A FBG Intensity Modulation System Combined with an Optical Whispering Gallery Mode Edge Filter

Wang, Shengfeng; Chen, Tao-Hsing; Tsai, Liren; Huang, Chien‐Chang; Chiang, Chia‐Chin

doi:10.3390/app6040092

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…The first-order lag filter is employed to smooth the original signal accomplished by linear combination of current and previous values, as (2) presents. When  takes different values, n y varies with the change in  , and the effect of n y is indicated in Fig.…”

Section: First-order Lag Filtermentioning

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%

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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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Section: First-order Lag Filtermentioning

confidence: 99%

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 the process of large-scale FBG networking (usually 0.1 dB loss with one welding joint). What’s more, the low reflectivity (<−30 dB) of weak FBGs effectively suppresses the accumulative noise, including the spectrum effect of shadow and the crosstalk between sensing cells [ 4 , 5 ]. However, as the capacity of sensing cells becomees larger and larger, the speed of FBG interrogation, especially with respect to gaining access to any given sensing cell along the fiber array, has become the main factor affecting the performance and application of FBG sensing systems [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

High-Speed Interrogation for Large-Scale Fiber Bragg Grating Sensing

Bai

2018

Sensors

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A high-speed interrogation scheme for large-scale fiber Bragg grating (FBG) sensing arrays is presented. This technique employs parallel computing and pipeline control to modulate incident light and demodulate the reflected sensing signal. One Electro-optic modulator (EOM) and one semiconductor optical amplifier (SOA) were used to generate a phase delay to filter reflected spectrum form multiple candidate FBGs with the same optical path difference (OPD). Experimental results showed that the fastest interrogation delay time for the proposed method was only about 27.2 us for a single FBG interrogation, and the system scanning period was only limited by the optical transmission delay in the sensing fiber owing to the multiple simultaneous central wavelength calculations. Furthermore, the proposed FPGA-based technique had a verified FBG wavelength demodulation stability of ±1 pm without average processing.

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Development and implementation of a dynamic force measurement system for automatic tool changer system and drawbar mechanism in machining center

Huo

et al. 2021

Int J Adv Manuf Technol

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Automatic tool changer system (ATCS) and drawbar mechanism (DM) are two of key basic parts in machining centers for realizing automatic tool-changing cycle. In the condition monitoring, fault diagnosis and failure warning of the ATCS and DM, the dynamic force is an important characteristic signal. However, there is little research about the specific dynamic force measurement system in this regard. Thus, a novel dynamic force measurement system (DFMS) is developed and implemented. Based on the BT40 toolholder, a resistance strain gauge-based force senor is used to convert the dynamic force signal into electrical signal. The real-time dynamic force acquiring system is controlled via an 8-bit RISC microcontroller. Digital measurements are obtained from the 24-bit sigma-delta analog-to-digital converter with a programmable gain array, which then are transmitted to the upper computer software via a wireless transceiver for display and storage. Finally, a Teager energy operator based dual-threshold two sentences endpoint detection method is proposed to extract the maximum dynamic force and the duration time. Experimental results show that the DFMS is reliable and can be easily used to detect the dynamic force for the ATCS and DM.

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A FBG Intensity Modulation System Combined with an Optical Whispering Gallery Mode Edge Filter

Cited by 7 publications

References 14 publications

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

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

High-Speed Interrogation for Large-Scale Fiber Bragg Grating Sensing

Development and implementation of a dynamic force measurement system for automatic tool changer system and drawbar mechanism in machining center

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