Navigation Links
Detective work using terahertz radiation
Date:11/21/2012

It was a special moment for Michael Panzner of the Fraunhofer Institute for Material and Beam Technology IWS in Dresden, Germany and his partners: in the Dresden Hygiene Museum the scientists were examining a wall picture by Gerhard Richter that had been believed lost long ago. Shortly before leaving the German Democratic Republic the artist had left it behind as a journeyman's project. Then, in the 1960s, it was unceremoniously painted over. However, instead of being interested in the picture, Panzer was far more interested in the new detector which was being used for the first time here. Using it, the scientists gained important information about the layered structure of the wall and the structure of the picture area being examined. The joint project was sponsored by IWS, the Academy of Fine Arts Dresden [Hochschule fr bildende Knste Dresden (HFBK)], the Research Institute for Monument Conservation and Archeometry [Forschungsinstitut fr Denkmalpflege und Archometrie (FIDA)] and the Technical University Dresden through the German Federal Ministry of Education and Research BMBF.

According to Panzer, the special thing about the terahertz (THz) scanner is that In comparison with traditional processes, such as X-ray scanners, it works without causing any damage whatsoever. In addition, it does not require a special permit, as in the case of harmful X-rays. This is because the scanner only generates a radiated power of less than 1 W. For comparison: under less than ideal conditions, cell phones emit up to 2 Watts. Furthermore the process, provides concrete data on the structure of the individual layers or of potential hollow areas. In this way the device also indicated in the Hygiene Museum that in one area the plaster on the wall had evidently been repaired - a valuable clue for the restorer.

The scientists used short electromagnetic pulses that penetrate the various materials almost without attenuation, whereby some materials display characteristic absorption lines, which can be used to identify them clearly. In previous tests, however, the system had reached its limits, for example with behind-the-wall paintings on uneven, very structured walls. For this reason the scientists at IWS continued to develop the detector head by modifying the THz optics together with the Fraunhofer Institute for Physical Measurement Techniques IPM. The application spectrum of the scanner was also expanded.

Caution, contaminated art

Currently, many museums cannot present valuable exhibits to the public because they are contaminated with biocides. The reason for this is that in the 1970s, with the best of intentions, antique textiles or wood sculptures were sprayed with pesticides to keep them from being destroyed. Today it is known that these agents are hazardous to health and a number of different measurement and decontamination processes are being tested. IWS, together with further partners, now wants to set up a project with the aim examining the possibilities and limits of the THz technology for organic biocides. In contrast to the current X-ray fluorescence analysis which works on an element-selective basis, THz scanners recognize substances on the basis of the molecular bonding structure. Organic biocides, in particular, could be differentiated in such a manner," explains Michael Panzner.

To date, such expensive examinations are often only possible in well-equipped laboratories. In the future the tests are to be feasible on-site using a mobile scanner. However, a more research is still required until small, portable devices are available that are suitable for such purposes. Above all, close communication and cooperation with restorers and monument preservationists is required for the continued technological improvement of the THz measurement system. Panzner and his team are also hoping for a lively exchange at the European trade fair for monument preservation, restoration and refurbishment of old buildings, the denkmal, in Leipzig, Germany, where they will be exhibiting the new THz scanner generation in Hall 2, stand H30, from November 22 - 24, 2012.


'/>"/>
Contact: Michael Panzner
Michael.Panzner@iws.fraunhofer.de
49-351-833-913-253
Fraunhofer-Gesellschaft
Source:Eurekalert  

Related biology news :

1. International team discovers likely basis of birth defect causing premature skull closure in infants
2. Taking the pulse of volcanoes using satellite images
3. UCSB scientists report new beginning in split-brain research, using new analytical tools
4. Primates brains make visual maps using triangular grids
5. UC Davis researchers develop new drug delivery system for bladder cancer using nanoparticles
6. Using planarian flatworms to understand organ regeneration
7. The slippery slope to slime: Overgrown algae causing coral reef declines
8. App lets you monitor lung health using only a smartphone
9. Deep-sea crabs seek food using ultraviolet vision
10. New study shows promise in using RNA nanotechnology to treat cancers and viral infections
11. NIH-funded researchers restore sense of smell in mice using genetic technique
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Detective work using terahertz radiation
(Date:1/28/2016)... SAN JOSE, Calif., Jan. 28, 2016 Synaptics (NASDAQ: ... financial results for its second quarter ended December 31, 2015. ... the second quarter of fiscal 2016 increased 2 percent compared to ... the second quarter of fiscal 2016 was $35.0 million, or $0.93 ... Non-GAAP net income for the first quarter of fiscal 2016 ...
(Date:1/22/2016)... http://www.researchandmarkets.com/research/p74whf/global_biometrics ) ... "Global Biometrics Market in Retail Sector 2016-2020" ... --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced the ... in Retail Sector 2016-2020" report to ... and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced ...
(Date:1/18/2016)... JOSE, Calif. , Jan. 18, 2016 /PRNewswire/ ... security software that simplifies the use and access ... technology and go-to-market partnership with American Cyber.  ... Cyber brings extensive experience leading transformational C4ISR and ... implementing and integrating the latest proven technology solutions," ...
Breaking Biology News(10 mins):
(Date:2/11/2016)... ... 2016 , ... Global Stem Cells Group, has ... The new facility will provide advanced protocols and state-of-the-art techniques in cellular medicine, ... , The new GSCG clinic is headed by four prominent Ecuadorian physicians, including ...
(Date:2/10/2016)... NX Prenatal Inc., a US based ... for early warning of adverse pregnancy outcomes, announced ... by Dr. Thomas McElrath of Brigham ... Medicine,s (SMFM) annual meeting held in ... The presentation reported initial positive top-line results regarding ...
(Date:2/10/2016)... 10, 2016  Allergan plc (NYSE: AGN ) ... Brent Saunders , Allergan,s CEO and President, will be ... session at the RBC Capital Markets Healthcare Conference on ... The New York Palace Hotel in New ... live and can be accessed on Allergan,s Investor Relations ...
(Date:2/10/2016)... ... February 10, 2016 , ... LATHAM, NEW YORK... Marktech Optoelectronics ... Photonics West conference in San Francisco’s Moscone Center from February 16-18, 2016, and ... , These latest InGaAs PIN diode standard packages feature a TO-46 metal can ...
Breaking Biology Technology: