便携式无线人体脂肪率测量仪的设计

生物电阻抗法(BIA)是一种安全非侵入式的、结果可靠有效的人体组成成分(脂肪含量)测量方法。以此为原理,设计了一款便携式无线人体脂肪率测量仪。硬件上,系统以高集成化、低功耗的阻抗测量芯片AD5933为核心,通过蓝牙实现与上位机的无线通信,大大降低了设备的复杂度。软件部分提出一种单频点小阻抗范围的增益系数校准方式,计算量小且容易实现。将新测量仪和欧姆龙体脂仪HBF-358进行对比实验,并作Bland-Altman一致性分析。结果表明,二者的相关系数为0.997。此外,该测量仪还具有易操作、小型化的特点。

Designing of Portable Wireless Measuring Instrument of Human Body Fat Percentage

Bioelectrical impedance analysis is a safe and noninvasive method that provides reliable and sufficiently accurate estimates of human body composition(fat percentage). Based on this method, a portable wireless measuring instrument of human body fat percentage is designed. Characterized by high integration and low power, AD5933 is an important module of the instrument, using Bluetooth to communicate with computer wirelessly and reducing the complexity of equipment much more. A more practical calibration method of gain factor is proposed, suitable for signal frequency and small range of impedance measurement, having less calculation and realizing easily. The comparing experiment between the new instrument and ORMON HBF-358 is processed with Bland-Altman consistency analysis. The result shows the correlation coefficient between the new instrument and ORMON HBF-358 is 0.997.This instrument possesses the advantage of easy operation and small in size.