Inner filter effect mediated red-shift in synchronous and total synchronous fluorescence spectra as a tool to monitor quality of oils and petrochemicals

Panigrahi, Suraj Kumar; Mishra, Ashok Kumar

doi:10.1016/j.fuel.2020.117174

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…However, this did not happen. This confirmed the formation of newer molecular groups, which was responsible for the progressive redshift of the absorption peaks [ 32 , 33 ], as shown in Figure 4 b. The absorption rate of electromagnetic radiation by a sample is proportional to the amount of the substances present in the sample.…”

Section: Resultssupporting

confidence: 54%

“…The shift towards the higher wavelength was due to the increase in the concentration of the oil and the aggregation of the contaminants, which can be attributed to the collisional energy transfer, the fluorescent quenching, and the inner filter effect [ 32 , 33 ]. The progressive redshift and the intensity reduction in the peak at 513 nm suggested the optical densification as a result of the increase in the contaminant concentration.…”

Section: Resultsmentioning

confidence: 99%

“…The progressive redshift and the intensity reduction in the peak at 513 nm suggested the optical densification as a result of the increase in the contaminant concentration. This was due to the variations in the aromatic polar–polycyclic hydrocarbons degraded to molecular fragments with different masses and the inner filter effect [ 32 ]. Thus, the redshift observed in the UV-Vis spectra, as well as the PL spectra, was a direct indication of the degradation of the fresh engine oil.…”

Section: Resultsmentioning

confidence: 99%

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Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

et al. 2023

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Ageing of engine oil is an important issue determining the engine life and performance. The present work attempts to delineate the ageing-induced changes in engine oil through the mode-mismatched dual-beam thermal lens (MMDBTL) technique and other conventional spectroscopic techniques. For the analyses, engine oil samples were collected after every 200 km of runtime. As the thermal diffusivity is related to the nonradiative deexcitation upon optical absorption, comprehensive radiative and nonradiative analyses were carried out. The Ultraviolet-Visible, Fourier transform infrared, and Nuclear magnetic resonance spectroscopic analyses point to the structural modification as a result of the breaking of the long-chain hydrocarbons into ketones, aldehydes, esters, and other compounds. This modifies the absorption pattern, which can also be understood from the nonlinear refractive index study using the Z-scan technique. The compositional variations associated with the degradation upon ageing, the length of the hydrocarbon chain, and the formation of newer molecules account for the enhancement of the thermal diffusivity revealed through the MMBDTL techniques. The complementary nature of the radiative and nonradiative emission is understood from the fluorescence study. Thus, the study reveals the possibility of thermal diffusivity measurement as an effective tool for the quality monitoring of engine oil.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

et al. 2023

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“…However, in Figure 1, apart from three peaks whose intensity is constantly weakening, no new peaks have emerged. This phenomenon can be explicated by the inner filter effect of fluorescence [16] . Transformer oil is a complex mixture containing various aromatic hydrocarbons with disparate fluorescence properties.…”

Section: Hydrocarbon Group Composition Analysismentioning

confidence: 99%

Effect of thermal ageing on the fluorescence characteristics of mineral transformer oil for EMU

Zhao,

Shi,

Liu

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target Recognition

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Detecting oil leakage faults in traction transformers is critical to Electrical Multiple Unit (EMU) operation fault detection. Mineral transformer oil, which exhibits fluorescence characteristics, is commonly employed in EMU traction transformers. The position and intensity of the fluorescence characteristic peaks determine the selection of excitation light source wavelength and imaging spectral band for the mineral transformer oil leakage detection technology based on fluorescence imaging. However, the fluorescence characteristics will change with ageing. To investigate the changes in the fluorescence characteristics of mineral transformer oil used in EMU during the ageing process, accelerated thermal ageing experiments were conducted in the laboratory. The three-dimensional fluorescence spectra of samples were collected regularly. Furthermore, the hydrocarbon group composition and interfacial tension of the samples were routinely detected, with the intent of unraveling the underlying factors contributing to the variations observed in the fluorescence spectra. The results show that the position of the fluorescence spectrum peak gradually shifts to the long-wave direction with the prolongation of the ageing time, and the intensity of the peak continuously decreases. The experimental results offer the experimental and data foundation for the selection of excitation light source wavelength and imaging spectral band in the application of fluorescence imaging detection technology to detect oil leakage faults in mineral transformers of EMU.

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“…4 represents the emission intensity of fluorophore (punga oil). The unsaturated fatty acids and chemical structure of punga oil [26] acts as a primary source of fluorescence behaviour, where its emission and excitation wavelength are observed in the range of 500-850 nm and 500-650 nm. The fluorescent fiber used for corona discharge studies of punga oil must contain its absorption and emission peak confining to these spectral wavelengths.…”

Section: A Steady State Excitation Emission Matrix Of Punga Oilmentioning

confidence: 99%

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

Murugesan¹,

Amalanathan

Sarathi

et al. 2021

IEEE Access

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This paper reports the experimental investigation of the corona discharge activity of punga oil under the influence of a local magnetic field and different voltage profiles (AC and DC voltages) using fluorescent fiber sensor as well as UHF sensor technique. The corona inception voltage (CIV) of punga oil is higher under negative DC voltage followed by positive DC and AC voltage, with a marginal reduction in its CIV magnitude observed on the impact of external magnetic field. The dominant frequency of the UHF signal obtained under AC voltage shifted towards lower frequency (0.6 GHz) with the influence of magnetic flux density to about 85 mT. The rise time, pulse width and energy content of the fluorescent signal formed due to corona activity under AC voltage is found to vary under high magnetic fields confirming the inception results. The fluorescent signals formed due to corona discharge under both AC and DC voltages has its dominant frequency at 1 MHz with no shift observed in the presence of magnetic field. Also, there is no variation in the phase resolved partial discharge (PRPD) pattern observed due to corona discharge (with and without magnetic field) signal using both UHF sensor and the fluorescent sensor. The fluorescent fiber-based technique provides a better accuracy on detecting the corona discharges in punga oil at an early stage compared to conventional UHF sensor. The breakdown voltage of punga oil under different voltage profiles with and without the effect of magnetic field follows normal distribution. The dielectric dissipation factor and electrostatic charging tendency (ECT) of punga oil is observed to be higher than the limit set for insulating fluids towards power transformer operation.INDEX TERMS corona discharge, magnetic field, fluorescent fiber, UHF sensor, rise time, streaming current.

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Inner filter effect mediated red-shift in synchronous and total synchronous fluorescence spectra as a tool to monitor quality of oils and petrochemicals

Cited by 15 publications

References 33 publications

Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

Reflecting the Quality Degradation of Engine Oil by the Thermal Diffusivity: Radiative and Nonradiative Analyses

Effect of thermal ageing on the fluorescence characteristics of mineral transformer oil for EMU

Investigation on Impact of Magnetic Field on the Corona Discharge Activity in Punga Oil Using Fluorescent Fiber and UHF Sensor Techniques

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