SUMMARY.
From the Heritage Preservation point of view, consolidation of degraded wooden objects 
is an extreme treatment, applied only when no other solution can guarantee the stability 
of the object.
Usually, conservators establish the degradation level and the result of consolidation, in 
the basis of their own background and, in few cases, with images form the interior of the 
object, such as radiographies.
This way to determine the wood degradation level is subjective, and it is usual to read in 
papers and articles phrases like: wood in poor condition, deteriorated wood; severely 
degraded wood; significant degradation, etc. when conservators want to characterize the 
wood condition.
At first sight, this fact could be considered as not relevant. But if we want to use, as 
reference, the results and conclusions of other conservators, or, if the amount of wood to 
consolidate is too big, so we will notice the importance to have a non destructive method 
to establish both: the degradation level and the improvement reached after the 
consolidation of wood.
This problem was the starting point of this thesis, and we concluded that Eigen frequency 
let us to divide the degradation level in different groups, as well as to establish the 
improvement of consolidation treatment (R2=0,80).
It is important to emphasize the fact that during this investigation we developed an 
equation to figure out the maximum volume of solution (resin-solvent) required to 
consolidate, by immersion, and specific volume of wood.