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Nanoporous non-siliceous materials such as carbons, nitrides, and phosphides have attracted much attention in the recent years due to their enormous applications in the fields of adsorption, catalysis, and fuel cells. However, the incorporation of hetero atoms such as boron and nitrogen in the non-siliceous materials can significantly change their electronic and semi-conducting properties. Firstly...
Surface plasmon behavior of the silver nanoparticles embedded in PVA matrix has been analyzed. The progressive shift in SPR caused by the addition of increasing amount of glucose from 30 to 50 mg/dl has been investigated to monitor the sensing operation of this nanocomposite and tried to correlate with the refractive index behavior by calculating refractive index sensitivity (S). To understand the...
The paper describes design and fabrication of simple, magnetically actuated flexible polymer valve for flow manipulation in the microfluidic network. The valve is made up of a polymer composite. The CoFe2O4 was embedded in PDMS (Polydimethylsiloxane) for making this polymer composite. The composites of different volume percentage loading of CoFe2O4 were used and for each concentration valves of different...
1st International Symposium on Physics and Technology of Sensors (ISPTS-1) was held between 8th to 10 March 2012. This was organized after the successful organizations of 16 events of “National Seminar on Physics and Technology of Sensors” (NSPTS) for last 16 years (between 1994 to 2011) in order to propagate the activity internationally. The program consisted of 21 plenary talks by eminent scientists...
Nickel manganite based negative temperature coefficient (NTC) thermistor compositions are extensively used as thermal sensors in a wide range of products and devices. Ni0.701Mn1.823Cr0.35Fe0.07Si0.056O4 NTC thermistor composition was prepared through solid state route. The tape casting slurry composition was optimized to get defect free ceramic tapes. Chip thermistors were prepared from these NTC...
An ammonia sensor based on Ag6Mo10O33 thick film was fabricated and tested. The morphology of the film was characterized by SEM. The electrical capacitance and impedance of the compound were investigated by exposing the film in air, air containing 500 vppm of H2, petroleum gas (PG) and NH3 independently at 350°C using AC impedance spectroscopy. When the film was exposed to air containing ammonia significant...
This paper reports the synthesis of nano crystalline nickel ferrite (NiFe2O4) by solvothermal technique using simple microwave oven. This ferrite nano powder was used as a functional material in the thick film sensors. Thick film sensors were fabricated using screen printing technique. The structural, microstructural, thermal analysis of powder and the film were characterized by XRD, SEM and TG analysis...
Nominal compositions of general formula In2−xMnxO3−δ were prepared by solid-state route and their electrical conductivity and hydrogen sensing characteristics were investigated. With manganese addition, the conductivity was found to increase initially and then decrease while the activation energy for the conduction process was increasing. In1.99Mn0.01O3-δ, In1.985Mn0.015O3-δ, In1.98Mn0.02O3-δ were...
In2O3 thin film was fabricated using pulsed laser deposition technique. The structure and morphology of the thin film were characterized by X-ray diffraction and atomic force microscopy respectively. AC impedance of In2O3 thin film gas sensor were investigated at different temperatures (275 – 425 °C) when exposed into clean air and air containing NOx. Significant NOx sensing characteristics of thin...
Electroceramics is a class of very important and versatile ceramic materials whose electrical properties are exploited to make devices for a number of advanced applications for civil and military use. These materials include: ferrites, ferroelectrics, piezoelectrics, pyroelectrics, microwave dielectrics etc. Their physical and chemical properties are sensitive to a change in the environment such as...
Use of FCM for inspection of fruits is proposed in this paper. In this method, an image of fruits is firstly taken in RGB color model. The output of imaging sensors is preprocessed in order to get proper image for evaluation purpose. An algorithm based on fuzzy c-means theory was developed for quality inspection of fruits. Discrete Wavelet Transform (DWT) is applied in order to extract the features...
Infrared (IR) detection in wavelength ranging from 3µm to 18µm has been a subject of extensive research due to its key role in commercial, defense and space applications. Infrared detectors require cryogenic cooling for their operation. First generation IR imaging systems used discrete element detectors operating in whiskbroom scanning mode from geostationary platform. Due to very less interconnections...
Oil debris monitoring is one of the important elements of an engine condition monitoring system. It is the activity that detects impending failures of bearings, gears, splines and other oil wetted components. There are three traditional methods or devices that are in common use in aircraft gas turbine engines: spectrometric oil analysis (SOA), magnetic chip collectors (also called magnetic plugs or...
In a solar photovoltaic (SPV) array [mxn] the solar modules are connected in series and parallel to achieve desired power output. The SPV array performance depends on different parameters such as incident insolation, temperature, array layout, shading etc. Shading due to cloud cover results in Non-Uniform Illumination (NUI STATES- BRIGHT, GREY and DARK). Mismatch in currents and voltages of the modules...
Miniaturization is an essential requirement for development of space-borne electronics hardware. Recently, advancements in the device and packaging technology such as Analog Front End (AFE), FPGA and ASIC has enabled on-board designers to develop space worthy, high reliability miniaturized hardware meeting the functional and performance requirements. HMC, SIP, 3D packaging technology etc. can further...
Vision ranks highest in hierarchy of human senses. Our perception of the world and things around us are perceived through our eye-sight with limitations such as resolution, speed, wave-length, etc. Sensors are devices used to sense signals of various forms of energy such as electro-magnetic (em) radiation, chemical, thermal, mechanical and magnetic in nature. Sensors used for detection of em radiation...
Present paper analyzes three arrangements of fiber optic bundle displacement sensor for improving the linear operating range of sensor. Concentric, random and hemi circular configurations of fiber bundles are examined. These different arrangements are studied for the variation in sensitivity and linear operating range with increase in number of fibers in a bundle. It is simulated in MATLAB and verified...
Thin film of cobalt phthalocyanine (CoPc), iron phthalocyanine (FePc) and CoPc-FePc composite were grown on sapphire substrate by molecular beam epitaxy under identical experimental conditions. Composite films showed very high mobility ∼ 110 cm2V−1s−1 at room temperature, which is nearly two orders of magnitude higher as compared to the pure CoPc and FePc films. We demonstrate that due to high mobility...
Grafting is important, feasible and dominant over other means for getting good yields from the plants because it does not implicate soma clonal variation in the yields. The detection of graft compatibility at early stage is, therefore, important in agriculture and forestry production. The other reported methods for detection of graft compatibility in plants are time-consuming, require skilled labour...
A pure and ZnO added CdO thin films are prepared by chemical bath deposition to study their ethanol sensing properties. The depositions were carried out in a highly alkaline condition where in cadmium acetate was used as a source of cadmium while zinc acetate was added as the source of Zn inclusion. These films were subsequently annealed at 723K and studied for its morphological, optical and gas sensing...
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