Design and development of GMR based low range pressure sensor for medical ventilator application.

Behera, B and Borole, UP and Sivaji, A and Khan, Jakeer and Kumar, P and Ananda, CM and Barshilia, HC and Chowdhury, P and Jadhav, JJ (2021) Design and development of GMR based low range pressure sensor for medical ventilator application. Sensors and Actuators, A: Physical,, 321. ISSN 09244247

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In this report, we present a thermally compensated low range magnetic pressure sensor. The fabricated sensor consists of a corrugated stainless steel (SS) diaphragm, a permanent magnet, a giant magnetoresistance (GMR) sensor, and a signal conditioning unit. The diaphragm with a permanent magnet produces a magnetic field which changes under the exposure of external pressure. The GMR sensor is placed asymmetrically with reference to the cylindrical axis of a magnet, which results in an output voltage proportional to external pressure. Simulations were performed to optimize the design having a linear output with higher sensitivity of the order of 14.97 μV/V/mbar, which is close to the experimentally measured value of 13 μV/V/mbar at room temperature. The sensor prototypes were fabricated in pressure ranges: ± 30 and ± 70 mbar. The fabricated pressure sensor prototypes were tested in different temperature ranges and calibrated for offset, linearity, and thermal variations using a commercial sensor signal conditioner. The performance of the calibrated sensors was evaluated at different temperatures and over an extended period. Furthermore, the performance of the sensor was experimentally evaluated in an indigenously developed medical ventilator, and compared with an existing commercial MEMS pressure sensor for a longer duration. The performance of the prototype sensor was found to be equivalent with an accuracy of ±0.1 mbar for an operation in the range of ± 30 mbar.

Item Type: Article
Uncontrolled Keywords: Magnetic pressure sensor, Ventilator, Magnetoresistive sensor, Signal conditioner, Low pressure
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
LIFE SCIENCES > Man/System Technology and Life Support
PHYSICS > Solid-State Physics
Depositing User: Mrs. Usha Kumari
Date Deposited: 04 Nov 2022 13:34
Last Modified: 04 Nov 2022 13:34

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