基于音圈电机振荡源的阻抗测量系统辨识精度评估的研究

Research on identification accuracy evaluation of impedance measurement system based on voice coil motor oscillator

基于强迫振荡技术(forced oscillation technology,FOT)的肺功能检查对早期发现气道疾病具有重要意义,但如何提高及评估阻抗测量系统的辨识精度仍是当前难点。针对此问题,本研究以音圈电机为振荡源构建阻抗测量系统,通过对3D打印的气道模型进行阻抗测量,分析了阻抗与支气管堵塞程度的敏感性和分布关系。结果表明,基于音圈电机的阻抗测量系统能够检测到气道模型两个以上小孔径(0.8 cm)截面积堵塞的阻抗变化,并且阻抗与堵塞端口数量近似呈指数分布关系。本研究采用气道模型来量化评估了阻抗测量系统的辨识精度,推进了FOT技术在气道阻塞程度和阻塞部位评估的研究。

Pulmonary function testing based on forced oscillation technology(FOT)has great significance in the early detection of airway diseases,but how to improve and evaluate the identification accuracy of the impedance measurement system is still difficult.In view of the above problems,we builded an impedance measurement system with a voice coil motor oscillation source.By measuring the impedance of the 3D printed airway model,the sensitivity and distribution relationship between the measured impedance and the degree of bronchial obstruction were analyzed.The results showed that the impedance measurement system based on the voice coil motor could detect the impedance change of the cross-sectional area of more than two small apertures(0.8 cm)in the airway model,the impedance and the number of blocked ports were approximately exponentially distributed.Using the airway model to quantitatively evaluate the identification accuracy of the impedance measurement system,can advance the research of FOT in estimating the degree of airway obstruction and the location of the obstruction.