Multi-frequency Synchronized Measurement Method of Bioimpedance Spectroscopy Based on Nuttall Self-convolution Windowed FFT Algorithm

Since the traditional frequency-sweeping based Bio-Impedance Spectroscopy (BIS) measurement method can not reflect accurately the true impedance of organism, the development of multi-frequency simultaneous fast measurement method of BIS has significance. A BIS Multi-Frequency Synchronized (MFS) measurement method is proposed based on MFS signal excitation and a windowed FFT algorithm. First, the synthesis of a seven-frequency synchronized signal, as well as its spectral characteristic, is introduced. Then, a Nuttall self-convolution window function with excellent performance is put forward, and the improved interpolation FFT-based harmonic analysis algorithm based on this window is built. It validates theoretically the feasibility of the proposed BIS Multi- Frequency Synchronized fast measurement method, and provides technical support for development of practical BIS fast measurement systems.