| http://www.w3.org/ns/prov#value | - It is to be pointed that that, irrespective of the structure given to the waveguide 8, said waveguide as well as the sensor member 7 operatively associated therewith are typically housed within an auxiliary tubular body 20 of metal material, preferably copper or a Zn+Al+Mg alloy, shown in particular in FIG. 3, although they can form a single structure.
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