Impact of Pulse Width on the Sensitivity and Range of a Raman-based Distributed Fiberoptic Temperature Sensor

Silva, Marianne S. P. e; Alves, Henrique Patriota; Nascimento, Jehan Fonsêca do; Martins-Filho, Joaquim F.

doi:10.1590/2179-10742018v17i41542

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…The results in Table 1 showed a compound influence of pixel size and scanning time on FOV size; this is in good agreement with that observed in [24][25][26] who also suggested an inverse relationship between the viewing size and spatial resolution. Other factors that could influence spatial resolution performance of a PA imaging system include magnification of focal spot [27] and the light beam pulse width [28]. A shorter pulse width is reported to produce an improved spatial resolution image [29], which is supported by the observations in the results from [26] [10] 136 ns [11] 5 ns [23] Since light scattering and absorbing (optical properties) in a turbid medium (e.g.…”

mentioning

confidence: 73%

Photoacoustic technology for biological tissues characterization

Chua

Huong

2020

Bulletin EEI

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The existing photoacoustics (PA) imaging systems showed mixed performance in imaging characteristic and signal-to-noise ratio (SNR). This work presents the use of an in-house assembled PA system using a modulating laser beam of wavelength 633 nm for two-dimensional (2D) characterization of biological tissues. The differentiation of the tissues in this work is based on differences in their light absorption, wherein the produced photoacoustic signal detected by a transducer was translated into phase value that corresponds to the peak amplitude of optical absorption of tissue namely fat, liver and muscle. This work found fat tissue to produce the strongest PA signal with mean ± standard deviation (SD) phase value = 2.09 ± 0.31 while muscle produced the least signal with phase value = 1.03 ± 0.17. This work discovered the presence of stripes pattern in the reconstructed images of fat and muscle resulted from their structural properties. In addition, a comparison is made in an attempt to better assess the performance of the developed system with the related ones. This work concluded that the developed system may use as an alternative, noninvasive and label-free visualization method for characterization of biological tissues in the future.

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mentioning

confidence: 73%

Photoacoustic technology for biological tissues characterization

Chua

Huong

2020

Bulletin EEI

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“…They can measure temperatures of up to 300 degrees Celsius per meter [90]. Using conventional OTDRs, a range of approximately 15 kilometres can be obtained for the DTS [91]. The DTS resolves both its temporal and spatial temperatures at 0.1 degrees Celsius.…”

Section: Distributed Temperature Sensing (Dts)mentioning

confidence: 99%

Optical Fibre-Based Sensors for Oil and Gas Applications

Johny

Amos

Prabhu

2021

Sensors

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Oil and gas (O&G) explorations moving into deeper zones for enhanced oil and gas recovery are causing serious safety concerns across the world. The sensing of critical multiple parameters like high pressure, high temperature (HPHT), chemicals, etc., are required at longer distances in real-time. Traditional electrical sensors operate less effectively under these extreme environmental conditions and are susceptible to electromagnetic interference (EMI). Hence, there is a growing demand for improved sensors with enhanced measurement capabilities and also sensors that generates reliable data for enhanced oil and gas production. In addition to enhanced oil and gas recovery, the sensing technology should also be capable of monitoring the well bore integrity and safety. The sensing requirements of the O&G industry for improved sensing in deeper zones include increased transmission length, improved spatial coverage and integration of multiple sensors with multimodal sensing capability. This imposes problems like signal attenuation, crosstalks and cross sensitivities. Optical fibre-based sensors are expected to provide superior sensing capabilities compared to electrical sensors. This review paper covers a detailed review of different fibre-optic sensing technologies to identify a feasible sensing solution for the O&G industry.

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“…As such, it is suitable for use in highly controlled environments such as nuclear or chemical plants [7]. Currently, optical fiberbased sensors are used to monitor various physical and chemical properties such as humidity [8], microbends [9], [10], electric field [11], [12], temperature [13], [14], pressure [ 15], magnetic field [16], gas [17], [18], corrosion [19]- [21] among others.…”

Section: Corrosion Sensor Using Metallic Doublementioning

confidence: 99%

Corrosion Sensor Using Metallic Double Layer in Optical Fiber

Oliveira

Silva

Alves

et al. 2021

J. Microw. Optoelectron. Electromagn. Appl.

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In this paper, a new optical fiber corrosion sensor based on metallic bilayers is described. The detection region is located at a fiber end facet and we present simulations as well as experimental results in controlled lab conditions for Ti(10 nm)/Al(10 nm) and Ni(5 nm)/Al(5 nm) bilayers. We perform the characterization of the device by numerical simulations using the COMSOL Multiphysics software, and with an analytical model, which makes use of the Fresnel equations. According to the simulations, the change in the reflected optical signal over time is related to variations in the thickness of the metallic films by the corrosive process and, consequently, the corrosion rate in each metal of the bilayer can be obtained. Upon the simulation results, sensor devices were fabricated by depositing thin metallic films on the cleaved facet of the optical fiber using the sputtering method. We show that the use of a metallic bilayer as a transducer, instead of a monolayer, improves the sensor measuring interval (20 ± 1 nm) and provides information about the corrosion rate along the corrosion process.

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Impact of Pulse Width on the Sensitivity and Range of a Raman-based Distributed Fiberoptic Temperature Sensor

Cited by 9 publications

References 15 publications

Photoacoustic technology for biological tissues characterization

Photoacoustic technology for biological tissues characterization

Optical Fibre-Based Sensors for Oil and Gas Applications

Corrosion Sensor Using Metallic Double Layer in Optical Fiber

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