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<table cellpadding="3" cellspacing="0" width="100%" class="forumline"> <thead> <caption><table border="0" cellspacing="0" cellpadding="0" width="100%" class="forumheader"> <tr> <td align="left" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_left.gif" width="25" height="27" alt="" /></td> <td align="center" class="forumheader-mid">Topic review</td> <td align="right" valign="bottom" width="25"><img src="http://picsrv.fora.pl/AcidTechTiger/images/hdr_right.gif" width="25" height="27" alt="" /></td> </tr></table></caption> </thead> <tbody> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>lompiacv</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/AcidTechTiger/images/post_old.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Fri 20:17, 14 Jan 2011<span class="gen"> </span> Post subject: moncler daunenjacke Small diameter tubes in power</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Small diameter tubes in power plant repair problems and testing solutions <br /> <br /> <br />Dedicated pipe inspection probe path, the more successful is the wide-angle (K> 2.5), short edge (less than 5iTIm), small chips (6x6, 8x8) probe. Beijing Electric Power Construction Research Institute Liangxiang developed XG ~ 1 double-crystal surface is better focused angle probe, which would address the r ultrasonic testing of the difficulties of small diameter tubes. Department of Energy has issued a \As you know, ultrasonic crack detection inspection ultra high sensitivity, easily missed (but missed vortex is easy to crack. In a small pipe welding, welding process if correct, are usually difficult to produce transverse cracks), which make up the ray inspection of the seized crack less than easy to trickle,<a href="http://www.monclerjackens.net" target="_blank">moncler daunenjacke</a>, but the ultrasonic welding of small pipes and small holes in the pinhole easily missed. . 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M helm. 1q. tIepHI bilge L1 India. y / ultrasonic flaw detection can improve the performance of the instrument and put /, the government in the ultrasonic testing, the piezoelectric film of no more than test the reliability of the focused transducer, causing a great deal of attention by the working principle of Fresnel zone plate simple transducer structure of the focusing transducer better performance. Observed for the ultrasonic testing and acoustic band focused transducer ∞ production methods are well known. In the first case, the Fresnel piezoelectric films with even and odd with the polarization in the opposite direction, so the pulling power is continuous in the piezoelectric. In the second case,<a href="http://www.uggsstivali.org" target="_blank">ugg stivali</a>, with even and odd Fresnel zone between the electrodes is insulated. Instrument with even or odd with bringing the sound radiation or sound reception. In order to improve efficiency, stimulate the opposite phase signal them or opposite phase of the amplifier receives the input. At this time, the transducer acoustic signals radiated or received, the band selector to ensure maximum efficiency. Specifically for this instrument must be applied, or the combination of polarization band piezoelectric transducer. Focus selector in grams divided by a large surface (usually about 300mm) of the piezoelectric element, it has a large capacitance walk around (up to 10kf), and the signal generator to match a certain difficulty. Thus, the general polarization of the piezoelectric patches as small capacitor ribbon Royal focusing transducer is significant. And the Fresnel ring electrode with the corresponding distribution of power in the trenches on both sides of slices, the electrical connection Fresnel zone is shown in Figure 1a. Cable or radio connection with the center and the edge in series. Because the Fresnel zone area. Sm a (rm-r Ⅲ-1). Where rm-m radius of each band with different sizes, △ Sm = n / 2, detecting the problem does not exist. Another request in the welding process to avoid forced on n, reducing cracks garden elements, if some of the welding, \Then when the sine wave excitation voltage is fed by the input transducer, in the Philippines Huang Seoul to bring the voltage drop of each vibration of the vibration apparatus are equal. Because the thickness of the order of connection slip direction on the polarization of the piezoelectric element with even and odd Fresnel zone, so the instantaneous amplitude of the differentiation of the form shown in Figure l6,<a href="http://www.uggsbootsbillig.com" target="_blank">ugg boots günstig</a>, so with the even and odd Phil is the opposite phase with the radiation . When the transducer in the receiving state work, but also a similar process. To test the proposed focusing properties of the transducer, creating a good working guillotine rejection frequency 1.146MHz, the focus in the water calculated the Fresnel entitled even with a 80mm strip of piezoelectric elements,<a href="http://www.monclerjackens.net" target="_blank">Moncler online</a>, and piezoelectric Making Fresnel film electrode strip slot. With the radiation mode (India received) in water were measured. Using light as lmm custodial gold balls (O.76 wavelengths) as the reflection. Selector measured axial and focal plane of the sound pressure distribution shown in Figure 2. Visible. Transducer has a good focusing performance, calculated according to the test and obtained the following la the focal region the size of the piezoelectric element Results May 6. On the screen when in sorrow startling capsule summary of distribution i. Zhuang Xinhua coral tiles 2. Transcript enough 8. 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