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首页> 外文期刊>Nondestructive Testing and Evaluation >A 2D STATIC ULTRASONIC ARRAY OF PASSIVE PROBES FOR IMPROVED PROBABILITY OF DETECTION
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A 2D STATIC ULTRASONIC ARRAY OF PASSIVE PROBES FOR IMPROVED PROBABILITY OF DETECTION

机译：被动问题的二维静态超声阵列，可提高检测概率

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An experiment was conducted to investigate the potential of using the passive (awaiting active pulsing) transducers in a 2D ultrasonic array as signal receivers. This paper will demonstrate that this new technique normal probe diffraction (NPD) which can increase the probability of detection (POD), without increasing the amount of false positives. Three 10 mm diameter, 5 MHz straight beam probes were used at linear distances of 22.5 and 45 mm, from the transmitter. AV1 calibration block was used as an aid to experimental repeatability, and the 2mm notch was utilized as a pseudo defect. The probes were used in a single transmission (Tx) with dual receiver (Rx) formation in alternate positions, to collect information from areas of the sound field that would be lost using a standard pulse echo technique. The readings were taken from the area prior to the first backwall echo because this eliminates confusion due to the sidewall reflections. The experiments will show that the diffracted echo signal can be detected using the passive probes using NPD techniques.
机译：进行了一项实验，以研究将二维超声阵列中的无源（等待有源脉冲）换能器用作信号接收器的潜力。本文将证明这种新技术是普通探针衍射（NPD），可以增加检测概率（POD），而不会增加假阳性的数量。使用三个直径为10 mm的5 MHz直光束探头，距发射器的线性距离分别为22.5和45 mm。 AV1校准块被用作辅助实验可重复性，而2mm的缺口被用作伪缺陷。这些探头用于单次传输（Tx）中，并在交替的位置形成双接收器（Rx），以收集来自使用标准脉冲回波技术会丢失的声场区域中的信息。读数是从第一个底面回波之前的区域获取的，因为这消除了由于侧壁反射而引起的混乱。实验将表明，使用NPD技术的无源探头可以检测到衍射回波信号。

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