Browsing by Author "Ganapathi, K."

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    A Low Temperature Chemiresistive Hydrogen Sensor Based on Pd: Iron Pthalocyanine (FePc) Thin Films
    (Springer Science and Business Media Deutschland GmbH, 2025) Datta, N.; Raj, A.; Ganapathi, K.; Samanta, S.; Kaur, M.
    Energy transition is advancing rapidly, with hydrogen (H2) gas emerging as a leading clean fuel. Various stakeholders are engaged in building H2-compatible infrastructure for production, storage, and transport. Due to H2 gas explosive nature, reliable systems are essential for safe operations. In this context, our group has already developed a Hydrogen Sensor Device (0.5% to LEL working at 150 °C) based on Pd thin film working on Pellister sensing principle. As a step forward, we have investigated Pd modified FePc thin films as low temperature H2 sensor device based on chemiresistive sensing principle. The films were prepared by thermal evaporation of FePc at 200 °C (80 nm, β phase) substrate temperature followed by sputter deposition of Pd film (10 nm). The Pd: FePc films exhibited room temperature (RT) sensing (lowest detection limit of 0.3% H2) with best sensing characteristics at 100 °C (sensitivity 1.4 times for 2% H2 with a response time of 200 s). The sensing behavior may be attributed to the catalytic behavior of Pd in facilitation of oxygen adsorption on low coordinated Fe atoms in FePc. The same is inferred using Kelvin probe studies on pure and Pd modified FePc films. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.
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    Design and implementation of an automatic traffic sign recognition system on TI OMAP-L138
    (2013) Phalguni; Ganapathi, K.; Madumbu, V.; Rajendran, R.; Sumam, David S.
    This paper discusses the design and processor implementation of a system that detects and recognizes traffic signs present in an image. Morphological operators, segmentation and contour detection are used for isolating the Regions of Interest (ROIs) from the input image, while five methods - Hu moment matching, histogram based matching, Histogram of Gradients based matching, Euclidean distance based matching and template matching are used for recognizing the traffic sign in the ROI. A classification system based on the shape of the sign is adopted. The performance of the various recognition methods is evaluated by comparing the number of clock cycles used to run the algorithm on the Texas Instruments TMS320C6748 processor. The use of multiple methods for recognizing the traffic signs allows for customization based on the performance of the methods for different datasets. The experiments show that the developed system is robust and well-suited for real-time applications and achieved recognition and classification accuracies of upto 90%. � 2013 IEEE.
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    Near field communication - Applications and performance studies
    (2012) Akshay, Uttama, Nambi, S.N.; Prabhakar, T.V.; Jamadagni, H.S.; Ganapathi, K.; Pramod, B.K.; Rakesh, C.M.; Sanjay, Naik, R.
    Near Field Communication (NFC), is an integration of Radio Frequency Identification (RFID) technology with mobile devices. NFC offers a quick and convenient method of interaction between humans and NFC enabled devices. Current research concerning NFC appears to mainly focus on development of NFC enabled applications and services. In this paper, we study the performance of NFC devices by considering metrics such as achieved data rates and received power for several distances. Knowledge of these metrics may be useful for application developers to build applications efficiently. We have developed various applications on NFC enabled devices for public transport systems. We also describe the design of 13.56 MHz antenna which was used for measurements of the received power. � 2012 Springer-Verlag.
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    Near field communication - Applications and performance studies
    (2012) Nambi, S.N.; Prabhakar, T.V.; Jamadagni, H.S.; Ganapathi, K.; Pramod, B.K.; Rakesh, C.M.; Sanjay Naik, R.
    Near Field Communication (NFC), is an integration of Radio Frequency Identification (RFID) technology with mobile devices. NFC offers a quick and convenient method of interaction between humans and NFC enabled devices. Current research concerning NFC appears to mainly focus on development of NFC enabled applications and services. In this paper, we study the performance of NFC devices by considering metrics such as achieved data rates and received power for several distances. Knowledge of these metrics may be useful for application developers to build applications efficiently. We have developed various applications on NFC enabled devices for public transport systems. We also describe the design of 13.56 MHz antenna which was used for measurements of the received power. © 2012 Springer-Verlag.