基于激光扫掠原理的人工心瓣关闭速率实时诊断技术

以激光扫掠法为基础，结合计数型信号处理技术和微机高速数据采集方法，构成了人工心瓣瞬时关闭速率的激光实时诊断系统。介绍了激光扫掠法的基本原理之后，讨论了各主要光学部件的作用及准直透镜和圆柱光栅的位置参数对测量结果的影响，分析了实时信号处理系统的构成及工作原理，并给出了单叶碟型机械心瓣关闭速率的实测结果。

Real-time Diagnostic of Instantaneous Closing Velocity of Mechanical Heart Valve Prosthesis Based on the Principle of Laser Sweeping

By combining a digital counting processing method and the computer sampling technique, a real time signal processing system is realized to construct a laser sweeping technique (LST) with real time ability to measure the instantaneous closing velocity of mechanical heart valve prosthesis. After a brief review of LST, the effect of the positions of the collimating lens and the moving grid on the measurement results is analyzed. A practical grid construction is presented, and the principle and the construction of the signal processor are discussed in detail. The statistical behavior of MHV closure can be drawn out from real time realization of instantaneous closing velocity obtained by using the new laser diagnostic system. The system has been used for the diagnostic of leaflet closing velocity of a monoleaflet type MHV, and the experimental results are given.