Electromagnetic and ultrasonicinvestigations on a Roman marble slab

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Abstract

The archaeological museum of Rome asked our group about the physical consistency of amarble slab (second to third century AD) that recently fell during its travel as part of anexhibition. We decided to use different methodologies to investigate the slab: namely apacometer (Protovale Elcometer) to individuate the internal coupling pins, andground-penetrating radar (GPR) (2000 MHz) and ultrasonic (55 kHz) tomographichigh-density surveys to investigate the internal extension of all the visible fractures and tosearch for the hidden ones. For the ultrasonic data, tests were carried out to optimize theinversion parameters, in particular the cell dimensions. The choice of cell size for the inversionprocess must take into account the size of the acquisition grid and the ray number acquired.We proposed to calculate a minimum Fresnel’s radius using the sampling frequency instead ofthat of the probes. For every methodology used, the quality of the acquired data was relativelyhigh. This was then processed and compared to provide information that was useful for someof the insurance problems of the museum. Later on, the data was processed in depth to seehow to improve the data processing and interpretation. Finally, the results of this in-depthstudy were exposed in detail. Ultrasonic and GPR tomographies show a strong correlation,and in particular, the inhomogeneous areas are located in correspondence to the slabinjuries.
Lingua originaleEnglish
pagine (da-a)117-125
Numero di pagine9
RivistaJournal of Geophysics and Engineering
Volume8
Stato di pubblicazionePublished - 2011

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology
  • Industrial and Manufacturing Engineering
  • Management, Monitoring, Policy and Law

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