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Studies on infectious diseases have helped us understand the extent to which public health systems would benefit from mapping the real-time distribution, condition and treatment efficacy of infectious diseases. Evidence suggests there is deficiency in timely and relevant geographic information that is undermining clinical, epidemiological and public health aspirations in areas affected with epidemic-prone...
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...
The present study describes construction of amperometric biosensor for determination of inorganic phosphate (IP) using single enzyme acid phosphatase (ACP). A blend of biopolymers agarose and guar gum was used to immobilize ACP and estimation of inorganic phosphate was carried out electrochemically using substrate L-ascorbic acid-2-phosphate. Enzyme catalyzes substrate hydrolysis and ascorbic acid...
Electrical Impedance Tomography (EIT) has its applications in several areas like medical imaging, process tomography, geophysical mapping of earth's crust and non destructive testing. Every application of EIT demands specific requirements from the instrumentation which is used to gather surface potential data from the object to be inspected. Key issues regarding design and choice of instrumentation...
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...
A methanol sensor based on polymer functionalized Quartz Tuning Fork (QTF) has been demonstrated. Thin polymer wires, formed of different polymers and with different additives, were used to form bridges between the two tines of the QTFs. The mechanical properties of the polymer wires, as well as the effective mass of the wires determine the resonant frequency of the QTF sensor. The interaction of...
The Al2O3 modified ZnO nanostructure with 1:9 ratio was synthesized at 500°C using solid-state reaction technique. The prepared nanostructure material was characterized with XRD and FE-SEM technique. XRD indicate the formation of wurtzite phase of ZnO. FE-SEM confirms the formation of hexagonal shaped rod like morphology. The sensing characteristic of the material was tested using ethanol gas.
The Dual-Probe Heat-Pulse technique has been widely used for in-situ moisture sensing. In the heater probe described in our earlier work the power consumption was 350 mW-the lowest in this category of sensors. In this paper, by employing a material selection method, we further improve the performance of the sensor by employing Parylene-coated nichrome wire and different packaging methods. The power...
Mn has substituted part of Fe in cobalt ferrite (CoFe2O4) and resultant material has been abbreviated as CFMO (CoFe1.7Mn0.3O4). Chemical co-precipitation route has been followed for synthesis. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), I-V measurement were performed for sample characterization. The influence of Mn substitution was seen...
Output from any MEMS Sensor usually lacks the power that can be fed directly to any interface circuit. Hence there is a need to add additional circuitry in between the output of the MEMS sensor and the interface circuit. In this paper the authors have compared two combinations of modulator / demodulator circuitry which can be used in the readout circuitry for any MEMS sensors. The two combinations...
MIL-101-Fe (Materials of Institute Lavoisier) nanoscale-metal organic frameworks (NMOFs) were synthesized by solvothermal method with constant heating at 200°C in silicon oil bath. The as prepared MIL-101-Fe nanoparticles are observed to have particle size in the range of 200–210 nm with multiple shape morphology. Further as prepared MIL-101-Fe are functionalized by incorporating amine group into...
LTCC is a known suitable platform for microfluidic systems. We have developed actuation-less non-return valve for gases and liquids, which is based upon the inlet and reverse pressure. This work compares three different designs of such valves. In these designs, top lid and bottom cavity layer together forms micro fluidic channel, through which fluid or gas can flow. The pressure based movable ceramic...
In previous research work related to the acoustic sensors, the researchers had focused on the individuality of the sensors for aeroacoustic application and sensors for audio range application. This paper describes a simple and novel model of acoustic sensor for aeroacoustic and audio applications (microphone). The model of the device presented in this paper shows interoperability. The sensor reported...
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...
ATP conferred protection of silver nanoparticles (AgNPs) against salt induced aggregation has been used as a simple, sensitive and cost effective tool for detection of acid phosphatase (ACP) activity. In the absence of the enzymes, unreacted ATP protects AgNPs from salt-induced aggregation. Dephosphorylation of ATP in the presence of the enzyme reduces the protecting action of ATP and thus there is...
Zn doped cobalt ferrites Co1−xZnxFe2O4 (x = 0.0, 0.1, 0.3) powders were synthesized by chemical co-precipitation method. Phase formation and crystalline nature was verified by using X-ray diffraction and Raman spectroscopy. The saturation magnetization (Ms), coercivity (Hc) and remanent magnetization (Mr) was recorded using vibrating sample magnetometer at room temperature. Magnetostriction measurements...
Titanium oxide films were prepared on ITO coated glass substrates at 350 C using titanium (IV) isopropoxide, acetylacetonate and absolute ethanol as precursors by spray pyrolysis technique. The prepared films were characterized by X-ray diffraction, Scanning electron microscope, Fourier transform infrared spectroscopy and Energy dispersive analysis of X-rays. Estimated optical and electrical parameters...
ZnO Nanostructured thin film of thickness 200nm was deposited on quartz by spray pyrolysis technique; further interdigitated ITO electrodes were fabricated by lithography. Compositional, surface morphology and electrical characterization of ZnO nanostructure thin film was done using X-ray photo electron spectroscopy (XPS), Secondary electron microscopy (SEM), and current-voltage (I-V) measurement...
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