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[en] The angular dependence(profile) of backward radiated ultrasound was measured for glass specimens with random surface roughness using ultrasonic goniometer that ran changes the incident angle continuously. It was concluded that the roughened region had greater acoustic impedance than the unperturbed region. The comparison of backward radiations showed that the amplitude of peak and the area of radiation profile were increased with surface roughness. It was suggested from the sensitive dependence of the profile area that the profile of backward radiation could be applied to in the nondestructive evaluation of sulfate region. Inclined C-scan technique with the transducer inclined at Rayleigh angle showed the reverse of luminosity and the high signal to noise ratio so that it provided high resolution
[en] The above meeting was held in Colombo, Srilanka, on 15-19 August 2005, under the RCA (Regional Cooperative Agreement for Asia and Pacific Region) Project on Advanced Industrial Radiography (RAS/8/100). The objectives of the Meeting were to a)review the national certification systems for NDT, b) introduce basic requirements of ISO17024 and ISO9712, c) review and revise the national requirements for certifying bodies of participating Member States and d) identify ways for mutual recognition of NDT standards and practices of Member States with a view to achieving harmonization at the regional level. 21 participants from 14 RCA Member States and the IAEA Expert Mr. Peter Hayward of New Zealand attended the Meeting. Mr. Prinath Dias, RCA Coordinator represented the IAEA.
[en] It will be shown how models can simulate all the elements of an ultrasonic NDE measurement system, including the pulser/receiver, cabling, transducer(s), and the acoustic/elastic waves fields. When combined, these models form what is called the electroacoustic measurement model. It will be demonstrated how this electroacoustic measurement model can be used to conduct parametric transducer and system studies and how the model can form the basis for experimentally characterizing all the elements of the ultrasonic measurement system, using purely electrical measurements
[en] Some techniques developed recently for sizing small fatigue cracks are described. One is an ultrasonic technique which deals with a small closed crack, where both the stress closing the crack and the crack size are determined by analyzing inverse problem. Here, difficulties encountered in NDE of closed cracks by usual ultrasonic techniques are summarized in advance. Secondly, the closely coupled probes potential drop (CCPPD) technique, which is based on d-c potential drop measurement, is explained fur sizing small cracks. The CCPPD technique is not affected by crack closure. Finally, a discussion is given on NDE of materials degradation in conjunction with sensitive NDE of small cracks
[en] The aspherical glass lens is required high dimensional precision such as the lack of defect. In this paper, we examined the detectable defect by using the resonant ultrasound spectroscopy (RUS). The RUS is the measurement system which is to excite the specimen and to inspect the differences of resonant frequency pattern between acceptable specimen and specimen which has some defects. In this paper, for nondestructive evaluation by using RUS, we measured the resonant frequency of a aspherical glass lens. With the results, we could evaluate the characteristic of aspherical glass lens about some flaws.
[en] The nondestructive testing using ultrasonic pulse-echo data is an effective test methodology especially for metal structure. Typically, the ultrasonic pulse-echo data is processed and the results are shown in A-scan, B-scan or C-scan formats. Upon viewing B-scan and C-scan data the viewer is able to identify the location of faults as well as their rough dimension. In this paper, we evaluate the applicability of various 3-D visualization methods frequently used in medical imaging, namely, surface rendering (SR), volume rendering (VR) and maximum intensity projection (MIP), for nondestructive testing purpose. Such 3-D visualization of ultrasonic pulse-echo data enables easier identification of the location and dimension of faults more accurately.
[en] This paper propose electronic speckle pattern interferometry(ESPI) for reliability evaluation of electronic device. Especially, vibration problem in a fan of air conditioner, motor of washing machine and etc. is important factor to design the devices. But, it is difficult to apply previous method, accelerometer to the devices with complex geometry. ESPI, non-contact measurement technique applies a commercial fan of air conditioner to vibration analysis. Vibration mode shapes, natural frequency and the range of the frequency are decided and compared with that of FEM analysis. In mechanical deign of new product, ESPI adds weak point of previous method to supply effective design information
[en] A global inspection equipment is developed to evaluate the status of component operations and function error, as well as having a comprehensive function board after examining the infrared components. Its basic principle is to analyze the measured power of the infrared rays each part emits at each instant. After applying the power and setting the initial conditioning signals to the board under test, tile system determines the normality of the parts and determines whether the board is working well. The normality is determined by comparing the change of infrared energy with tile reference patterns of the known good boards. The results of experimental test with several boards show that the system is accurate and reliable test solution and one of very useful methods to test PBA nondestructively.
[en] We observed topography under water using a tuning fork system which can be controlled a tip-sample distance to apply the near-field scanning microwave microscope (NSMM) for a bio-sample. We obtained topographical images of a water drop and a metallic sample under water in order to inquire an efficiency of tuning fork system.
[en] The 15th ISO/TC 135 plenary, sub-committee, and working group meetings were held in Columbus, Ohio USA from the 15th to the 21st October, 2005 in conjunction with ASNT fall conference and Quality Testing Show. In this period, the meetings of the subcommittee 2, 4, 6, 7, 8, SC7/WG 7 and SC7/WG 8 meetings were held. Seven persons from Korea participated in the meetings. Here summarized are the results of the meetings and the status of the ISO/TC 135.