摘要
激光超声测量技术是一种重要和先进的非接触式超声测量技术。为了减少测量系统各构成部分间的电缆连接,将无线通信技术与激光测量技术的特点相结合,研究了一种激光超声无损测量系统,分析了该测量系统的原理及构成。系统用掺钕钇铝石榴石固体激光器在材料中激励超声波,压电换能器接收超声信号。该信号经系统级芯片MSP430F2274单片机放大、模数转换成数字信号,然后由单片机控制nRF905芯片进行信号的无线传输。接收部分的单片机采用RS-232-C接口标准实现与计算机的串行通信,把信号送入计算机显示记录存储和处理。结果表明该系统实现了激光超声的近程无线测量,简化了系统的结构,传输性能稳定,对周围电子仪器干扰小,显示了很好的应用前景。
The laser ultrasonic technology is one of the most important and state-of-the-art non-contact ultrasonic measurement technology. Combined wireless communication technology and laser measurement technology, a novel laser ultrasonic nondestructive measurement system is presented to reduce cables connection between units of the system. The principle and structure of the system are introduced. A Nd： YAG solid laser is used to excite ultrasound in the specimen and a piezoelectric transducer is used to detect ultrasonic signal. The signal is magnified and digitalized by a system-on-chip MSP430F2274 single chip microcomputer. Then it is transmitted wirelessly via nRF905 chip under the control of microcomputer. The signal is delivered to computer through serial communication interface between single-chip microcomputer AT89S52 on the received terminal and computer under RS-232-C serial communication interface protocol. The pulse signal is then shown, recorded, saved and processed through computer software. The designed system realizes short distance wireless measurement of laser ultrasonic. It has some advantages such as predigested system structure, reliable transmission. It shows great potential for future applications.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第1期203-207,共5页
Acta Optica Sinica
基金
江苏省基础研究计划(自然科学基金)(BK2007601)
江苏省"青蓝工程"
江苏省高校自然科学基础研究项目(06KJB510048)资助课题
关键词
测量
超声测量系统
无线通信
激光超声
measurement
ultrasonic measurement system
wireless communication
laser ultrasonic
