能否开设一个相控阵专栏大家分享和交流一下新得？

显示全部楼层 · 2015-1-1 10:02:40

N-D-E · 2015-1-1 13:43:10

Conventional ultrasonic transducer for NDT commonly consist of either a single active element that both generates and receives high frequency sound waves, or two paired elements, one for transmitting and one for receiving. Phased array probes, on the other hand, typically consist of a transducer assembly with 16 to as many as 256 small individual elements that can each be pulsed separately.
无损检测中使用的常规超声探头就晶片数量而言有两种：一种是只包含一个晶片，这个晶片既用于生成又用于接收高频声波；而相控阵探头一般是一个换能器组件，这个组件包含16到256个数量不等的小型单个晶片，每个晶片可被分别触发

N-D-E · 2015-1-2 17:42:47

Unlike a conventional single element transducer, which effectively merge the effects of all beam components that strike its area, a phased array probe can spatially sort the returning wavefront according to the arrival time and amplitude at each element.
相控阵探头与常规单晶探头的不同点在于，它可以根据声波返回到每个晶片的时间和波幅，在空间上对返回的波前进行分拣，而常规单晶探头实质上只是发射到被检测区域的所有声束的结果融合在一起。

N-D-E · 2015-1-2 17:44:09

When processed by instrument software,each returned focal law represents the refection from a particular angular component of the beam,a particular point along a linear path, and/or a reflection from a particular focal depth(see Figure 1-5 and Figure 1-6).The echo information can then be displayed in any of several format.
仪器软件对返回的聚焦法则进行处理时，将每个返回的聚焦法则看作声束以某个具体角度、从线性声程上的某个点、和/或从某个具体的聚焦深度反射的声束（参见图1-5和图1-6）。然后，仪器会将回波信息以多种显示形式的一种呈现在屏幕上。

N-D-E · 2015-1-2 18:31:01

相控阵相对常规超声的优势：
1.The benefit of phased array technology over conventional UT come from its ability to use multiple elements to steer,focus,and scan beams with a single probe assembly.Beam steering, commonly referred to S-scaning(sectorial scaning),can be used for mapping components at appropriate angle. This can greatly simply the inspection of components with complex geometry.
1.相控阵技术优于常规超声技术之处在于它可以使用单个探头组合件中的多个晶片使声束进行偏转、聚焦和扫查。利用通常被称为“S扫查”（扇形扫查）的声束偏转，可以适当的角度生成被测工件的图像。这样极大地简化了检测几何形状较为复杂的工件的过程。
2.The ability to test welds with multiple angles from a single probe greatly increase the probability of detection of anomalies. Electronic focusing optimizes the beam shape and size at the expected defect location.
2.使用单个探头以多个角度检测焊缝的能力极大地提高了探测焊缝异常状态的几率。电子聚焦可在会出现缺陷的位置处优化声束的形状和大小，从而可进一步提高检出率。