Design of a portable multi-physiological parameter detector(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2024年第4期
- Page:
- 486-494
- Research Field:
- 医学信号处理与医学仪器
- Publishing date:
Info
- Title:
- Design of a portable multi-physiological parameter detector
- Author(s):
- ZHOU Yanshun1; YU Zhiyuan1; GUO Yongsheng2; GUO Shengwen3
- 1. School of Material Science and Engineering, South China University of Technology, Guangzhou 510006, China 2. Guangzhou Zhongkang Xianjue Health Technology Co., Ltd., Guangzhou 510006, China 3. School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, China
- Keywords:
- Keywords: head-mounted detector biological impedance phase 4-electrode measurement scheme multi-physiological parameter detection
- PACS:
- R318；TH79
- DOI:
- DOI:10.3969/j.issn.1005-202X.2024.04.014
- Abstract:
- Abstract: A novel portable head-mounted detector is designed to obtain the multi-physiological parameters, such as electrical impedance, blood oxygen, heart rate and body temperature. To address the issues such as narrow excitation frequency range, low accuracy and long detection time in the existing impedance detectors, the developed detector adopts 4-electrode measurement scheme, using a direct digital frequency synthesizer and Howland current source to generate sinusoidal excitation currents through the human body, employing AD8302 gain phase detector chip from Analog Devices Inc., along with accompanying algorithms to calculate the amplitude and phase angle of the bodys impedance, which significantly enhances detection accuracy and efficiency. To further minimize system errors, an analog switch circuit is designed in conjunction with high-precision sampling resistors and phase-shift capacitors for system parameter self-calibration. Experimental results reveal that within the detection frequency range of 10 kHz to 1 MHz, the average detection errors for impedance magnitude and phase are less than 0.5% and 0.59°, respectively, with maximum detection errors less than 1.54% and 1.38°, respectively, demonstrating superior performance than impedance detection schemes based on the TI companys AFE4300 chip. Additionally, the device integrates modules for the detection of blood oxygen, heart rate, and temperature. Human body experiments also verified its superiority in accuracy and effectiveness of multi-physiological parameter detection.
Last Update: 2024-04-25