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 Wysłany: Czw 22:20, 13 Sty 2011 Temat postu: ugg italia Ultrasonic detection of changes in the |
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Ultrasonic detection of changes in the velocity of the positioning error caused by
35P91 material), the same applies to human error. In this part of the error analysis ruled out human error, the error has been corrected as shown in Table 2. Table 2 Test Environment 2 (SA a 335P91 material) the error correction table can be seen that the speed of sound changes did cause a positioning error. Reflecting the depth positioning error is small, for the K1 probe, even 80ram deep reflectors, the depth error has only been 0.3Inm, in fact from the 20ram 80ram deep into the depth of the four reflectors errors are less than lrnm . Front reflectors larger than the error,[link widoczny dla zalogowanych], increase the speed of sound is only 1.89% for the two test environments,[link widoczny dla zalogowanych], from 20mm to 80ram deep front four reflectors error has reached the maximum 3.4ram. Can be seen, the instrument can not display the depth of the correction,[link widoczny dla zalogowanych], but the front instrument display but must be revised, otherwise it will affect the test results. The revised formula for the future through the depth of the error and forward error reduction in different degrees, which were revised front error fell to an acceptable range (1mm) or less. Shows correction formula has some practical significance. NDT Analysis 33 Volume 7, after the above analysis, we have,[link widoczny dla zalogowanych], in the ultrasonic testing,[link widoczny dla zalogowanych], due to the speed of sound when tuning instruments and testing the speed of sound when the position error caused by the different correction formula is as follows: obviously, / 1 I ( . Kl2 (20) 2r21 (V2) 1 () _ll6 (21) and the need to meet:-V2 ), the reflector is greater than the actual equipment displayed on the front edge, and when the speed of sound reduction (V <,), the reflector is less than the actual equipment displayed on the front edge. Assuming the speed of sound by 10 %, the probe edge is 10ram, are: Z = 1.21Z really was +2.1 (23) reflector real frontier is displayed on the instrument in the forefront of a 21% increase on the basis of an additional 2.1mm. visible the forefront of change in velocity caused the error is relatively large, more than the acceptable range, must be amended. by the depth error correction formula can be seen that the ratio of depth error and the probe by two K values of sound velocity joint decision. is not difficult to find the , velocity ratio and the value of the probe K satisfy (24), the instrument display is exactly the depth of the real depth of the reflector, without correction calculation. 1.: I / 2 (24), the type (20) deformation are: Lu = Lu',/-()( 25) for the type (25) function image, as shown in Figure 1. z = 1.125Z = 0.75Z = 0.375, first-class,. .9 ≤ ≤.,.. ≤ ≤ z.t Figure 1 shows the true depth and instrument depth of the image in the sound velocity ratio function K values decrease and the probe is small, the true depth and shows the ratio of the depth of close to 1, that the velocity of a change in the depth of error is very small; in the speed of sound increase of 10% and is 2.1, the velocity change caused by the relatively large depth error, the true depth and instrument depth ratio of 0.299 shows, this time the error has exceeded the acceptable range, must be amended . Chinese Society for Nondestructive Testing Electromagnetic (Eddy) NDT personnel qualification examination centers ET-Il officer qualification training classes in evidence by the Center to be number one in January 2009, 11, a l2 held in Xiamen City, Fujian Province, NDT ET-II staff qualification training and examination classes. please Applicants fill out the \Information Welcome to www / eddysun.com one or w-ww.ndt-info.net to find out about. Contact: Lin, Ren Feng Tel :0592 -2111528 Fax :0592 -2237091 E-mail: [link widoczny dla zalogowanych]
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