The unevenly distributed Lorentz–Gaussian beams are difficult to reproduce in practice, because they require modulation in both amplitude and phase terms. Here, a new linearly polarized Lorentz–Gauss beam modulated by a helical axicon (LGB-HA) is calculated, and the two various experimental generation methods of this beam, Fourier transform method (FTM) and complex-amplitude modulation (CAM) method, are depicted. Compared with the FTM, the CAM method can modulate the phase and amplitude simultaneously by only one reflection-type phase-only liquid crystal spatial light modulator. Both of the methods are coincident with the numerical results. Yet CAM is simpler, efficient, and has a higher degree of conformance through data comparison. In addition, considering some barriers exist in shaping and reappearing the complicated Lorentz–Gauss beam with heterogeneous distribution, the evolution regularities of the beams with different parameters (axial parameter, topological charge, and phase factor) were also implemented.

为了能够更加清楚地了解一种可以连续测量的非接触式血压检测方法，介绍了基于脉搏波传导时间的能够在不接触身体的情况下完成的血压测量方法。详细叙述了采用脉搏波进行血压测量的发展史和两种不同的测量脉搏波传导时间的方法，以及基于两种测量方法的特征点提取和建模分析、血压计算方法等，并比较两种方法的优缺点。最后对采用脉搏波测量更多的生理参数进行了展望。

提出了一种基于射频信号的非接触式血压检测方法，设计了血压检测系统并进行了数据的测试及分析。主要针对传统袖带式血压计对于特殊人群使用不方便以及现有血压检测主流方法中光信号易受干扰、测量不准确、需要跟身体接触等问题进行了方法探究。系统发射射频信号到身体上的待检测点，然后采集反射回来的信号，由多普勒效应原理可以得到脉搏波传导的波形图，并计算脉搏波传导时间，代入血压计算模型中，得到血压值，从而实现非接触式连续检测、监测。实验结果证明，该装置可以实现对血压的非接触式连续检测和监测，为便携式可穿戴式血压测量及实时监测设备提供了可参考的实施方法。

In this Letter, vortex phase and sinusoidal phase modulations of Hermite–Gaussian beams are studied theoretically and experimentally. The coding method of the experiment is introduced in detail, and the evolution law of focus under different beam order (m, n) and topological charge (l) is given. In order to verify the accuracy of the generation experiment, the optical field distribution under sinusoidal vortex modulation is analyzed deeply. The relevant analysis and methods provided in this Letter have certain practical significance for the development of laser mode analysis, optical communication, and other fields.