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Design and simulation analysis of a cylindrical shell capacitive pressure sensor for noninvasive measurement of low pressure

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Abstract

Capacitive pressure sensors (CPS) have several applications and are widely used for pressure measurement. However, they have a significant disadvantage in terms of sensitivity versus dynamic range trade-off. Mostly, it is crucial and challenging to use CPS for noninvasive assessment of low pressure in medical flexible tubings. Diaphragm displacement of flat plate sensors due to a radial displacement of a fluid catheter is small. This makes the sensor insensitive because the transmission mechanism might not amplify the input displacement for minute but significant loads. Additionally, the dynamic range and sensitivity are reduced because of the small contact surface area between the catheter and a flat plate diaphragm. To address these challenges, we design and analyze a novel type of sensor, namely, the cylindrical shell capacitive pressure sensor (CS-CPS). CS-CPS allows increased contact surface area between the sensor and flexible tubings, thus enhancing input displacement, sensitivity, and simplicity of integration with flexible tubings. The sensor is designed and simulated in COMSOL Multiphysics. The finite element analysis method is utilized to analyze the diaphragm deformation and capacitance variations in response to pressure. For verification purposes, we do a mathematical analysis in MATLAB using the derived deformation and capacitance variation formulae. Compared to the flat plate sensor, the newly designed sensor achieved an increased diaphragm displacement of 2.49×10 and sensitivity of 2.312×10 without compromising the dynamic range. The CS-CPS has shown to be more effective than the flat plate sensor for noninvasive sensing of pressure in flexible tubings.

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No datasets were generated or analyzed during the current study.

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Funding

This work was financially supported by Microport Vision Power MedTech Company under Grant 21XD1434500.

Author information

Author notes

  1. Zhaohua Chang, Jiahui Hu and Simon Nandwa Anjiri have contributed equally to this work.

Authors and Affiliations

  1. School of Health Sciences and Engineering, University of Shanghai for Science and Technology, No.516 Jungong Rd, Shanghai, 200093, Shanghai, China

    Leah Salome Anzetse & Zhaohua Chang

  2. Department of Research and Development, MicroPort VisionPower MedTech Co., Ltd, No.1601 Zhangdong Rd, Shanghai, 201318, Shanghai, China

    Zhaohua Chang & Jiahui Hu

  3. Department of Control Science and Engineering, University of Shanghai for Science and Technology, No.516 Jungong Rd, Shanghai, 200093, Shanghai, China

    Simon Nandwa Anjiri

Contributions

L.S.A. drafted and wrote the original main manuscript text and simulations, Z.C supervised the research, J.H and S.N.A. reviewed the manuscript, and S.N.A analyzed the results.

Corresponding author

Correspondence to Simon Nandwa Anjiri.

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Anzetse, L.S., Chang, Z., Hu, J. et al. Design and simulation analysis of a cylindrical shell capacitive pressure sensor for noninvasive measurement of low pressure. J Comput Electron 24, 134 (2025). https://doi.org/10.1007/s10825-025-02351-0

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  • DOI  https://doi.org/10.1007/s10825-025-02351-0

Keywords

  • Capacitive pressure sensor
  • Cylindrical shell
  • COMSOL Multiphysics
  • Structure optimization
  • Sensitivity

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