用于人体皮肤阻抗测量的激励源设计

Excitation Source Design for Impedance Measurement of Human Skin

皮肤阻抗测量中,系统对激励源的质量要求很高。设计了一种基于AD9851和STC89C52的交变电流模式激励源。该激励源输出电流的幅值和频率在一定范围内可调,动态范围大,能用于人体皮肤阻抗的测量。试验表明,此激励源输出信号幅度和频率稳定性好,且输出阻抗高。

During the skin impedance measurement, the high quality of excitation source is critical to the measurement system. This paper designs a current mode excitation source based on the AD9851 and STC89C52 ,whose current amplitude and frequency can be adjusted in a certain range.It can be used in skin impedance measurement. Experiments show that the signal source has stable output signal amplitude and frequency, and high output impedance.