Department of Electrical and Electronics Engineering

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    Experimental studies on dynamic response of piezoelectric based hemispherical resonator gyroscope
    (Emerald, 2024-08) Rao, Venkatesh K. P.; Yenuganti, Sujan
    This work measures the performance characteristics of a hemispherical resonator gyroscope (HRG) and compares it with a numerical model. This work we explore the optical and piezoelectric measurement methods to determine the resonant frequency of HRG. These experimental results are compared with their numerically obtained values. To explore the performance characteristics, the effect of varying actuation voltages on the sense mode displacement and the piezoelectric sensor output was studied in the absence of input angular rate. The structure was then subjected to range of angular rate signals, at a constant actuation voltage and the corresponding sensor response was analysed.
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    Gate voltage tunable temperature coefficient of resistance of WSe2 for thermal sensing applications
    (IEEE, 2022-05) Rao, V. Ramgopal
    Two-dimensional (2D) materials have layered structure with unique properties. One of the properties of interest is the temperature coefficient of resistance (TCR) which should be large for fast thermal sensors. The TCR is the calculation of the relative change in resistance per degree of temperature change. Taking a step further, tunable TCR is a concept that involves the control of TCR by the gate voltage. Here we have shown that in a field effect transistor device, the 2D semiconductor material WSe2 has a TCR, which can be controlled by varying the applied gate voltage. We also compared it with MoS2 and found that the WSe2 TCR is approximately six times that of MoS2 and 19 times that of metallic thin films. Also, WSe2 TCR could be controlled to 300% of its value within 10V of applied gate voltage. Specific high values of TCR can be tuned using the gate voltage as WSe2 TCR can be selected to -8.7 %K-1. This has applications in bolometers, thermal sensors, and accelerometers.
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    Principles Of Materials Science And Engineering
    (Dhanpat Rai & Company, 2014) Gupta, Navneet