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1. Measurement of dissolved decay products of transformer oil using D‐shaped plastic optical fibre as a sensor.

Author

Razzaq, Alaa, Zainuddin, Hidayat, Hanaffi, Farhan, Chyad, Radhi M., Latiff, Anas A., and Rahim, H.R.A.

Subjects
*INSULATING oils, *ELECTRIC transformers, *THERMAL insulation, *THERMAL stresses, *REFRACTIVE index
Abstract

Transformer oil is widely used in high‐voltage transformers as a cooling and insulation medium. Electrical and thermal stresses expose transformer oil to degradation, which may produce dissolved decay products (DDPs) that are partially adsorbed on the insulation paper and accelerate the degradation of oil and paper. An evanescent field D‐shaped plastic optical fibre (POF) sensor was fabricated using the side‐polishing technique to detect DDPs in transformer oil. A laser light source and power meter were used in the prototype to measure the output power of the POF sensor. The measurement of DDPs was conducted on seven samples of insulating oil collected from the field. The sensor performance was evaluated based on different sensing areas, and the sensor sensitivity was measured. Results show an excellent correlation between the output power and DDPs. A correlation analysis was conducted amongst sensor output power, transformer oil refractive index and area under the absorbance curve. The performance of the sensor demonstrates improved linearity and sensitivity of 97.49% and 26.6779 µW/RIU, respectively. The POF sensor is easily fabricated, low cost and can be used for real‐time monitoring of high‐voltage transformers. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Validation of combined Monte Carlo and photokinetic simulations for the outcome correlation analysis of benzoporphyrin derivative-mediated photodynamic therapy on mice

Author

Timothy C. Zhu, Mary Potasek, Michele M. Kim, Karl W. Beeson, and Evgueni Parilov

Subjects
Paper, solid cancer therapy, Medical device, Porphyrins, medicine.medical_treatment, Monte Carlo method, Biomedical Engineering, Photodynamic therapy, 01 natural sciences, 010309 optics, Biomaterials, chemistry.chemical_compound, Mice, Nuclear magnetic resonance, 0103 physical sciences, medicine, polycyclic compounds, Animals, Computer Simulation, Benzoporphyrin derivative, General, Mice, Inbred C3H, Photosensitizing Agents, Singlet Oxygen, Singlet oxygen, medical device, Reproducibility of Results, Equipment Design, Atomic and Molecular Physics, and Optics, 3. Good health, Electronic, Optical and Magnetic Materials, Light dose, chemistry, Tissue optics, photodynamic therapy, Photochemotherapy, Correlation analysis, Female, Monte Carlo Method
Abstract

We compare previously reported benzoporphyrin derivative (BPD)-mediated photodynamic therapy (PDT) results for reactive singlet oxygen concentration (also called singlet oxygen dose) on mice with simulations using a computational device, Dosie™, that calculates light transport and photokinetics for PDT in near real-time. The two sets of results are consistent and validate the use of the device in PDT treatment planning to predict BPD-mediated PDT outcomes in mice animal studies based on singlet oxygen dose, which showed a much better correlation with the cure index than the conventional light dose.

Published
2019