Design of a dynamic measurement system for Bl factor spatial distribution of resonant blood viscoelastic sensor / 生物医学工程学杂志
Journal of Biomedical Engineering
;
(6): 965-972, 2023.
Article
in Chinese
| WPRIM
| ID: wpr-1008922
ABSTRACT
Bl factor is a key system parameter of the resonant blood viscoelastic sensor. In this paper, a dynamic measurement system for the spatial distribution of Bl factor based on velocity amplitude and motional impedance was designed. The system extracted the velocity amplitude and motional impedance of the coil under the dynamic condition of driving the sensor to generate simple harmonic oscillations using laser displacement and impedance analysis combined with in-phase/quadrature demodulation algorithm, and controlled the equilibrium position of the coil by adjusting the direct current component of the excitation current to realize the position scanning. In the position interval of [-240, 240] μm, the maximum coefficient of variation of the measurement results was 0.077 3%, and the maximum relative error to the simulation results was 2.937 9%, with a linear fitting correlation coefficient R 2 = 0.996 8. The system can be used to accurately measure the spatial distribution of Bl factor of the resonant blood viscoelastic sensor, which provides a technical support for the verification of the design of the sensor magnetic circuit.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Algorithms
/
Computer Simulation
/
Electric Impedance
/
Lasers
/
Motion
Language:
Chinese
Journal:
Journal of Biomedical Engineering
Year:
2023
Type:
Article
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