Dr. Sourabh Roy Profile

Dr. Sourabh Roy

Professor at National Institute of Technology Warangal

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Publications (7)

Proceedings Article | 18 June 2024 Poster + Paper

Deep learning-based macro-bending loss detection by plastic optical fiber specklegram analysis

Nikhil Vangety, Sourabh Roy

Proceedings Volume 13017, 130170U (2024) https://doi.org/10.1117/12.3015912

KEYWORDS: Phase only filters, Matrices, Education and training, Polymer optical fibers, Deep learning, Convolutional neural networks, Image processing, Visual process modeling, Performance modeling, Microscopes

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SPIE Journal Paper | 28 December 2022

Analyzing specklegrams of plastic optical fiber using convolutional neural network for weight recognition

Nikhil Vangety, Koustav Dey, Surya Ghosh, Sourabh Roy

OE, Vol. 61, Issue 12, 126112, (December 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.12.126112

KEYWORDS: Education and training, Polymer optical fibers, Convolutional neural networks, Mathematical optimization, Data modeling, CCD cameras, Matrices, Phase only filters, Performance modeling, Optical engineering

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A weight recognition scheme is proposed based on the analysis of plastic optical fiber (POF) specklegrams. A simple experiment is performed for data acquisition comprising specklegram images corresponding to different external applied weights ranging from 0 to 3 kg in steps of 0.5 kg on the POF. These specklegram images are further split into training, validation, and test datasets for employment in the convolutional neural network (CNN). The model is trained and validated with a sufficient number of epochs (iterations) to obtain optimal training and validation accuracies (>90 % ); it is then used for recognizing (classifying) the unseen test dataset images. A user-defined CNN model is optimized using four different optimizers: Adam, AdaMax, Nadam, and RMSProp. The recognition (or test) accuracy of these optimizers is compared. The Nadam optimizer has the highest recognition accuracy of 93.1% for increasing weights and 91.9% for decreasing weights. Furthermore, we investigate the impact of two parameters, namely temperature effect and information loss of specklegrams, on the model’s weight recognition accuracy. The temperature effect is studied for finite temperatures ranging from 29°C to 35°C with 3°C step fluctuations around the ambient temperature of 25°C. We find that the maximum deviation in recognition accuracy is about 1.2%. To quantify the information content (speckles) in each blocked specklegram, Shannon entropy (SE) is estimated. These images are then used in our existing CNN model with the Nadam optimizer to evaluate recognition performance with blocking. With increasing blocking, we observe a decrease in SE and recognition accuracy. This analysis suggests that, even with information loss in the specklegrams at ≤20 % blocking, a good representation of weights with high recognition accuracy (>80 % ) can be obtained. The presence of a small physical obstacle in front of the imaging system can cause information loss in specklegrams to manifest in practical scenarios.

Proceedings Article | 1 April 2020 Presentation + Paper

Interrogation of SMS for measuring of temperature and strain using half-etched FBG with enhanced sensitivity

Koustav Dey, V. D. Pavan, Sourabh Roy, Sai Shankar M., B. Ramesh

Proceedings Volume 11355, 113550Z (2020) https://doi.org/10.1117/12.2555327

KEYWORDS: Fiber Bragg gratings, Temperature metrology, Sensors, Etching, Fiber optics sensors, Cladding, Fabrication, Multimode fibers, Fusion splicing, Remote sensing

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SPIE Journal Paper | 22 January 2019

Poincare sphere representation for vector vortex modes of a few-mode fiber

C. Hari Krishna, Sourabh Roy

OE, Vol. 58, Issue 01, 016109, (January 2019) https://doi.org/10.1117/12.10.1117/1.OE.58.1.016109

KEYWORDS: Polarization, Picosecond phenomena, Optical spheres, Optical fibers, Optical engineering, Dielectric polarization, Wave plates, Particles, Physics, Nonlinear optics

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Proceedings Article | 7 September 2018 Paper

Spirally polarized OAM beam generation in few-mode fiber

Hari Krishna C., V. D. R. Pavan, Sourabh Roy

Proceedings Volume 10723, 107232K (2018) https://doi.org/10.1117/12.2320258

KEYWORDS: Polarization, Optical fibers

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Proceedings Article | 29 April 2016 Paper

Dual POF and prism sensor for liquid concentration measurement based on hysteresis area

P. V. N. Kishore, Nishath Ashfak Shaikh, Sourabh Roy, M. Sai Shankar, Putha Kishore

Proceedings Volume 9899, 989921 (2016) https://doi.org/10.1117/12.2226022

KEYWORDS: Sensors, Liquids, Prisms, Fiber optics sensors, Refractive index, Polymer optical fibers, Fiber optics sensors, Water, Modulation, Fiber optics

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Proceedings Article | 15 June 2015 Paper

Comparative photonic bandgap analysis on square and triangular lattice photonic crystal slabs

Hari Krishna, V. D. Pavan, Sourabh Roy

Proceedings Volume 9654, 96541E (2015) https://doi.org/10.1117/12.2181774

KEYWORDS: Photonic crystals, Gallium arsenide, Dispersion, Semiconductors, Waveguides, Light wave propagation, Radio propagation, Polarization, Photonic crystal devices, Semiconductor lasers

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Showing 5 of 7 publications

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