Nondestructive Inspection for Steel Billet Using Phase-Modulated Signal by Gold Sequence for Improving Measurement Speed
Nondestructive Inspection for Steel Billet Using Phase-Modulated Signal by Gold Sequence for Improving Measurement Speed
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DOI：
10.1143/jjap.51.07gb17
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发表时间：
2012-07-01
影响因子：
1.5
通讯作者：
Wakatsuki, Naoto
中科院分区：
文献类型：
--
作者：
Norose, Yoko;Mizutani, Koichi;Wakatsuki, Naoto
我们提出了一种使用纵波的飞行时间（TOF）的超声波计算机断层扫描方法作为钢坯的缺陷检测方法。然而，由于信号独立传输的要求，需要逐一进行传输，因此测量TOF需要很长时间。在本研究中，为了加快TOF测量速度，我们提出了一种利用Gold序列相位调制信号的TOF同步测量方法，并通过实验评估了同时测量的能力。坯料表面的反射波对TOF的测量有非常不利的影响，因此需要短信号作为发射信号。为了使传输信号变短，采用了由 Gold 序列进行相位调制的半正弦脉冲。因此，可以使用五个同时传输来检查钢坯。当同时进行五次传输时，总测量时间可以减少到前一次的1/5。 (C) 2012 日本应用物理学会
We have proposed an ultrasonic computerized tomography method using the time-of-flight (TOF) of a longitudinal wave as a defect detection method for a steel billet. However, it took a long time to measure the TOFs because the transmissions were made one by one from the requirement of independent signal transmission. In this study, to speed up the TOF measurement, we proposed a simultaneous measurement method of TOFs using the phase-modulated signals by Gold sequences, and evaluated the ability of simultaneous measurement by an experiment. The reflected wave from the billet surface had a very adverse effect on the measurement of TOF, so a short signal was required as the transmitted signal. To make the transmitted signal short, a half-sine pulse phase-modulated by a Gold sequence was employed. As a result, five simultaneous transmissions were possible to be used for the inspection of the billet. When five simultaneous transmissions are made, the total measurement time can be decreased to 1/5 of the previous one. (C) 2012 The Japan Society of Applied Physics