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Author: search.filters.author.Yenuganti, SujanSubject: search.filters.subject.Resonant sensor

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    Piezoelectric based Resonance Displacement sensor
    (IEEE, 2013) Yenuganti, Sujan
    The paper presents design and development of a resonance displacement sensor. The sensor is built with cantilever as a resonator with piezoelectric excitation and sensing in closed loop electronics. The sensor measures the unknown displacement with good linearity within the measurement range. The input displacement varies the length of the resonator by a fixed roller arrangement. The shift in resonance frequency for a change in displacement is detected by closed loop electronics.
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    Thickness sensor for ferromagnetic sheets
    (IEEE, 2012) Yenuganti, Sujan
    The paper presents a novel design and development of a resonant sensor to measure thickness of ferromagnetic sheets and their alloys. The sensor is built with cantilever beam as a resonator with electromagnetic excitation and piezoelectric sensing in closed loop electronics. The sensor measures the unknown thickness by measuring the resonance frequency of the resonator. The magnetic force due to the magnetic field interaction between electromagnet and ferromagnetic sheet will make the resonator at resonance. The resonator vibrates at different resonance frequencies depending on the thickness of the ferromagnetic sheet. The shift in resonance frequency for a change in thickness is detected by closed loop electronics. The proposed system is simple and varies linearly with thickness in the given measurement range and the sensitivity is improved by increasing the magnetic field strength of the electromagnet.
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    Design and testing of piezoelectric resonant pressure sensor
    (Elsevier, 2016-10) Yenuganti, Sujan
    A stainless steel resonant pressure sensor with a new design is proposed with piezoelectric excitation and detection. The sensor consists of a sensing diaphragm, inclined trusses, vertical mounts and a resonating beam. The deflection of the diaphragm is transferred to the resonating beam via specially designed inclined trusses and vertical mounts. The analytical model of the sensor is developed using Ritz method and direct stiffness method for the non uniform sensing diaphragm and resonating beam respectively. The relation between strain due to applied pressure and change in the resonance frequency is derived. The sensor is also modelled numerically using MEMS CAD Tool CoventorWare. The sensor is fabricated with three different grades of stainless steel namely SS 304, SS 431, 15-5 PH, using Electrical Discharge Machining (EDM) and wire cut EDM process. The sensors are tested for its characteristics for an input pressure of 0–25 bar. The sensor fabricated using 15-5 PH is found to have good linearity, repeatability, higher sensitivity and low hysteresis compared to the sensors fabricated with SS 304 and SS 431. The sensor design is simple, fabrication involves well known machining process, self packed and hence cost effective.