionmentioning

confidence: 99%

Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing

Li¹,

Zhang²,

Song³

et al. 2021

Optica Applicata

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A novel technology for the simultaneous and independent measurement of dual parameters is proposed and experimented. By using a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing conditions, the sensor structure is designed such that the reflective single-peak spectrum splits into a twin-peak spectrum, which makes the FBG spectrum form a natural spectral peak splitting bias. A measurement limitation exists in the FBG sensor packaging at room temperature, which can be solved by the high-temperature cured packaging method. To verify the validity of the theory and methodology, the experimental system is used. In the range from –1000 to +1000 με and from 35 to 75°C, the Bragg wavelength change is relative linear to the strain and temperature. The temperature and strain variations can be independently and simultaneously measured using the split peak, and the deviations of the FBG sensor are ±1°C and ±5 με, respectively. This single FBG sensor can realize dual-parameter measurement, which is valuable for narrow-space health monitoring.

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Field Deployable Fiber Bragg Grating Strain Patch for Long-Term Stable Health Monitoring Applications

Cited by 9 publications

References 4 publications

Advanced Optical Sensor Technology: Launch Vehicle and Spacecraft Applications

Advanced Optical Sensor Technology: Launch Vehicle and Spacecraft Applications

Research on a Pulse Interference Filter Used for the Fiber Bragg Grating Interrogation System

Dual-parameter sensing characteristics of a single fiber Bragg grating half-pasted by 1C-LV epoxy under different curing

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