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Wireless Sensor Networks (WSN) is an emerging technology with a potential to revolutionize the way we sense and transmit the information. The applications are many and look to be limited by our imagination and ingenuity. Some of the important applications are process monitoring, military surveillance, structural health monitoring, environment monitoring, health monitoring, Nuclear, Biological and...
Thispaper presents the design and realization of a context-aware wireless health monitoring system for recording the heartbeat (HR) and respiration (RR) rate based on an indirect measurement approach. The system consists of a contact-less medical sensor as well as a communication infrastructure for handling the transmission and reception of the measured results. The contact-less sensor includes a...
Molten salt level measurement in the process vessels of pyrochemical reprocessing of spent metallic fuels is one of the key process parameters. Level measurement of hygroscopic and high temperature salts is a challenging task. It is proposed to use an ultrasonic based level measurement. The Commercially available ultra sonic level indicators have the limitations such as their physical dimensions,...
Tungsten oxide is amongst the most widely used materials in electro-, photo-chromic applications. Recently tungsten oxide has been employed as sensing layer for detection of hazardous gases. In this work, we report synthesis of WO3 nanoparticles via a facile hydrothermal method using sodium tungstate and different organic acids (viz. citric acid, oxalic acid, malonic acid, and (L+) tartaric acid)...
In the present work, we report the room temperature NH3 sensing properties of Cobalt-boride nanoparticles intercalated polyaniline (Co-B-PANI) nanocomposite films. Polyaniline nanocomposite films (PNCF's) have been deposited at room temperatures by in-situ oxidative polymerization of aniline in the presence of Co-B nanoparticles. The PNCF exhibited a highly selective, sensitive and reversible response...
DC SQUID sensors based on Nb-AlOx-Nb Josephson junctions were designed and developed at IGCAR, Kalpakkam. Necessary electronics to linearize the SQUID output was developed in-house. These SQUID sensors were used to develop various measuring systems like SQUID magnetometer, SQUID based NonDestructive Evaluation system and multichannel SQUID based biomagnetic measuring systems. In addition supportive...
Compositions of nominal formula, SrFe1−xTixO3-δ (x = 0 − 0.8) were prepared by solid state method and characterized by X-ray diffraction and Mossbauer spectroscopic studies. Electrical conductivities of these samples were studied at different temperatures in three different oxygen concentrations. Thin films of SrFe0.2Ti0.8O3-δ and SrFe0.35Ti0.65O3-δ were deposited on polycrystalline alumina using...
The paper presents Tin oxide (SnO2) based low cost, high temperature operable resistive type low humidity (10–20%RH) sensor. SnO2 thin films were prepared by spin coating 50 μl of synthesized (SnCl2) solution on alumina substrate (1.44 cm2). Material characterization of the synthesized material was carried out using UV-Visible, SEM and XRD. To get films of higher thickness they were coated from 1...
Fully digital time-domain temperature sensors are designed and placed at five different positions within FPGA. Five tiny pulse-generators are used as five temperature sensors. Using manual floor-planning four sensors are placed at four different corners and one at centre. Single 9-bit Time to Digital Converter is utilized for digital output coding. Vernier Time to Digital Converter with 6 picoseconds...
Cadmium zinc oxide (CdXZn1−XO) thin films were deposited at low substrate temperature using advanced spray pyrolysis technique. Aqueous solution of cadmium acetate and zinc acetate were used as initial ingredients. The films were prepared by keeping optimized preparative parameters constant. Influence of variation of zinc in the ‘CdXZn1−XO’ system on the structural, electrical and gas sensing properties...
The present work is about preparation and characterization of high temperature oxygen sensing composite material consisting of Gadolinium doped Ceria (GDC) together with a relatively low temperature melting, ionic conducting glass to facilitate lower sintering and operating temperature. This paper reports the physical and ionic conductivity properties of this sintered composite as a function of operating...
Compositions of nominal formula, SrFe1−xTixO3-δ (x = 0 − 0.8) were prepared by solid state method and characterized by X-ray diffraction and Mossbauer spectroscopic studies. Electrical conductivities of these samples were studied at different temperatures in three different oxygen concentrations. Thin films of SrFe0.2Ti0.8O3-δ and SrFe0.35Ti0.65O3-δ were deposited on polycrystalline alumina using...
There is a growing interest in developing efficient and economically viable hydrogen (H2) sensors for the swift detection of leakage of H2 in areas where hydrogen is used. In the present study we have prepared palladium catalysed antimony doped tin dioxide by sonochemical process, as a H2 gas sensing material for 1000 ppm to 8% by volume H2 gas concentration. The electrical characteristics of the...
In the present work, a commercial device for the detection of H2S using SnO2; CuO thin film as a sensing material has been demonstrated. A complete device consist of SnO2: CuO sensor thin film deposited on alumina substrate, teflon head in stainless steel housing containing the temperature control circuit with Pt-50 based heater and Pt-100 as reader, and a stand-alone monitor consisting of Data Acquisition...
The ferroelectric and piezoelectric properties of Sn4+ modified (Ba0.7Ca0.3)(Ti1−xSnx)O3, (with x = 0.000 to 0.100 in steps of 0.025) lead free electroceramics were investigated. With Sn4+ substitution, a structural phase transition from pure tetragonal to pseudo-cubic structure has been observed; which strongly influence the ferroelectric/ piezoelectric nature of the samples. At room temperature,...
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