The results of measuring the derivative of the pulse wave using a laser autodyne based on the Fourier analysis of the low-frequency spectrum of the interference signal are presented. The features of using the windowed Fourier transform for window types and window widths are discussed. The correlation coefficient between the derivative obtained by direct differentiation of the sphygmographic signal and the frequency dependence of the windowed Fourier transform obtained from the analysis of the interference signal is calculated. It is shown that the amplitude of biovibration of the skin surface has the greatest influence on the correlation of the frequencies of the window spectrum of the autodyne signal with direct measurements of the pulse wave parameters by the sphygmographic method. Using a hardware-software system, we measured the sphygmogram of the pulse wave in the radial artery in a 19-year-old man who did not suffer from cardiovascular diseases. The derivative of the pulse wave obtained from the sphygmogram was compared with the dependence of the frequencies of the window spectrum of the autodyne signal. A comparative analysis of the dependences of the frequencies of the spectral harmonics of the window method with the derivative of the sphygmographic pulse showed a good correlation at the amplitudes of biovibration of the skin surface exceeding 10 μm.

给出了基于干涉信号低频频谱傅里叶分析的激光自差测量脉冲波导数的结果。讨论了对窗口类型和窗口宽度使用窗口傅里叶变换的特点。计算通过对脉搏信号进行直接微分得到的导数与从干扰信号分析得到的加窗傅里叶变换的频率依赖性之间的相关系数。结果表明，皮肤表面的生物振动幅度对自力信号的窗谱频率与脉搏波参数直接测量的相关性影响最大。使用硬件-软件系统，我们测量了一名未患心血管疾病的 19 岁男性的桡动脉脉搏波的血压图。将从脉搏图中获得的脉搏波的导数与自差信号的窗口频谱的频率依赖性进行比较。窗法光谱谐波频率与脉搏波导数的相关性比较分析表明，在皮肤表面的生物振动幅度超过10μm时具有良好的相关性。