Department of Electrical and Electronics Engineering

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Subject: search.filters.subject.Pressure sensor

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Now showing 1 - 8 of 8
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    Investigation on substrate material for a sensitive flexible piezoresistive pressure sensor
    (IEEE, 2025-02) Gupta, Navneet
    This study investigates the substrate in flexible piezoresistive pressure sensor (FPPS) for improving the performance of sensors. Initially, we employed the technique for order preference by similarity to ideal solution (TOPSIS) and VlseKriterijumska Optimizacija I Kompromisno Resenjein in Serbian (VIKOR) to evaluate all potential substrates materials for FPPS. Key material attributes that play an important role are the glass transition temperature, thermal conductivity, Young’s modulus, water absorption, and coefficient of thermal expansion (CTE). To identify the most promising substrate material, we utilized the TOPSIS and VIKOR ranking systems followed by simulation analysis using COMSOL Multiphysics 6.0. Our analysis shows that polyethylene naphthalate (PEN) is the optimal substrate material for FPPS. The results demonstrate good agreement across all material selection methodologies and simulations, validating the robustness of our findings.
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    Implementation of Wired and IoT Based Wireless Transmitters for a Pressure Sensor
    (IEEE, 2023-02) Yenuganti, Sujan
    In this paper, a wired and wireless transmitter for two different designs of hall effect-based pressure sensors are designed and experimentally tested. A wired transmitter is designed by converting the actual sensor output to a 1-5V range using a signal conditioning circuit, followed by a voltage-to-current (V-I) converter to convert the signal conditioning circuit output to a 4-20 mA current signal which can be transmitted to any remote indicator without any data loss. A wireless transmitter is also designed with the same signal conditioning circuit and a Wi-Fi module to transmit the pressure sensor data wirelessly to the IoT cloud server. The Blynk IoT console is used as a server to access the transmitted data through a PC/laptop connected to the Internet. The linearity as % deviation and % error of the V-I converter is calculated for wired transmission and the mismatch between transmitted and received data is also found for the wireless transmission for both sensor designs. The proposed transmitters are of low cost, and simple in design, and the pressure sensor data can be transmitted in real-time using both wired and wireless modes.
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    Design and Simulation of a Differential Resonant Pressure Sensor
    (IEEE, 2023) Yenuganti, Sujan
    Pressure is one of the critical physical attributes that need to be continuously monitored, accurately measured, and recorded in most of manufacturing industries. This paper proposed a novel depiction of a differential resonant-based pressure sensor with a circular diaphragm and boss structure for gauging pressure in the range of 0–10 bar. The applied pressure is converted into a differential frequency signal at the two beams having one edge rigidly fixed and the other one, connected to a central structure which is coupled to the boss structure of the diaphragm. Both the analytical and numerical modeling were performed on the sensor design. Optimum sensor dimensions were scaled during numerical simulation in such a way that the diaphragm bestows maximum deflection when pressure is applied to it. The differential arrangement of the beams also helps in maintaining their stability for any ambient temperature divergence. Analytical model results performed using MATLAB were also found to be in accordance with the numerical simulation done on COMSOL Multiphysics. Stainless steel was used as the material for the simulations and was also intended to be the material for the fabrication of the sensor. Using stainless steel as the fabricating material and the sensor’s self-packaging design gives it the ability to perform well even at high temperatures and also provides protection from general corrosive environments
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    Freestanding HEMT Inspired GaN based Optical Pressure Sensor With Grating Coupler
    (IEEE, 2024-10) Singhal, Rahul
    One key challenge encountered by photonic integrated circuit is to couple light to and from optical fibers efficiently. The standard fiber used for telecommunication or data communication is single-mode fiber (SMF), which has a mode field diameter (MFD) of less than equal to 10µm at 1550 nm. Efficient coupling from SMF to waveguide with size of hundreds of nanometers is a challenge due to the large mode field mismatch. This problem is usually addressed using two solutions, in-plane or butt edge coupling and out plane (vertical) grating coupling. To ensure good coupling efficiency along with practical feasibility, the grating on freestanding HEMT inspired GaN optical waveguide is a suitable choice for desired wavelength profile with high sensitivity. In this paper, the vertical gratings are introduced on freestanding HEMT inspired GaN optical waveguide for high pressure sensor applications.
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    Fabrication and testing of a Hall effect based pressure sensor
    (Emerald, 2022-04) Yenuganti, Sujan
    This paper aims to present the fabrication and testing of a pressure sensor integrated with Hall effect sensors and permanent magnets arranged in two configurations to measure pressure in the range of 0–1 bar. The sensor is fabricated using stainless steel (SS) and can be used in high-temperature and highly corrosive environments. The fabricated sensor is of low cost, self-packaged and the differential arrangement helps in compensating for any ambient temperature variations.
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    Design and Simulation of Digital Output MEMS Pressure Sensor
    (Springer, 2020-05) Yenuganti, Sujan
    This paper presents the design and simulation of a MEMS pressure sensor with a digital output for measuring pressure in the range of 0–1 bar. The sensor uses the diaphragm deflection and a simple mechanical structure to convert the applied pressure to a logic digital output. Three different designs of the sensor have been proposed with square and circular diaphragms. The first design uses ten different sized square diaphragms on the same substrate to get a resolution of 0.1 bar. The second design uses a single square diaphragm instead of ten to get the same resolution. The third design also uses a single circular diaphragm with a central boss structure, which reduces the deflection nonlinearity at low pressures. Analytical analysis was carried out for all the diaphragm deflections, and the results are supported by numerical simulations carried out in COMSOL Multiphysics tool. The proposed sensor can operate on 5 V which suits well with conventional CMOS logic. The direct digital output from the pressure sensor makes its useful in wide variety of applications.
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    Langasite crystal based pressure sensor with temperature compensation
    (Elsevier, 2018-10) Yenuganti, Sujan
    This paper presents the design and testing of a new pressure sensor utilizing a doubly rotated cut piezoelectric langasite (LGS) crystal resonator with temperature compensation. The sensor can measure temperature and pressure simultaneously by using the dual mode nature of the doubly rotated cut langasite resonator (SBTC). The sensor is designed using CAD software, fabricated and tested experimentally in the laboratory for a pressure range from 0 to 45 PSI. Before fabrication the sensing principle was verified performing a force frequency analysis on the langasite resonator using a special apparatus. The experimental results on the sensor show a good linear relationship between applied pressure and C-mode frequency. Temperature compensation is also achieved by utilizing the dual mode behavior of the LGS crystal resonator. The comparison between our experiment and Peer’s theoretical modelling results shows a reasonable consistency. The sensor structure is very compact, robust, low cost and temperature compensation can be achieved at high temperatures particularly in nuclear applications.
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    A Flexible Pressure Sensor Based on Multiwalled Carbon Nanotubes/ Polydimethylosiloxane Composite for Wearable Electronic-Skin Application
    (IEEE, 2022) Gupta, Navneet
    The multiwalled carbon nanotubes/ polydimethylosiloxane (MWCNT/PDMS) composite based pressure sensor has been widely adopted in wearable health care devices and electronic-skins due to its high flexibility, piezoresistivity, high sensitivity over a broad linear range and biocompatibility. Herein, MWCNT/PDMS composites with different MWCNT contents were fabricated and their mechanical and electrical characteristics were evaluated in detail for each case. The MWCNT/PDMS composite pressure sensors shows high sensitivity (0.02715–0.08283 kPa -1 ) over large pressure sensing range from 0.1 to 100 kPa. In addition, through the cyclic stretching test, the strain-sensing properties of the MWCNT composite shows high reliability over 1000 repetitive cycles. The flexible devices can be used as the wearable electronic skin and successfully mounted on human skin to achieve the capability of physiological stimuli monitoring, i.e., human wrist pulse wave for health care applications. The wide linear working range with high sensitivity of the MWCNT/PDMS pressure sensor makes it a potential choice in flexible electronics such as wearable devices for health care monitoring, soft robotics and E-skin application.