Challenges and opportunities in distributed anti-Stokes Raman thermometry

Datta, Amitabha; Sankar, Viswanathan; Srinivasan, Balaji

doi:10.1007/s41683-022-00095-8

Cited by 6 publications

(3 citation statements)

References 115 publications

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“…Therefore, we proposed a novel scheme that only adopts the Raman anti-Stokes light for distributed temperature demodulation. Actually, reference-free distributed anti-Stokes Raman thermometry was also proposed, but it adopts a fiber loop for temperature demodulation [27,28], which shortens the sensing distance to half the length of the fiber loop, and it is also a two-signal channel-based demodulation method. To simplify the system structure and the temperature demodulation algorithm, a new temperature calibration method is proposed, and this new sensing system facilitates integration with other systems based on the OTDR structure.…”

Section: Introductionmentioning

confidence: 99%

A Novel Distributed Optical Fiber Temperature Sensor Based on Raman anti-Stokes Scattering Light

Lu,

Wang,

Liang

et al. 2023

Applied Sciences

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In this paper, a novel distributed optical fiber temperature sensor based on Raman anti-Stokes scattering light is proposed and experimentally demonstrated. The Raman anti-Stokes scattering light is sensitive to temperature parameters that are detected by the fiber under test conditions (FUT), and this allowed the temperature demodulation algorithm to be obtained through the relationship between the temperature and the power of the back-scattered Raman anti-Stokes light. In addition, we propose a new temperature calibration method to ensure accurate temperature measurement, which is greatly affected by the stability of a pulse laser. The experimental system is constructed with an optical fiber length of approximately 3.5 km. The proposed system obtains a 24 dB dynamic range with a pulse width of 20 ns and temperature testing ranges of 30.0 °C to 80.0 °C. The results demonstrate that the maximum temperature deviation range is −1.5 °C to +1.6 °C and the root mean square (RMS) error of the whole temperature range is 0.3 °C, which means it has the potential for practical engineering applications. More importantly, it avoids the walk-off effect that must be corrected in commonly used temperature demodulation schemes adopting both Raman Stokes light and anti-Stokes light. It also saves a signal channel, which is more suitable for the integration of hybrid distributed optical fiber sensing systems for multi-parameter monitoring.

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Section: Introductionmentioning

confidence: 99%

A Novel Distributed Optical Fiber Temperature Sensor Based on Raman anti-Stokes Scattering Light

Lu,

Wang,

Liang

et al. 2023

Applied Sciences

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“…[ 13a ] They have shown that the temperature of overhead power transmission cables can be monitored in real‐time mode through Raman thermometry. [ 13 ] It is worth mentioning that the first attempts to develop synergistic Raman and photoluminescence thermometers have been conducted, but these studies were limited only to the detection of Raman active bands through emission spectroscopy, not direct Raman spectroscopy. [ 14 ]…”

Section: Introductionmentioning

confidence: 99%

“…On the contrary, vibrational features are more ubiquitous in the materials that feature in the research of Balaji Srinivasan et al [13a] They have shown that the temperature of overhead power transmission cables can be monitored in real-time mode through Raman thermometry. [13] It is worth mentioning that the first attempts to develop synergistic Raman and photoluminescence thermometers have been conducted, but these studies were limited only to the detection of Raman active bands through emission spectroscopy, not direct Raman spectroscopy. [14] Raman thermometry works based on the vibrational peak shifts with temperature or by taking the ratio of the Raman band at the anti-Stokes (aS) and Stokes (S) positions.…”

Section: Introductionmentioning

confidence: 99%

Ratiometric Raman and Luminescent Thermometers Constructed from Dysprosium Thiocyanidometallate Molecular Magnets

Kumar

Stefańczyk

Chorąży

et al. 2022

Advanced Optical Materials

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Molecular crystals acting as temperature sensors, designed for multiple measurement techniques, can be a promising pathway for self‐calibrating thermometers. The molecular assemblies [DyxIIIY1–xIII(phen)2(μ‐OH)2(H2O)2]·[AuI(SCN)2]2·phen·0.5MeCN·0.5H2O (x = 0, 0.1, 0.02; phen = 1,10‐phenanthroline) which contain weakly bonded lanthanide(III) and Au(I) metal complexes are reported. They have Raman scattering in the low‐frequency (LF) region with sharp peaks, one of the prerequisites to design Raman thermometers. The Raman thermometric behaviors are characterized by three vibrational bands, and their thermal sensitivity is compared with their emission thermometric ability. The LF phonon linked with the Au···Au vibration helps increase the thermometric sensitivity of emission and Raman thermometers. Additionally, magnetically diluted complexes containing both Dy3+ and Y3+ ions are prepared to demonstrate the effect of temperature sensing capability through Raman and emission spectroscopy among isostructural mixed‐metal materials. Compounds are immersed inside various benchtop solvents to unravel the robustness and functioning of Raman thermometers. Furthermore, they reveal single‐molecule magnet properties, which disclose the effect of LF phonons on the spin relaxation process. Therefore, the reported molecular materials are Raman and luminescent thermometers, and they contain a molecular magnetic center with thiocyanidoaurate ions playing a critical role due to their emissive and Raman activities.

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State-of-The-Art application and challenges of optical fibre distributed acoustic sensing in civil engineering

Ghazali,

Mohamad,

Nasir

et al. 2024

Optical Fiber Technology

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Challenges and opportunities in distributed anti-Stokes Raman thermometry

Cited by 6 publications

References 115 publications

A Novel Distributed Optical Fiber Temperature Sensor Based on Raman anti-Stokes Scattering Light

A Novel Distributed Optical Fiber Temperature Sensor Based on Raman anti-Stokes Scattering Light

Ratiometric Raman and Luminescent Thermometers Constructed from Dysprosium Thiocyanidometallate Molecular Magnets

State-of-The-Art application and challenges of optical fibre distributed acoustic sensing in civil engineering

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