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发明公开
CN105806952A 一种采用超声脉冲反射水浸测量TC4激光快速成形与锻造TC4超声衰减差异方法 无效 - 撤回

一种采用超声脉冲反射水浸测量TC4激光快速成形与锻造TC4超声衰减差异方法
摘要：
本发明公开了一种采用超声脉冲反射水浸测量TC4激光快速成形与锻造TC4超声衰减差异方法，用来指导激光快速成形件超声检测工艺和标准制订，其特征在于：借助等尺寸相同尤其是厚度相同圆形试块，超声入射和反射面的表面粗糙度优于2μm，采用超声脉冲发射和接收仪器，500MHz数据采样卡，采集三次以上超声脉冲回波高度，利用公式α=[20lg(Bm/Bn)??]/[2(n?m)x]计算超声纵波衰减系数。本发明所述接收仪器采用奥林巴斯5077超声发射接收仪器，采用数字示波器采样并存储采样波形，采样频率不低于500MHz，垂直线性和水平线性满足GJB1580A要求。
摘要（英）：

The invention discloses a method for adopting ultrasonic pulse reflecting water immersion to measure TC4 laser rapid prototyping and forging TC4 ultrasonic attenuation difference.The method is used for guiding an ultrasonic detection technology and standard formulation of a laser rapid prototyping part and is characterized in that the surface roughness of an ultrasonic incident surface and a reflected surface is greater than 2 microns in virtue of equal-size same round test blocks, especially round test blocks equal in thickness, an ultrasonic pulse transmitting and receiving instrument and a 500 MHz data sampling card are adopted to more than three times of ultrasonic pulse echo heights, and a formula alpha = [20lg (Bm/Bn)-]/[2(n-m)x] is utilized to calculate ultrasonic longitudinal wave attenuation coefficients.The receiving instrument is an Olympus 5077 ultrasonic transmitting and receiving instrument, adopts a digital oscilloscope for sampling and sampling waveform storage, the sampling frequency is not lower than 500 MHz, and the vertical linearity and the horizontal linearity meets GJB1580A requirements.

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