The Institute of Acoustics and Sensor “O. M. Corbino” – CNR_IDASC has a long tradition in the development and application of NDT acoustic methods in the cultural heritage field. Since its foundation, CNR_IDASC was involved in studies regarding

• the acoustic quality of antique theatres• the effects of vibration on works of art

• echographic techniques for the subsoil and underwater prospecting archaeological remains.

The specific competences are mainly oriented towards the development of innovative methods for acoustic diagnostics and monitoring, but service activity is also provided by the Institute.In the last decade, the group of Physical Techniques for Cultural Heritage, operating in the Institute, implemented and patented a specific method and the relative device - ACEADD - for the determination of detachments in frescoes, mosaics and glazed ceramic tiles validating the method in laboratory tests on artificial models and by means of in situ measurements . Particular attention is focused on the implementation of packages including

DIAGNOSTIC NDT METHOD – DEVICE - OPERATING PROCEDURE

Acoustic Energy Absorption Diagnostic Device – ACEADD- European Patent EP1190243B1

- US Patent US 6728661

ACEADD – ACOUSTIC ENERGY ABSORPTION DIAGNOSTIC DEVICE

ACEADD: portable device for NDT of fresco detachments based on the ACOUSTIC ENERGY ABSORPTION evaluation

BACK REFLECTION SETTING source S and receiver M in COAXIAL CONFIGURATION and NORMAL

INCIDENCE GEOMETRY working distance from the surface is about 0.5m measure of the abs. coeff. by the determination of the transfer function

( )a w = 1 - |HS(w)|2 DIRECT EXTRAPOLATION of the surface impulse response hS(t) by

means of Cepstrum algorithm signal processing wide band SINE WAVE SWEEP 100Hz ÷ 20kHz it provides 2D and 3D ACOUSTIC ABSORPTION MAPS and ROUGHNESS

MAPS for the LOCALIZATION and CHARACTERIZATION of detachments.

(1)

(2)

(3) (4)

ACEADD – ACOUSTIC ENERGY ABSORPTION DIAGNOSTIC DEVICE

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60%

Cultural Heritage ranks among those particular contexts where the need for interdisciplinarity is more evident. Methodological advancements must be inspired by the principles of scientific metrology, in order to guarantee the quality of the diagnostic methods.

SUPPORT

ADJACENT LAYERS WITH AIR CAVITIES PLACED IN DIFFERENT POSITIONS

DETACHMENTin frescoes

ACOUSTIC MAPPING

ONFRESCOES

IN CASA VASARIFLORENCE

Paola Calicchia - IDASC

Cultural Heritage itself may be the crucible where all the expertises from different disciplines and mix up, with mutual enrichment. Thus, it becomes, not only the final receiver of the benefits of research, but also the background, the subject and the purpose of the transformation of conservation policy into action.

In this way the Cultural Heritage becomes a very particular laboratory for a systematic and synergic approach to conservation science, aiming at a realistic cultural heritage-driven scientific and technological development based on sound metrological data.

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DELAMINATIONin glazed ceramic tiles

ACOUSTIC MAPPINGON

CERAMIC TILE PANELSIN THE RENAISSENCE CLOISTER

AT THE NATIONAL TILE MUSEUM Museu Nacional do Azulejo –LISBON

Paola Calicchia - IDASC