Browsing by Author "Sangeetha, A."

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Analysis and optimization of uniform FBG structure for sensing and communication applications
(Springer, 2020) Divya Shree, M.; Sangeetha, A.; Krishnan, P.
A uniform fiber Bragg grating sensor is sketched and inspected by the finite-difference time-domain method in furtherance of obtaining ultimate transmission and reflection spectra by optimizing the FBG parameters like refractive index, grating height, grating width, wafer width, wafer length. The maximum transmission power spectrum is achieved as ? 7 dB for the refractive index of 3.005, and the maximum reflection spectra are obtained as 6 dB for the grating height of 1 ?m which is enhanced nine times than the precedent work. The proposed FBG is a simple, light-weight, low-cost uniform structure, and it offers high reflectivity and ease of handling. Therefore, it is highly useful in sensing and communication applications. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.
Design and Analysis of FBG Sensor for Explosive Detection Applications
(2019) Shree, M.D.; Sangeetha, A.; Krishnan, P.
In this paper, a simple uniform fiber Bragg grating (FBG) sensor is designed, and maximum reflection of 7.1 dB at 1.55 ?m is obtained. As this FBG shows a better reflection, it deserves well for the purpose of sensing and communication predominantly as they are resistant to electromagnetic radiations, light weight, low cost, firm size, and ease of handling. The proposed FBG is used for explosive sensing applications to detect explosives like trinitrotoluene (TNT), nitroglycerin, and royal demolition explosive (RDX). The different strain and temperature wavelength shifts of the explosives also analyzed and plotted. 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Design and Analysis of FBG Sensor for Explosive Detection Applications
(Springer, 2020) Shree, M.D.; Sangeetha, A.; Krishnan, P.
In this paper, a simple uniform fiber Bragg grating (FBG) sensor is designed, and maximum reflection of 7.1 dB at 1.55 ?m is obtained. As this FBG shows a better reflection, it deserves well for the purpose of sensing and communication predominantly as they are resistant to electromagnetic radiations, light weight, low cost, firm size, and ease of handling. The proposed FBG is used for explosive sensing applications to detect explosives like trinitrotoluene (TNT), nitroglycerin, and royal demolition explosive (RDX). The different strain and temperature wavelength shifts of the explosives also analyzed and plotted. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Efficient One-Pot Green Synthesis of Chitosan-Copper Bionanoparticles Via Sustainable Hydrothermal Carbonization Route for Photocatalysis and Fenton Studies
(Springer, 2025) Sangeetha, A.; Hariganesh, S.; Kumar, P.; Mishra, A.
A bionanoparticle was fabricated using a facile one-pot green synthesis assisted through Hydrothermal Carbonization and evaluated for its potential as a catalyst in Advanced Oxidation Processes (AOPs) for wastewater treatment. Bio-wastes like onion peel, corn husk and groundnut shell has been employed for green synthesis of Copper-Chitosan bionanoparticles which were characterised for their optical, physical and structural properties with the available technologies to study their composition. The onion peel extract undergone Carbonization along with Chitosan during the Hydrothermal Carbonization process, has augmented the bionanoparticle to function as a visible light active photocatalyst. The synthesized materials were utilized for the degradation of dye and drug using the AOP like Photocatalysis, Fenton-like and Photo-Fenton process. The onion peel extracts aided bionanoparticles excelled in degrading Methylene Blue dye under 15 W LED, achieving 95.9% efficiency in 120 min. Additionally, it functioned as a Fenton-like catalyst, degrading Methylene Blue dye in 60 min with 96.2% efficiency, and as a Photo-Fenton catalyst, achieving 98.1% efficiency in 25 min. Since the catalyst had higher efficiency in short time for Photo-Fenton degradation, it has been optimized by adjusting parameters such as concentration of catalyst and dye, as well for varied pH levels. The catalyst achieved 90.7% efficiency during its fifth stability cycle study. For Rifampicin drug degradation, the observed efficiency was 97.1% in 70 min. This work provides a green way of synthesizing bionanoparticles and its utilization towards the waste water treatment towards degrading the emerging pollutants. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.
Enhancing Smart City Connectivity: Implementing Channel-Adaptive Strategies for FSO-Based Drone-Assisted Mobile Access Networks in Urban Environments
(Institute of Electrical and Electronics Engineers Inc., 2025) Aarthi, G.; Bhargava Kumar, L.; Vaidya, M.; Nema, S.; Krishnan, P.; Sangeetha, A.; Natarajan, R.; Karthikeyan, K.
The global surge in urbanization has catalyzed the evolution of smart city infrastructures, characterized by expansive interconnected networks spanning vast urban landscapes. To address the connectivity challenges inherent in smart city environments, this study advocates for the utilization of autonomous aerial vehicles (AAVs) as an alternative to traditional mobile air base stations. Leveraging Free-Space Optical (FSO) links for downlink transmission from AAVs to users, the proposed system confronts atmospheric turbulence and pointing loss impairments. In this context, the study explores the average spectral efficiency (ASE) performance of the proposed FSO-based Drone-Assisted system employing various channel adaptive techniques, including Optimal Rate Adaptation, Channel Inversion with Fixed Rate, Optimal Power and Rate Adaptation, and Truncated Channel Inversion with Fixed Rate. Additionally, the investigation underscores the impact of factors such as link range, coverage distance, AAV orientation fluctuation standard deviation, AAV position vibration standard deviation, and beam divergence on system performance. By elucidating these aspects, the research aims to contribute valuable insights into the optimization of smart city connectivity, paving the way for enhanced communication infrastructure in urban environments. Notably, the study achieved a maximum ASE of 101 bits/s/Hz using the TIFR adaptation scheme, underscoring the efficacy of the proposed approach. © 2013 IEEE.
Onion Peels Assisted Synthesis of Biofunctionalized CuO Nanoparticles as Nano-Photocatalyst and Nano-Antibiotic
(Springer Science and Business Media Deutschland GmbH, 2024) Sangeetha, A.; Hariganesh, S.; Abarna, B.; Kumar, P.; Ramesh, M.R.; Doddamani, M.
Controlled precipitation of metal oxide via agro waste, providing an eco-friendly synthesis route, was verified through characteristic analysis. CuO nanoparticles were synthesized via the sol-gel method with and without aqueous extract of small onion peels, showcasing their photocatalytic and antibiotic efficacy. Fourier Transform Infrared spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy with Energy Dispersive Analysis (SEM-EDAX) confirmed CuO nanoparticle formation. Brunauer-Emmett-Teller (BET) analysis indicated size reduction in templated CuO nanoparticles. Templated and non-templated CuO nanoparticles exhibited degradation efficiencies of 92% and 83%, respectively, against Crystal Violet dye under sunlight irradiation for 180 min. Minimum concentrations required for Escherichia coli were 75 mcg and 100 mcg for templated and non-templated CuO nanoparticles, respectively, while for Staphylococcus aureus, concentrations were below 25 mcg for both templated and non-templated CuO nanoparticles. This study demonstrates the efficacy of templated CuO nanoparticles synthesized through an eco-friendly route as both nano-photocatalysts and nano-antibiotics. © The Tunisian Chemical Society and Springer Nature Switzerland AG 2024.