Optical low-coherence reflectometry for a distributed sensor array of fiber Bragg gratings

Liu, Weisheng; Guan, Zuguang; Liu, Guorong; Yan, Chunsheng; He, Sailing

doi:10.1016/j.sna.2008.01.002

Cited by 13 publications

(3 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OFS offers many strengths, such as immunity to electromagnetic interference, high sensitivity, robustness, and flexibility [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. The application of OFS begins with single-point sensing, which is hard to implement in a long-distance monitoring scenario [ 11 , 12 , 13 ]. As a comparison, distributed optical fiber sensors (DOFSs) take advantage of the sensing ability of optical fiber, that is, deriving all the information along the fiber.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Distributed Optical Fiber Sensor for the Multi-Parameter Measurements

Zhou

Wang

Yang

et al. 2023

Sensors

View full text Add to dashboard Cite

Distributed optical fiber sensors (DOFSs) are a promising technology for their unique advantage of long-distance distributed measurements in industrial applications. In recent years, modern industrial monitoring has called for comprehensive multi-parameter measurements to accurately identify fault events. The hybrid DOFS technology, which combines the Rayleigh, Brillouin, and Raman scattering mechanisms and integrates multiple DOFS systems in a single configuration, has attracted growing attention and has been developed rapidly. Compared to a single DOFS system, the multi-parameter measurements based on hybrid DOFS offer multidimensional valuable information to prevent misjudgments and false alarms. The highly integrated sensing structure enables more efficient and cost-effective monitoring in engineering. This review highlights the latest progress of the hybrid DOFS technology for multi-parameter measurements. The basic principles of the light-scattering-based DOFSs are initially introduced, and then the methods and sensing performances of various techniques are successively described. The challenges and prospects of the hybrid DOFS technology are discussed in the end, aiming to pave the way for a vaster range of applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Hybrid Distributed Optical Fiber Sensor for the Multi-Parameter Measurements

Zhou

Wang

Yang

et al. 2023

Sensors

View full text Add to dashboard Cite

show abstract

“…The intrinsic capability of measuring several parameters, such as temperature, strain, vibration, and many others, is provided by FBG thanks to its spectral shift as a function of these parameters. In recent years, weak FBGs (WFBGs) have drawn immense interest in applications where dense sensing points are required because of their weak reflectivity, which greatly increases the multiplexing capacity and scale of the sensor array [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Speckle-based interrogation system for quasi-distributed weak fiber Bragg gratings

Tao,

Liang,

et al. 2023

Chin. Opt. Lett.

View full text Add to dashboard Cite

A simple quasi-distributed fiber sensing interrogation system based on random speckles is proposed for weak fiber Bragg gratings (WFBGs) in this work. Without using tunable lasers or spectrometers, a piece of multimode fiber is applied to interrogate the WFBGs relying on the wavelength sensitivity of speckles. Instead of the CCD sensor, an InGaAs quadrant detector serves as the receiver to capture the fast-changing speckle patterns. A supervised deep learning algorithm of the multilayer perceptron architecture is implemented to process speckle data and to interrogate temperature changes or dynamic strains. The proposed demodulation system is experimentally demonstrated for WFBGs with 0.1% reflectivity. The experimental results demonstrate that the new system is capable of measuring temperature change with an accuracy of 1°C and achieving dynamic frequency of 100 Hz. This speckle-based interrogation system paves a new way for distributed WFBGs sensing with a simple design.

show abstract

“…But its demodulation speed is limited by the scanning time of vector network analyzer (VNA) and the optical band-pass filter. In addition, the demodulation techniques adopting frequency-shifted interferometry [12], optical low coherent reflection measurement (OLCR) [13], microwave assisted technique [14] and unbalanced Mach-Zehnder interferometer [15] are also reported. However, wavelength scanning or tunable filter still cannot be avoided generally, which induces a slow demodulation speed of FBGs.…”

mentioning

confidence: 99%

High-speed demodulation of weak fiber Bragg gratings based on microwave photonics and chromatic dispersion

Zhou

Xiang

et al. 2018

Opt. Lett.

View full text Add to dashboard Cite

A high-speed demodulation technique based on microwave photonics and chromatic dispersion is proposed for distributed weak fiber Bragg gratings (FBGs). A broadband light modulated with a frequency-swept microwave is reflected by FBGs, and the reflected signal mixes with the original microwave to produce a beat frequency. A dispersion compensation fiber (DCF) changes the beat frequency within the FBG wavelength range. With a crossing microwave sweep, all wavelengths of cascade FBGs can be quickly decoded by measuring the change of the beat frequency. The Chirp-Z + Hanning window algorithm helps to analyze the beat frequency in a single cycle. By adopting the single-peak filter as a reference, the DCF thermal drift can be also eliminated. Therefore, the wavelength detection accuracy is improved, and a higher demodulation speed of 40 kHz can be realized. We have demonstrated 105 FBGs with 0.1% reflectivity and 1 m interval, with the achieved accuracy of 8 pm.

show abstract

Optical low-coherence reflectometry for a distributed sensor array of fiber Bragg gratings

Cited by 13 publications

References 13 publications

Hybrid Distributed Optical Fiber Sensor for the Multi-Parameter Measurements

Hybrid Distributed Optical Fiber Sensor for the Multi-Parameter Measurements

Speckle-based interrogation system for quasi-distributed weak fiber Bragg gratings

High-speed demodulation of weak fiber Bragg gratings based on microwave photonics and chromatic dispersion

Contact Info

Product

Resources

About