Twin-grating fiber optic sensor demodulation

Miridonov, Serguei V.; Shlyagin, Mikhail G.; Tentori, Diana

doi:10.1016/s0030-4018(01)01160-9

Cited by 38 publications

(38 citation statements)

References 15 publications

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“…As for the minimum frequency interval, the crosstalk between different frequency components is the one constraint factor. The FFT spectrum of microstructure is the triangle-shaped peaks27 and the bandwidth of one FFT frequency peak is given by equation (3).…”

Section: Discussionmentioning

confidence: 99%

M-OTDR sensing system based on 3D encoded microstructures

Sun

Liu

et al. 2017

Sci Rep

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In this work, a quasi-distributed sensing scheme named as microstructured OTDR (M-OTDR) by introducing ultra-weak microstructures along the fiber is proposed. Owing to its relative higher reflectivity compared with the backscattered coefficient in fiber and three dimensional (3D) i.e. wavelength/frequency/time encoded property, the M-OTDR system exhibits the superiorities of high signal to noise ratio (SNR), high spatial resolution of millimeter level and high multiplexing capacity up to several ten thousands theoretically. A proof-of-concept system consisting of 64 sensing units is constructed to demonstrate the feasibility and sensing performance. With the help of the demodulation method based on 3D analysis and spectrum reconstruction of the signal light, quasi-distributed temperature sensing with a spatial resolution of 20 cm as well as a measurement resolution of 0.1 °C is realized.

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Section: Discussionmentioning

confidence: 99%

M-OTDR sensing system based on 3D encoded microstructures

Sun

Liu

et al. 2017

Sci Rep

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“…11,12 To obtain high sensitivity measuring the effective refractive index change, and to be able to measure UV-induced attenuation simultaneously, we used in this work three equal Bragg gratings. These gratings form three Fabry-Perot cavities.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of the photosensitivity of optical fiber

Swart

Chtcherbakov

Shlyagin³

et al. 2002

SPIE Proceedings

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This paper presents an experimental study of the photosensitivity of various types of photosensitive optical fiber. A new interferometric technique based on low-finesse fiber Bragg grating Fabry-Perot interferometers allowed the determination of the evolution of the refractive index during exposure to ultra-violet radiation from a KrF excimer laser. It was demonstrated experimentally that enhanced photosensitivity of standard SMF-28 fiber retains after complete outdiffusion of hydrogen. The dependencies of effective refractive index change versus fluence are presented for different photosensitive fibers and hydrogen-loaded fiber.

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“…The position of the spectrum envelope (the Bragg wavelength) can be determined by processing the phases of a few samples representing Fourier image of the optical reflection spectrum. More detailed description of the signal processing for this sensor can be found somewhere else [12]. The algorithm provides high resolution due to evaluation of the phase of cosinusoidal interference pattern.…”

Section: Twin Grating Sensormentioning

confidence: 99%

Static strain measurement with submicro strain resolution and large dynamic range using twin grating Fabry-Perot sensor

Shlyagin¹,

Swart

Miridonov

et al. 2001

SPIE Proceedings

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We present experimental results on testing a twin grating fiber optic sensor for measurement of static strain. The sensor is built with two identical Bragg gratings closely spaced in a single mode fiber. It produces a reflection spectrum modulated due to interference. Similar to traditional FBG sensors, strain of the fiber leads to the wavelength shift of the reflection spectrum. This shift can be determined precisely measuring phase changes for corresponding components of Fourier transform of the reflection spectrum. Such an approach allows an absolute strain measurement with an interferometric sensitivity. Resolution of 0.02ºC and 0.2 ZDV GHPRQVWUDWHG H[SHULPHQWDOO\ IRU WHPSHUDWXUH DQG VWDWLF VWUDLQ PHDVXUHPHQWV using a pair of 0.7mm long Bragg gratings with reflectivity of 1% each.

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Twin-grating fiber optic sensor demodulation

Cited by 38 publications

References 15 publications

M-OTDR sensing system based on 3D encoded microstructures

M-OTDR sensing system based on 3D encoded microstructures

Experimental study of the photosensitivity of optical fiber

Static strain measurement with submicro strain resolution and large dynamic range using twin grating Fabry-Perot sensor

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