Design of a dynamic measurement system for Bl factor spatial distribution of resonant blood viscoelastic sensor.
10.7507/1001-5515.202301019
- Author:
Jun QIAN
1
;
Haixuan SUN
2
;
Bidou WANG
2
Author Information
1. Division of Life Sciences and Medicine, School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Suzhou, Jiangsu 215163, P. R. China.
2. Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, P. R. China.
- Publication Type:Journal Article
- Keywords:
Bl factor;
Blood viscoelastic sensor;
Laser displacement;
Motional impedance;
Spectral leakage
- MeSH:
Computer Simulation;
Electric Impedance;
Motion;
Algorithms;
Lasers
- From:
Journal of Biomedical Engineering
2023;40(5):965-972
- CountryChina
- Language:Chinese
-
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.
