一開(kāi)始發(fā)送到大家留的郵箱中了,后來(lái)多了,就放到自己的郵箱,大家自己進(jìn)去提取吧,不再一一發(fā)送了。謝謝大家理解!{:soso_e183:}作者: kxw816 時(shí)間: 2012-5-31 15:52
感謝兄弟無(wú)私分享作者: flewn100 時(shí)間: 2012-5-31 23:06
謝謝了,下來(lái)看看作者: yemaojian7 時(shí)間: 2012-6-1 12:14
{:soso_e179:}分享力量很強(qiáng)大。。。作者: wciceman 時(shí)間: 2012-6-2 15:24
謝謝,已下載。學(xué)習(xí)。作者: 星火 時(shí)間: 2012-6-4 11:23
太給力啦,謝謝兄弟作者: 明明a 時(shí)間: 2012-6-4 14:23
[attach]3072[/attach]作者: 盼盼 時(shí)間: 2012-6-7 22:38
謝謝樓主,學(xué)習(xí)了作者: 糟老頭子 時(shí)間: 2012-6-7 23:24
IMPACT OF ELEMENTS SENSITIVITY AND PULSE EXCITATION ON PHASED ARRAY
IMAGING
Marc-Antoine BLANCHET and Kevin COTTON
SONATEST ADVANCED PRODUCTS
Québec, Canada [email protected][email protected]
Abstract
Ultrasonic inspection using phased-array technology is reaching a stage of maturity in many
countries. Although most concepts used in conventional NDT still apply, phased-array has its own
specificities that change the way we need to think about them. This paper presents the impact of the
element sensitivity variation on the echo-transmittance curve pattern. It can be demonstrated that
variations in elements sensitivity significantly impact the usual echo-transmittance patterns found in
conventional UT. Experimental results present typical curves for linear array and demonstrate how
both angular corrected gain and time corrected gain features can compensate for these variations.
The second part of this paper revisits the way an array transducer can be excited. With the
advances in transducer array manufacturing and material properties, NDT equipment manufacturers
now have access to high quality, large bandwidth transducers. Experimental results using negative
square pulsing, bi-polar pulsing and spike pulsing are presented, with their impact on pulse
duration, echo amplitude and overall signal quality.
Part 1 – Echo-Transmission - Introduction1
The basic physics principles of beam divergence, near field and far field sound pressure are still
fully valid when performing phased array ultrasonic inspection. It is important to have a deep
understanding of these concepts to avoid erroneous measurements. As phased array transducers are
composed of multiple elements, typically ranging from 16 up to 128 elements, the echotransmission
at the wedge/part interface is significantly affected by the elements sensitivity
uniformity. This first part of the paper presents the preliminary results obtained when measuring
echo-transmittance.
1 Please take note that at the time of publishing this paper, data analysis was still being completed.
Consequently, only preliminary results are presented. Exhaustive analysis will be presented at
conference time.作者: okwxb 時(shí)間: 2012-6-12 08:29
超聲波TOFD培訓(xùn)資料.ppt (3.26M, 2012年6月9日 9:44 到期)
在線預(yù)覽 | 下載 TOFD普及班培訓(xùn)教材.pdf (1.88M, 2012年6月9日 9:45 到期)
在線預(yù)覽 | 下載 TOFD技術(shù)與標(biāo)準(zhǔn)-胡斌.pdf (2.2M, 2012年6月9日 9:45 到期)
在線預(yù)覽 | 下載 作者: szy 時(shí)間: 2012-6-12 09:31
{:soso_e100:}作者: 明明a 時(shí)間: 2012-6-13 11:26
[attach]3158[/attach]作者: 為人民服務(wù) 時(shí)間: 2012-6-15 23:26
謝謝分享!需要一份學(xué)習(xí),謝謝! [email protected]作者: sleaf 時(shí)間: 2012-6-16 10:56