&nbsp;颗粒两相流超声过程层析成像系统研究

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南京大学学报(自然科学版) ›› 2013, Vol. 49 ›› Issue (1) : 20-26.

颗粒两相流超声过程层析成像系统研究

田昌，苏明旭，陈孝震，蔡小舒

作者信息 +

An investigation on ultrasonic process tomography system
for particle two-phase flow measurement*

Tian Chang，Su Minh一Xu**，Chen Xiao- Zhen，Cai Xiao Shu

Author information +

文章历史 +

摘要

本文主要介绍了一种基于透射模式的超声波层析成像系统的设计与研究.针对Radon变换与
Radon反变换对获得精确重建图像所提出的无限多的投影数据要求，系统在以下几个方面做了改进:系
统换能器阵列由16个换能器组成，每个换能器均可以作为发射端和接收端，可发射的扇形波束角度为
15%;基于LabVIFW软件和2块高速同步数据采集卡，设计了16通道的数据同步采集和信号处理装
置;利用单片机89S52设计了切换电路，可以实现16换能器的激励和接收功能的自动切换.经实验验
证，系统结构简单，实时性好，获得了足够多有效的信号数据，通过二值化逻辑反投影图像重建算法实现
了研究物体横断而的图像重建.

Abstract

Ultrasonic process tomography has revealed many advantages and promising applications in industry process on-
line measurement and environmental monitoring. However, what still remains as a crucial problem in this technology is the
quick and synchronous acquisition of useful and sufficient experimental data,which play a key role in the mathematical inversion
and image reconstruction.This work presented a transmission-mode ultrasonic process tomography system consisting of a
sensor array with a higlrspecd data acquisition cardCDAQ)and signal processing devices with switching device. The sensor array
contains 16 ultrasonic transducers and each transducer can emit farrshaped beams with angle as lark as 150 de}recs. A personal
computer is used for recording experimental data and communicates with the other device as a host. By implementing a Lab
VIEW-based program it can synchronously acquire the real-time data of 16 channels of two DAQ cards at 12 bit resolution
where the multiple-channels switching device with microprogrammed control unit(MCU)is of utmost importance for real-time
measurements.Though the configuration of this system has feature of simple and easy operation,an experiment on Zcflon cyl
inder has demonstrated that it can work well in one transmitting and multi-receiving mode in which the attenuated ultrasonic
waves from the transmitting transducer can be received by other transducers simultaneously. More significantly, an accurate
cross-section image of the object under investigation can be reconstructed using the experimental data.

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田昌，苏明旭，陈孝震，蔡小舒
. 颗粒两相流超声过程层析成像系统研究[J]. 南京大学学报(自然科学版), 2013, 49(1): 20-26

Tian Chang，Su Minh一Xu**，Chen Xiao- Zhen，Cai Xiao Shu. An investigation on ultrasonic process tomography system
for particle two-phase flow measurement*[J]. Journal of Nanjing University(Natural Sciences), 2013, 49(1): 20-26

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基金

National Natural Science Foundation of China(51176128,50836003，51076106)，Project of Shanghai Sci-
ence and Technology Commission(10540501000) ,Key Project of Shanghai Municipal Education Commis-sion(12ZZ142)