Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Department of Sensor and Biomedical Technology

This paper presents the design and analysis of a multiband Sierpenski carpet fractal antenna operating in the VHF and UHF regions. Common jeans cotton is used as the substrate having a dielectric constant of 1.6 for the design and fabrication of the proposed antenna. The self similarity property of the fractal antenna is utilized for size reduction and multiband operation. Two iterations on the structure provides multiple band operation at 524 MHz, 2.42 GHz, 4.18 GHz and 5.8 GHz respectively and provides maximum gain of 5.01 dB at 4.18 GHz. © 2015 IAMOT.

Department of Communication Engineering

School of Electronics Engineering

Vellore Campus

Electronics

Chennai Campus

International Journal of Microwave and Optical Technology

Design of Sierpenski carpet fractal antenna for body worn applications

A sensor for detecting and estimating methane using multi-walled carbon nanotubes (MWCNTs) as the sensing element has been developed for the first time. Silver electrodes have been ink-jet printed on glass substrate over which MWCNT is brush coated to fabricate the sensor element which is of chemoresistive type. The sensitivity of the sensor (increase in the resistance of the sensor on exposure to analyte) increases linearly with concentration of methane and a maximum sensitivity of about 20% has been observed for 160 ppm of methane. A prototype device has been fabricated with this sensor and tested for its performance. It could be used to detect methane on site. © Indian Academy of Sciences.

Department of Chemistry

School of Advanced Sciences

Fulltext

Bulletin of Materials Science

Detection of methane using multi-walled carbon nanotubes

Measuring the body temperature of patients in prolonged infusion shows drop in core body temperature in accordance with the change in atmospheric conditions like room temperature etc. Babies kept inside the intensive care unit are more prone to the fluctuating temperature, resulting in sequential body temperature drop off. Though intravenous fluid warming system adjusts the fluid to appropriate temperature, it does not take feedback temperature from the patient’s body. Hypothermic conditions might cause serious illness to epileptic babies and the babies under postoperative care. Designing a system, which would addresses this complication is at the urge of distinction. This paper addresses the automatic sensing and cutoff in infusion to prevent the occurrence of such emergency conditions. Temperature sensor is placed at the extremities of the baby. This sensor measures baby’s core body temperature at an hourly interval. The average normal body temperature [‘normal’ varies from babies to babies] is determined initially. Infusion stops and heater goes on when the temperature goes below the set normal temperature. Once the fluid is warmed to a set optimum temperature, infusion occurs. This automated infusion of warmed fluids helps in bringing back the normal body temperature of the babies, thus avoiding emergencies.

VIT Unitversity

7th WACBE World Congress on Bioengineering 2015 IFMBE Proceedings

Automated Infusion Control with Core Body Temperature for Infants Under IV Administration

This paper presents a circuital approach to design a Frequency Selective Surfaces (FSSs) spatial filter. Spatial filter is used to extract the electromagnetic waves in spaces. A conducting sheet perforated with apertures or an array of periodic metallic patches constitute FSSs and it is usually designed to provide four standard spectral response: low-pass, High-pass, band-pass and band-reject. Circuital approach is used to develop a better understanding of FSSs and to attain correct model. A band-pass filter with frequency range from 2GHz-8GHz and band-stop filter with frequency range from 6GHz-13GHz was designed using FSSs. Properties of FSSs are evaluated through simple and accurate equivalent circuit. Simulation results for both filters are produced using Agilent ADS software. © 2015 IEEE.

World University root node

Proceedings of 2015 IEEE International Conference on Electrical, Computer and Communication Technologies, ICECCT 2015

Circuital approach to design FSS spatial filter

Compressive sensing is applied for Digital in-line Holographic Microscopy assuming the object wave is sparse in spatial domain. The reconstructed complex image is free of noise when compared to conventional method of numerical reconstruction. © OSA 2015.

Frontiers in Optics 2015

Compressive Sensing for Digital In-line Holographic Microscopy

Conventional angle sensors can measure only 360°,but passenger car steering wheel turns through +/-720° (a total of 4 complete turns). In this paper we describe iGMR based steering wheel angle sensor implementation which can be used as a rotation sensor to measure +/- 720°.

International Journal of Engineering and Technology

Design and development of labview based steering wheel angle sensor system

In this work, we examine the potential improvement in inductance (L) and quality factor (Q) of on-chip ferromagnetic thin film inductors through the formation of conical microstructures by localized ultraviolet laser irradiation on ferromagnetic thin film. Parameters affecting L and Q, and arising from the surface modification upon laser irradiation include thickness of the film, size, and density of the structures. The thickness of the film is optimized to 0.2 μm, and at least 18% increase in inductance and 25% increase in Q-factor for NiFe thin film in comparison to the conventional spiral inductor is expected. L and Q values of NiFe films with and without microstructuring are compared, and a 7% increase is predicted for the microstrucired film. The proposed fabrication process, including the laser microstructuring technique, is likely to provide a significant flexibility, cost effectiveness and even better parameters, if other material systems are considered. © 2015 Taylor and Francis.

Journal of Electromagnetic Waves and Applications

Improvement in inductance and Q-factor by laser microstructuring of ferromagnetic on-chip thin film inductors

Development of flexible sensors/electronics over substrates thicker than 100 μm is of immense importance for its practical feasibility. However, unlike over ultrathin films, large bending stress hinders its flexibility. Here we have employed a novel technique of fabricating sensors over a non-planar ridge topology under pre-stretched condition which not only helps in spontaneous generation of large and uniform parallel buckles upon release, but also acts as stress reduction zones thereby preventing Poisson's ratio induced lateral cracking. Further, we propose a complete lithography compatible process to realize flexible sensors over pre-stretched substrates thicker than 100 μm that are released through dissolution of a water soluble sacrificial layer of polyvinyl alcohol. These buckling assisted flexible sensors demonstrated superior performance along different flexible modalities. Based on the above concept, we also realized a micro thermal flow sensor, conformally wrapped around angiographic catheters to detect flow abnormalities for potential applications in interventional catheterization process.

Scientific Reports

Buckling assisted and lithographically micropatterned fully flexible sensors for conformal integration applications

The objective of this paper is to harvest maximum power from the solar panel using voltage based MPPT circuit for low power application under varying atmospheric conditions. A voltage based tracking system consisting of a voltage sensor, DC-DC boost converter, maximum power point tracker and a LED lighting load is designed and developed. The analog MPPT controller using direct feed forward PWM control signal for DC-DC converter operated in the continuous conduction mode is the principle block performing the tracking operation. Since the output of solar panel is nonlinear, the optimal power point will vary due to change in irradiance and temperature. Irrespective of the change in atmospheric conditions, the voltage sensor developed here has the ability to generate accurate reference voltage in accordance with the panel output and thereby maintains maximum power at the load. The experimental results have proved a power conversion efficiency of 97.48 % in clear sky condition, and (92.64 to 95.48) % in partial shading conditions resulting from the feed forward control technique employed in the MPPT circuit. The proposed tracking system is less complex and low cost one that has high tracking efficiency with less fluctuation in real time dynamic conditions compared to that of conventional tracking algorithms.

International Journal of Renewable Energy Research

An improved feed forward PWM control for MPPT of solar PV systems under varying atmospheric conditions

The chromosome abnormality in human is a vital issue. These abnormalities happen due to touching or overlapping chromosomes in human beings. It may cause breast cancer, improper structure or functions in body metabolism, birth defects, down syndrome, turner syndrome etc. To overcome these problems a stringent screening and diagnosing must be followed during earlier stage of pregnancy. In this paper Novel and Maximum-Likelihood segmentation algorithms were used to segment the overlapping and touching human chromosome images. Either the gray scale image was converted into color image or a color image is directly applied as the input to the Novel as well as Maximum-Likelihood segmentation algorithms. After obtaining threshold from binary, the watershed transform was applied. The output of watershed was improper. So after threshold the iterations were applied, followed by edge detection and corresponding segmentation. The Novel algorithm worked better only for touching chromosomes images but failed to work for overlapping images. Then the segmentation was followed using Maximum-Likelihood segmentation algorithm. By comparing with Novel algorithm, the Maximum-likelihood segmentation algorithm works better for both touching and overlapping chromosome images. © 2006-2015 Asian Research Publishing Network (ARPN).