A Fiber Bragg Grating Sensor Interrogation System Based on a Linearly Wavelength-Swept Thermo-Optic Laser Chip

Lee, Hyung Seok; Lee, Hwi Don; Kim, Hyo Jin; Cho, Jae Du; Jeong, Myung Yung; Kim, Chang-Seok

doi:10.3390/s140916109

Cited by 16 publications

(6 citation statements)

References 19 publications

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“…The frequently used NDE techniques for delamination detection associated with sensing equipment can be classified into six following groups: (a) thermographic inspection mainly including Eddy-current thermography, pulsed thermography, step thermography, lock-in thermography, and vibrothermography; (b) piezoelectric inspection including piezoelectric sensors; (c) optical interferometric inspection [11] involving two classes, i.e., camera based interferometry such as moiré interferometry, speckle pattern interferometry, holography and shearography, and detector-based interferometry such as scanning laser Doppler vibrometer and fiber Bragg grating (FBG) sensors [12]; (d) electromagnetic testing including radiography, computed tomography, Terahertz (THz) spectroscopy, and electrode strips; (e) ultrasonic testing usually incorporating a couplant medium including electromagnetic acoustic transducers, air-coupled transducers, ultrasonic C-scan testing, and phased array ultrasonic transducer; and, finally, (f) visual inspection including microscopy.…”

Section: Nde Techniquesmentioning

confidence: 99%

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Askaripour

Żak

2019

J. Compos. Sci.

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Scrutinizing delaminated composites is extensively conducted based on measurements of various types of nondestructive sensing apparatus, classified herein as systems of thermographic inspection, piezoelectric inspection, optical interferometric inspection, electromagnetic testing, ultrasonic testing, and visual testing. The development of the subject has been reviewed during 2000–2017. Not only does the substantial corresponding literature strongly indicates numerous increasing industrial demand for composites, including carbon fiber-reinforced polymer, glass fiber-reinforced polymer, and fiber-reinforced metal laminate, but also the significant potential of composites to delaminate when subjected particularly to impact, machining operation or manufacturing imperfections. Conducting a study on the corresponding literature, the subject of delamination inspection within composites is found to be a dynamic, mature field, while lacking a thorough literature review. Therefore, the present study addresses the mentioned gap regarding various sensation systems utilized so as to detect internal anomalies in composites for the review arrangement. To that end, the literature inclusion in terms of citation times is electronically adopted associated with an appropriate combination of keywords. The study may be considered as a comprehensive, up-to-date review covering all delamination inspection techniques founded on sensation systems, thus benefiting the readers with information in an organized configuration.

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Section: Nde Techniquesmentioning

confidence: 99%

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

Askaripour

Żak

2019

J. Compos. Sci.

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“…A wavelength-swept laser (WSL) has been developed [12,13,14,15,16,17,18,19,20,21,22,23,24] as a promising optical source to overcome these problems in FBG interrogation because of its advantages in terms of speed, resolution, and SNR. In particular, a laser source with a high swept rate of over 10 kHz has a wide range of applications in real-time FBG sensor systems [19].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, a characterization step of current calibration is required for a linear output, which makes the systems more complicated. In Reference [23], a linearized wavelength swept thermo-optic laser chip was proposed for an FBG interrogation system. Its linearity of wavelength-time fitting was 0.99994, which is the highest linearity currently reported to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

A Fast Linearly Wavelength Step-Swept Light Source Based on Recirculating Frequency Shifter and Its Application to FBG Sensor Interrogation

Yuan

Wang

Song

et al. 2019

Sensors

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A wavelength step-swept light source (WSSL) using a recirculating frequency shifter loop (RFSL) based on a single-side-band (SSB) modulator is proposed, in order to achieve a linear and fast wavelength-sweeping. The swept step can be tuned from 1.2 pm to 128 pm by adjusting a precise and stable radio frequency (RF) signal that is applied to the SSB modulator. The swept rate can be tuned up to 99 kHz in a range of over 5.12 nm. Wavelength-to-time mapping is used to measure static strain-induced or temperature-induced shifting of the reflected central wavelength of a fiber Bragg grating (FBG). Because of the high linearity of the light source, the interrogation linearity of the strain and the temperature are as high as 0.99944 and 0.99946, respectively. When a dynamic periodic strain applied to FBG sensor, the dynamic performance of the FBG sensor is successfully recorded in the time domain and its power spectral density of a fast Fourier transform (FFT) is calculated. The signal-to-noise ratio (SNR) of the power spectral density is over 40 dB for a 100 Hz dynamic strain and the calculated sensitivity is 0.048 με/Hz1/2. A sharp change in the strain frequency from 100 Hz to 500 Hz is captured in real time.

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“…Precise measurement of the FBG wavelength shift induced by the measurement is crucial for achieving good sensor performance. The general requirements for an ideal interrogation method are as follows: high resolution with a large measurement range, cost effective, and compatible with multiplexing [16][17][18]. The demodulation techniques are divided into two categories based on the light source, which is either broadband (e.g.…”

Section: Introductionmentioning

confidence: 99%

Novel method of dual fiber Bragg gratings integrated in fiber ring laser for biochemical sensors

Bui

Pham

Nguyen

et al. 2018

Meas. Sci. Technol.

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Optical sensors have been shown to be very effective for measuring the toxic content in liquid and air environments. Optical sensors, which operate based on the wavelength shift of the optical signals, require an expensive spectrometer. In this paper, we propose a new configuration of the optical sensor device for measuring wavelength shift without using a spectrometer. This configuration has a large potential for application in biochemical sensing techniques, and comes with a low cost. This configuration uses dual fiber Bragg gratings (FBGs) integrated in a fiber ring laser structure of erbium-doped fiber, in which one FBG is used as a reference to sweep over the applicable spectrum of the etched-Bragg grating. The etched-FBG as a sensing probe is suitable for bio- and/or chemical sensors. The sensitivity and accuracy of the sensor system can be improved by the narrow linewidth of emission spectra from the laser, the best limit of detection of this sensor is 1.5 × 10−4 RIU (RIU: refractive index unit), as achieved by the optical sensor using a high resolution spectrometer. This sensor system has been experimentally investigated to detect different types of organic compounds, gasoline, mixing ratios of organic solvents in gasoline, and nitrate concentration in water samples. The experimental results show that this sensing method could determine different mixing ratios of organic solvents with good repeatability, high accuracy, and rapid response: e.g. for ethanol and/or methanol in gasoline RON 92 (RON: research octane number) of 0%–14% v/v, and nitrate in water samples at a low concentration range of 0–50 ppm. These results suggest that the proposed configuration can construct low-cost and accurate biochemical sensors.

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A Fiber Bragg Grating Sensor Interrogation System Based on a Linearly Wavelength-Swept Thermo-Optic Laser Chip

Cited by 16 publications

References 19 publications

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

A Survey of Scrutinizing Delaminated Composites via Various Categories of Sensing Apparatus

A Fast Linearly Wavelength Step-Swept Light Source Based on Recirculating Frequency Shifter and Its Application to FBG Sensor Interrogation

Novel method of dual fiber Bragg gratings integrated in fiber ring laser for biochemical sensors

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