Key result
A newly developed capacitive sensor successfully measured negligible changes in vessel diameter (tens of femtofarads) in a physical vascular model, with high precision dependent on proper shielding.
Why the study?
To investigate a prospective capacitive sensing method for measuring the physical characteristics of pulsatile liquid flow in a physical vascular model.
A newly developed capacitive sensor can accurately measure minute changes in vessel diameter in a physical vascular model, showing potential for biomedical applications involving pulsatile blood flow.
Should not yet change practice; leaves open translation of capacitive vascular sensing from physical models.
This article investigates a prospective capacitive sensing method for the measurement of physical characteristics of a pulsatile liquid flow. It was tested on a physical vascular model. The volume pulse wave sensor holds a high sensitivity and thus great potential in the field of industrial applications and also in biomedical applications where we also encounter a pulsating flow of blood. Two types of capacity sensors were developed and tested on our blood vessel model, currently used for the simulation of pulse wave propagation with the possibility of changes in vessel properties and many setups are reached for testing different pulse wave propagations. The newly developed capacitive sensor detects the capacity change of pulsating liquid flow in the vascular model. Data from the capacitive sensor are compared with two reference sensors, one for direct pressure sensing and the second for noncontact optical sensing of changes in diameter. The signal processing is used for all three types of sensors and analysis in the time and frequency domain to determine the accuracy. The use of capacitive sensors is promising since it can measure a negligible change in the diameter of the vessel in the range of tens of femtofarads (fF). We can confirm that the high precision measurement is dependent on the environment, which can cause the capacity change, but with proper shielding it can be eliminated.
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Barvik et al. (2023) studied Pulsatile liquid flow in a physical vascular model. Capacitive sensing method vs. Direct pressure sensing and noncontact optical sensing was evaluated on Accuracy of capacity change detection in pulsating liquid flow. A newly developed capacitive sensor successfully measured negligible changes in vessel diameter (tens of femtofarads) in a physical vascular model, with high precision dependent on proper shielding.
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