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Holographic data — Non-destructive testing
Conl:erencereport's Holographic Data - Non-destructive testing Dubrovnik, Yugoslavia, 4-8 October 1982 The 'Holographic Data - NonDestructive Testing' conference was attended by about 100 participants from 20 different countries. During the four days, 13 invited lectures and 32 papers were presented. The Conference was opened by E.N. Leith with a talk entitled 'Some major problem areas in holography' and closed by N. Abramson who presented an interesting paper on 'An optical view of politics'. Between these papers the following eight sessions were held: panoramic holography, transparent media diagnostics, materials science, biomedicine, fringe evaluation, pulse holography, optical processing, and industrial testing systems. As the conference was oriented towards the analysis of the results obtained by holography, and similar techniques such as interferometry and moir6 interferometry, the programme covered a wide field of applications. These ranged from the measurement of tension on the material surface at high temperatures in the region of 1000 K using the Heterodine Speckle Photogrammetry method (K. Stetson) to the use of holographic interferomerry to monitor deformities in an Italian Renaissance masterpiece - the relief 'The Life of Joseph' by Lorentzo
Reprints
Ghllberti - to determine the state of conservation and the best method of restoration (D. Bertani). The conference proper was, in fact, concluded with this exceptional paper. Among other subjects covered were microwave holography, 360 ° multiplex holography, diagnosis and nondestructive testing of transparent media (multi-pass) and application of parallelism interferometry for determining changes in fracture index and changes in the geometry of transparent objects. It was natural that detection of separation in composite materials should be covered, and among the papers noted was one which described a complete system for holographic examination of aircraft or automobile tyres (Jing-Tang Ke). No papers were presented in parallel. It was the intention of the International Scientific Committee to present to participants the various non-destructive testing methods based on holographic techniques without specifying the field of application, which could range from an aircraft wing to the timpanic membrane. There were not many papers describing applications in medicine, but the few that were presented demonstrated that the
method is rapidly approaching the state of clinical usage, especially in Otology (G. yon Bally). An already accepted application in orthopaedics and skeleton biomechanics was described in the paper by B. Kummer, who is possibly todays best-known biomechanical scientist. Probably the greatest interest was shown in the papers presented in Session 5, 'Fringe Evaluation'. It was evident that significant advances had been made towards solving the problem of optimal data reduction and the eventual automatic analysis of holographic interferograms. This research field is definitely of vital interest for the application of holographic methods in non-destructive testing, as it is well known that getting relevant data from an interferogram is much more difficult than forming an interferogram containing that data. The papers presented at the conference indicated the main directions of research in the HNDT field and it is interesting to note that many of the authors are now approaching the final realization. The main characteristics of all the attempts were the digitalization of interferograms, mainly by using a video camera as input, and the filtering of space noise (Spectle et al). This problem was until now best solved by man-machine interaction, but it was noted that attempts were being made to completely automate the process. The conference proceedings will be published in the first quarter of 1983 and will be available from SPIE. B. Bo~i~ek
Reprints of all articles in this journal are available in quantities of 100 or more.
Reprints are essential - Ofor the company that wants to distribute impartial comment on its activities to potential customers and clients.
Ofor the company that wants to up-date its technical staff on new techniques and new technologies.
For full details of prices and availability of reprints, please write to: The Reprint Department
Butterworth Scientific Limited -- Journals
PO Box 63 Westbury House
NDT INTERNATIONAL. APRIL 1983
Bury Street Guildford
Division
Surrey GU2 5BH
England
103
Reprints
Ghllberti - to determine the state of conservation and the best method of restoration (D. Bertani). The conference proper was, in fact, concluded with this exceptional paper. Among other subjects covered were microwave holography, 360 ° multiplex holography, diagnosis and nondestructive testing of transparent media (multi-pass) and application of parallelism interferometry for determining changes in fracture index and changes in the geometry of transparent objects. It was natural that detection of separation in composite materials should be covered, and among the papers noted was one which described a complete system for holographic examination of aircraft or automobile tyres (Jing-Tang Ke). No papers were presented in parallel. It was the intention of the International Scientific Committee to present to participants the various non-destructive testing methods based on holographic techniques without specifying the field of application, which could range from an aircraft wing to the timpanic membrane. There were not many papers describing applications in medicine, but the few that were presented demonstrated that the
method is rapidly approaching the state of clinical usage, especially in Otology (G. yon Bally). An already accepted application in orthopaedics and skeleton biomechanics was described in the paper by B. Kummer, who is possibly todays best-known biomechanical scientist. Probably the greatest interest was shown in the papers presented in Session 5, 'Fringe Evaluation'. It was evident that significant advances had been made towards solving the problem of optimal data reduction and the eventual automatic analysis of holographic interferograms. This research field is definitely of vital interest for the application of holographic methods in non-destructive testing, as it is well known that getting relevant data from an interferogram is much more difficult than forming an interferogram containing that data. The papers presented at the conference indicated the main directions of research in the HNDT field and it is interesting to note that many of the authors are now approaching the final realization. The main characteristics of all the attempts were the digitalization of interferograms, mainly by using a video camera as input, and the filtering of space noise (Spectle et al). This problem was until now best solved by man-machine interaction, but it was noted that attempts were being made to completely automate the process. The conference proceedings will be published in the first quarter of 1983 and will be available from SPIE. B. Bo~i~ek
Reprints of all articles in this journal are available in quantities of 100 or more.
Reprints are essential - Ofor the company that wants to distribute impartial comment on its activities to potential customers and clients.
Ofor the company that wants to up-date its technical staff on new techniques and new technologies.
For full details of prices and availability of reprints, please write to: The Reprint Department
Butterworth Scientific Limited -- Journals
PO Box 63 Westbury House
NDT INTERNATIONAL. APRIL 1983
Bury Street Guildford
Division
Surrey GU2 5BH
England
103