能否開(kāi)設(shè)一個(gè)相控陣專(zhuān)欄大家分享和交流一下新得？

只看該作者 · 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.
無(wú)損檢測(cè)中使用的常規(guī)超聲探頭就晶片數(shù)量而言有兩種：一種是只包含一個(gè)晶片，這個(gè)晶片既用于生成又用于接收高頻聲波；而相控陣探頭一般是一個(gè)換能器組件，這個(gè)組件包含16到256個(gè)數(shù)量不等的小型單個(gè)晶片，每個(gè)晶片可被分別觸發(fā)

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.
相控陣探頭與常規(guī)單晶探頭的不同點(diǎn)在于，它可以根據(jù)聲波返回到每個(gè)晶片的時(shí)間和波幅，在空間上對(duì)返回的波前進(jìn)行分揀，而常規(guī)單晶探頭實(shí)質(zhì)上只是發(fā)射到被檢測(cè)區(qū)域的所有聲束的結(jié)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.
儀器軟件對(duì)返回的聚焦法則進(jìn)行處理時(shí)，將每個(gè)返回的聚焦法則看作聲束以某個(gè)具體角度、從線(xiàn)性聲程上的某個(gè)點(diǎn)、和/或從某個(gè)具體的聚焦深度反射的聲束（參見(jiàn)圖1-5和圖1-6）。然后，儀器會(huì)將回波信息以多種顯示形式的一種呈現(xiàn)在屏幕上。

N-D-E · 2015-1-2 18:31:01

相控陣相對(duì)常規(guī)超聲的優(yōu)勢(shì)：
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.相控陣技術(shù)優(yōu)于常規(guī)超聲技術(shù)之處在于它可以使用單個(gè)探頭組合件中的多個(gè)晶片使聲束進(jìn)行偏轉(zhuǎn)、聚焦和掃查。利用通常被稱(chēng)為“S掃查”（扇形掃查）的聲束偏轉(zhuǎn)，可以適當(dāng)?shù)慕嵌壬杀粶y(cè)工件的圖像。這樣極大地簡(jiǎn)化了檢測(cè)幾何形狀較為復(fù)雜的工件的過(guò)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.使用單個(gè)探頭以多個(gè)角度檢測(cè)焊縫的能力極大地提高了探測(cè)焊縫異常狀態(tài)的幾率。電子聚焦可在會(huì)出現(xiàn)缺陷的位置處優(yōu)化聲束的形狀和大小，從而可進(jìn)一步提高檢出率。