基于四電極多頻率掃描的生物阻抗法人體成分測試儀設計

摘" 要： 生物阻抗包含豐富的人體病理和生理電信號，可以作為醫務人員準確判斷病人癥狀和治療疾病的主要依據。基于此，提出一種基于Cole?Cole理論的人體多種參數測量系統。構建人體阻抗模型，通過碳納米材料電極對人體阻抗進行采集分析，得到人體的各種成分參數。通過信號發生電路產生注入人體的低頻信號，利用幅度檢測電路檢測流經人體電流產生的電壓，采用分段檢測法測得人體不同分段的阻抗信息；信號經放大電路輸入RT1052微處理器，對數據和人體成分參數相關性進行分析，得到人體各種成分參數并顯示測量結果。通過對系統進行測試分析，得出所設計系統能夠準確地對人體蛋白質、脂肪等參數進行測量，誤差范圍可以控制在5%以內，具有很好的應用前景。

關鍵詞： 生物阻抗法； 人體電抗； 分段檢測法； 信號采集； 多頻率掃描； RT1052微處理器

中圖分類號： TN919?34； R318.6" " " " " " " " " "文獻標識碼： A" " " " " " " " " " "文章編號： 1004?373X（2024）12?0045?07

Design of bio?impedance body composition tester based on four?electrode

multi?frequency scanning

HAN Tuanjun， HUANG Chaojun， LU Chao， WANG Guibao， LIU Wu

（School of Physics amp; Telecommunication Engineering， Shaanxi University of Technology， Hanzhong 723000， China）

Abstract： Bioimpedance contains abundant human pathology and physiological electrical signals， which can be used as the main basis for medical personnel to accurately judge patients and treat diseases. On this basis， a multi?parameter measurement system for human body based on Cole?Cole theory is proposed. In the system， a human body impedance model is constructed to collect and analyze various body parameters of the human body by means of carbon nanomaterial electrodes. The low?frequency signal injected into the human body is generated by means of the signal generation circuit， the amplitude detection circuit is used to detect the voltage generated by the current flowing through the human body， and the segmented detection method is used to measure the impedance information of different segments of the human body. The signal is input into the RT1052 microprocessor by means of the amplification circuit to analyze the correlation between the data and human body composition parameters， so as to obtain various human body composition parameters， and display the measurement results. After testing and analysis of the system， it is found that the designed system can accurately measure parameters such as human protein and fat， with an error range controlled within 5%， and has good application prospects.

Keywords： bioimpedance method; human body reactance; segmented detection method; signal acquisition; multi frequency scanning; RT1052 microprocessor

0" 引" 言

人體內各種成分的比例維持是身體健康的重要指標。在疾病發生時，人體組織各種成分的比例會早于臨床癥狀產生變化，如果能較早檢測到人體各種成分參數的變化，對于疾病的預防和治療具有非常關鍵的作用。而如何準確檢測身體各種成分參數和對人體健康進行有效評估已經成為醫學研究的熱點。本文利用生物阻抗原理進行人體各種成分的測量，研究發現，人體不同組織電阻率在不同條件下具有線性差異，可以利用這種電阻率變化測量人體成分[1?4]。……