By G. Engl, V. Schmitz, O. A. Barbian (auth.), Prof. Dr. P. Höller (eds.)
During fresh years an expanding volume of study has been carried out to boost tools and tactics for bettering inter pretation in nondestructive checking out. This study covers appro priate checking out methods in addition to the algorithms for interpre tation. in numerous instances a country has been reached which permits for implementation. the target of the workshop used to be to assemble researchers and business clients of either international locations and co-workers from different international locations for a radical and demanding dialogue of ways a long way we have now come and the place we need to visit clear up the fundamental functional difficulties of interpretation in nondestructive checking out and of information acquisition worthy for this function. Dr. Dau from EPRI acknowledged over the past foreign Confer ence for Nondestructive checking out in Nuclear that from the viewpoint of money and time spent study is the smallest a part of innovation yet, i need so as to add in complete contract with him, the main crucial. with out profitable learn innovation isn't attainable in any respect; yet neither examine and invention nor the other step in an innovation process may be passed over. Our philosophy is to maintain researchers concerned till the top of the innovation. that suggests until eventually a brand new or more suitable NOT-method is licensed below business surroundings and carried out in undefined. There may be doubtless that the additional we continue in this lengthy highway the extra must be concerned and think the initiative, accountability and the best role.
Read or Download New Procedures in Nondestructive Testing: Proceedings of the Germany-U.S. Workshop Fraunhofer-Institut, Saarbrücken, Germany Aug. 30 – Sept. 3, 1982 PDF
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Additional info for New Procedures in Nondestructive Testing: Proceedings of the Germany-U.S. Workshop Fraunhofer-Institut, Saarbrücken, Germany Aug. 30 – Sept. 3, 1982
The decoding of the digitized data is done in a gray code, the ADC is operating "steady open mode". That means, every change of input signal will cause immediately the output buffer to collect the right digital number. A sample rate of 200 MHz, gated in the propriate manner will provide the exact digital number corresponding to the input signal at the rate of 200 MHz. Of course there is no computer system available to handle this amount of data, especially if there are multiple channels. Therefore one needs a fast hardware digital data reduction, right behind the ADC.
Here are some characteristical values of a commercial available logarithmic ADC: - Dynamic range = 60 dB, that means single range of 5 mV - 5 V, according to UT-flaw signals. - Resolution = 0,5 dB or 7 bit, that means sufficient resolution for UTflaw- and dim-signals and eddy current. The ADC is around the O-base-line absolute symmetric, that means the positiv as well as the negativ half wave produce with 120 comparisons the digital value. An additional 8th bit produces a pre-sign. Non considering of this plus or minus pre-sign means processing of the absolute value and means rectification of the measurement value.
The upper right part of this figure contains transit time locus curves after noise elimination by ALOK-processing /1,3/. Curves with declining slopes are a result of UT with incidence of ultrasound from the left side onto the specimen and vice versa. The result of flaw reconstruction is shown in the lower part of Fig. 5. The borders of the tested bores are distinctively recognizable after complete reconstruction by ALOK. 4. CONCLUSION The newly developed apparatus ALOK-l has been tested several times in laboratorial as well as in industrial applications.
New Procedures in Nondestructive Testing: Proceedings of the Germany-U.S. Workshop Fraunhofer-Institut, Saarbrücken, Germany Aug. 30 – Sept. 3, 1982 by G. Engl, V. Schmitz, O. A. Barbian (auth.), Prof. Dr. P. Höller (eds.)