The abbey’s church of Chaalis, in the North of Paris, was founded by Louis VI as a Cistercian monastery on 10th January 1137. In 2013, in the frame the European Commission's 7th Framework Program project CHARISMA [grant agreement no. 228330] the chapel was used as a practical case-study for application of the work done in a task devoted to best practices in historical buildings and monuments. In the chapel, three areas were identified as relevant. The first area was used to make an exercise on diagnosis of the different deterioration patterns. The second area was used to analyze a restored area. The third one was selected to test some hypotheses on the possibility of using the portable instruments to answer some questions related to the deterioration problems. To inspect this area, different tools were used:
-Visible fluorescence under UV,
- THz system,
- Stimulated Infra-Red Thermography, SIRT
- Digital Holographic Speckle Pattern Interferometry, DHSPI
- Condition report by conservator-restorer.
The complementarity and synergy offered by the profitable use of the different integrated tools is clearly shown in this practical exercise.
Environmental impact on artworks has always been a big issues for preservation of Cultural Heritage. Nowadays with the climate change it is experienced a slow but steady process of temperature increase affecting relative humidity which fluctuates while materials attempt to keep moisture balance. During repetitive equilibrium courses fatigue accumulates endangering the structural integrity prior to fracture.
Assessing the risk imposed by the fluctuation allow preventive actions to take place and avoid interventive restoration action after fracture. A methodology is presented employing full-field interferometry by surface probing illumination based on direct realtime recording of surface images from delicate hygroscopic surfaces as they deform to dimensionally respond to relative humidity (RH) changes. The developed methodology aims to develop an early stage risk indicator tool to allow preventive measures directly through surface readings.
The presented study1 aiming to experimentally highlight acclimatisation structural phenomena and to verify assumed standards in RH safety range based on the newly introduced concept of deformation threshold value is described and demonstrated with indicative results.
Climate Change is one of the most critical global challenges of our time and the burdened cultural heritage of Europe is particularly vulnerable to be left unprotected. Climate for Culture2 project exploits the damage impact of climate change on cultural heritage at regional scale. In this paper the progress of the study with in situ measurements and investigations at cultural heritage sites throughout Europe combined with laboratory simulations is described. Cultural works of art are susceptible to deterioration with environmental changes causing imperceptibly slow but steady accumulation of damaging effects directly impacted on structural integrity. Laser holographic interference method is employed to provide remote non destructive field-wise detection of the structural differences occurred as climate responses. The first results from climate simulation of South East Europe (Crete) are presented. A full study in regards to the four climate regions of Europe is foreseen to provide values for development of a precise and integrated model of thermographic building simulations for evaluation of impact of climate change. Development of a third generation user interface software optimised portable metrology system (DHSPI II) is designed to record in custom intervals the surface of materials witnessing reactions under simulated climatic conditions both onfield and in laboratory. The climate conditions refer to real data-loggers readings representing characteristic historical building in selected climate zones. New generation impact sensors termed Glass Sensors and Free Water Sensors are employed in the monitoring procedure to cross-correlate climate data with deformation data. In this paper results from the combined methodology are additionally presented.
A preliminary investigation has taken place employing Digital Holographic Speckle Pattern Interferometry (DHSPI) in
order to assess the effect of handling and transportation on canvas paintings. Canvas dummies were used on a series of
measurements on a transport simulator which allows reproducible simulation of any transport logs in the laboratory. A
number of cycles of controlled vibrations were applied on the samples and after each cycle a measurement with DHSPI
was taken to monitor the behavior of the samples while increasing the vibration loading and also to record the conditions
under which the first crack appears. The transport simulations in combination with DHSPI monitoring revealed the
amplitude of oscillation where the first cracks appear on new canvas paintings and also the way these cracks grow.
During the tests it was also feasible to locate areas at risk of future deterioration.
This is an introductory paper of a recent EC project dealing with research in cultural heritage and aiming to communicate
new fields of application for optical metrology techniques. The project is in its initial state and more conclusive
information is expected to be available at the time of the perspective conference. Nowadays safety, ethical, economical
and security issues as well as the increase demand for loaning of art objects for exhibitions in transit, are forcing the
Conservation Community to undertake strong initiatives and actions against various types of mistreatment, damage or
fraud, during transportation of movable Cultural Heritage. Therefore the interest directs to the development of innovative
methodologies and instrumentation to respond to critical aspects of increased importance in cultural heritage
preservation, among which of prior consideration are: to secure proper treatment, assess probable damage, fight fraud
actions in transportation.
The deterioration of cultural heritage is of major concern for gallery conditions and loan considerations worldwide.
Artwork deterioration may increase during transportation and exhibitions or mishandling. Decisions about gallery
conditions and loan requirements shall need reconsideration if findings based on artworks undergoing these procedures
prove that impose catastrophic dimensional fluctuations. In this context, non interacting and non contact methods are
useful in order to monitor the continuous changes in the monitored artwork. The presented paper refers to this
application of high importance for the preservation of cultural heritage and forms part of the European project
Multiencode (006427 SSPI).
Holography techniques, in either optical and digital acquisition, are known to allow full field observation of object
point's displacement. In addition to the importance provided by the techniques of revealing hidden discontinuities within
an object, the procedures that have been developed which can be used to visualize and study deformations following
environmentally induced alterations are similarly important. The interferometric formation which results in fringe
patterns which correspond to hidden defects can be used as a key-indicator to control and monitor accidental or
intentional interventions which may effect an object and hence result in an alteration of the originally-revealed fringe
pattern information. Thus, in this paper the specific steps taken to develop an Impact Assessment Procedure for the
assessment and evaluation of the fringe pattern alterations deduced by the implementation of a Digital Holographic
Speckle Pattern Interferometry(DHSPI) system is presented and examples of the application are given.
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