Comparative Analysis of the Methods for Fiber Bragg Structures Spectrum Modeling

Agliullin, T. A.; Anfinogentov, Vladimir; Morozov, Oleg G.; Sakhabutdinov, A. Zh.; Valeev, Bulat; Niyazgulyeva, Ayna; Garovov, Yagmyrguly

doi:10.3390/a16020101

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…6(a) ]. 80 – 82 This phase jump leads to a narrow spectral notch at the center of the reflection bandwidth of the grating, allowing highly sensitive ultrasonic detection. 83 – 85 …”

Section: Optical Sensor Technology In Pa Imagingmentioning

confidence: 99%

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Optical ultrasound sensors for photoacoustic imaging: a review

Zhu,

Cao,

et al. 2024

J. Biomed. Opt.

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. Significance Photoacoustic (PA) imaging is an emerging biomedical imaging modality that can map optical absorption contrast in biological tissues by detecting ultrasound signal. Piezoelectric transducers are commonly used in PA imaging to detect the ultrasound signals. However, piezoelectric transducers suffer from low sensitivity when the dimensions are reduced and are easily influenced by electromagnetic interference. To avoid these limitations, various optical ultrasound sensors have been developed and shown their great potential in PA imaging. Aim Our study aims to summarize recent progress in optical ultrasound sensor technologies and their applications in PA imaging. Approach The commonly used optical ultrasound sensing techniques and their applications in PA systems are reviewed. The technical advances of different optical ultrasound sensors are summarized. Results Optical ultrasound sensors can provide wide bandwidth and improved sensitivity with miniatured size, which enables their applications in PA imaging. Conclusions The optical ultrasound sensors are promising transducers in PA imaging to provide higher-resolution images and can be used in new applications with their unique advantages.

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“…6(a) ]. 80 – 82 This phase jump leads to a narrow spectral notch at the center of the reflection bandwidth of the grating, allowing highly sensitive ultrasonic detection. 83 – 85 …”

Section: Optical Sensor Technology In Pa Imagingmentioning

confidence: 99%

“…6(a)]. [80][81][82] This phase jump leads to a narrow spectral notch at the center of the reflection bandwidth of the grating, allowing highly sensitive ultrasonic detection. [83][84][85] The imaging systems based on π-FBG have been successfully applied in PA imaging.…”

Section: Fiber Laser Sensormentioning

confidence: 99%

Optical ultrasound sensors for photoacoustic imaging: a review

Zhu,

Cao,

et al. 2024

J. Biomed. Opt.

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“…Let us reduce (11) to the lower triangular form and obtain the dependence of the reflection coefficient on the length L of the Fabry-Perot interferometer, determined by solving Equation (8), and the permittivity and permeability of the layers: Let us write down the conditions determining the continuity of propagation in the electric and magnetic waves, which consists of the equality of these fields at each of the boundaries of the medium interfaces at z = 0 and at z = L. We consider that all the radiation that approached the boundary z = 0 entirely falls on it (t 1 = 1), and all the radiation that passed through the boundary z = L is not reflected back (r 3 = 0). We obtain a complete system of four linear equations with respect to four unknown variables r 1 , t 2 , r 2 , t 3 ; the reflection and transmission coefficients are [43]:…”

Section: Mathematical Model Of the Sensormentioning

confidence: 99%

Fiber-Optic Hydraulic Sensor Based on an End-Face Fabry–Perot Interferometer with an Open Cavity

Morozov,

Agliullin,

Sakhabutdinov

et al. 2023

Photonics

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The paper describes the design and manufacturing process of a fiber optic microphone based on a macro cavity at the end face of an optical fiber. The study explores the step-by-step fabrication of a droplet-shaped macro cavity on the optical fiber’s end surface, derived from the formation of a quasi-periodic array of micro-cavities due to the fuse effect. Immersing the end face of an optical fiber with a macro cavity in liquid leads to the formation of a closed area of gas where interfacial surfaces act as Fabry–Perot mirrors. The study demonstrates that the macro cavity can act as a standard foundational element for diverse fiber optic sensors, using the droplet-shaped end-face cavity as a primary sensor element. An evaluation of the macro cavity interferometer’s sensitivity to length alterations is presented, highlighting its substantial promise for use in precise fiber optic measurements. However, potential limitations and further research directions include investigating the influence of external factors on microphone sensitivity and long-term stability. This approach not only significantly contributes to optical measurement techniques but also underscores the necessity for the continued exploration of the parameters influencing device performance.

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“…A better understanding of the optical breakdown process in the fiber will make it possible to create intrafiber devices with reasonably good repeatability of the characteristics. For example, the article [25] describes methods for modeling the spectrum structure of a Bragg reflector in a fiber. Alternatively, it will improve the signal processing methods in them [26].…”

Section: The Solution Algorithmmentioning

confidence: 99%

Mathematical Model of Fuse Effect Initiation in Fiber Core

et al. 2023

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This work focuses on the methods of creating in-fiber devices, such as sensors, filters, and scatterers, using the fiber fuse effect. The effect allows for the creation of structures in a fiber core. However, it is necessary to know exactly how this process works, when the plasma spark occurs, what size it reaches, and how it depends on external parameters such as power and wavelength of radiation. Thus, this present study aims to create the possibility of predicting the consequences of optical breakdown. This paper describes a mathematical model of the optical breakdown initiation in a fiber core based on the thermal conductivity equation. The breakdown generates a plasma spark, which subsequently moves along the fiber. The problem is solved in the axisymmetric formulation. The computational domain consists of four elements with different thermophysical properties at the boundaries of which conjugation conditions are fulfilled. The term describing the heat source in the model is determined by the wavelength of radiation and the refractive indices of the core and the shell and also includes the radiation absorption on the released electrons during the thermal ionization of the quartz glass. The temperature field distributions in the optical fiber are obtained. Based on the calculations, it is possible to estimate the occurrence times of various phase states inside the fiber, in particular, the plasma spark occurrence time.

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Comparative Analysis of the Methods for Fiber Bragg Structures Spectrum Modeling

Cited by 12 publications

References 19 publications

Optical ultrasound sensors for photoacoustic imaging: a review

Optical ultrasound sensors for photoacoustic imaging: a review

Fiber-Optic Hydraulic Sensor Based on an End-Face Fabry–Perot Interferometer with an Open Cavity

Mathematical Model of Fuse Effect Initiation in Fiber Core

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