γ-CT Technique Used for Industrial Multiphase Flow Detection

A gamma-ray Computed Tomography （CT）technique based on MATLAB has been developed,and its potential for the application of multiphase flow detection has been demonstrated with simulation results.Aiming to improve the real time performance,we design a CT system with fixed sources and limited detecors.By dissecting the imaging region with Delaunay triangulation method,the algebraic reconstruction algorithm and simultaneous multiplicative algebraic reconstruction algorithm re implemented respective algebraic reconstruction algorithm are implemented respectively to reconstruct cross-sectional images.The resultant images can be utilized to identify flow regimes or extract characteristic parameters.

一种基于FPGA的时间间隔测量系统设计

在地质勘探工作中,震波反射波对时间间隔测量技术的要求较高。为适应山川田野等复杂地质环境的地质测量,开发具有一定便携性和测量精度的便携设备非常必要,FPGA的高集成度使得这一测量系统的实现成为可能。设计了一种基于FPGA的时间间隔测量系统:采用多相计数法,在Verilog语言开发环境下,利用FPGA内部集成的PLL锁相环获得精准的多相采样时钟;充分利用FPGA并行运算特点,保障系统运算能力和测量精度。系统实测验证表明:该系统结构简单、功耗小、成本低、易携带,抗干扰效果好,系统测量精度可达到±1ns,测量时间间隔的动态范围可覆盖1ns~1.2h。