Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Emmanuel Le Clezio

Frank Fournel

Vincent Larrey

Gilles Despaux

Ali Dekious

Emilie Deloffre

The invention relates to a method for checking an assembly comprising first (W) and second (W) joined substrates, comprising the following steps: a) transmitting an ultrasonic excitation signal towards the assembly by means of an ultrasonic transducer () located on the front face (A) side of the first substrate (W); b) measuring, using the transducer (), an ultrasonic feedback signal including at least one echo (EF) of the excitation signal on the rear face (B) of the second substrate (W); c) calculating, using a processing circuit (), a spectral signal representative of the change in frequency of an overall reflection coefficient of the assembly, defined as the ratio between the feedback signal measured in step b) and the excitation signal; and d) deriving, from said spectral signal, information relating to the quality of the bond between the first (W) and second (W) substrates.

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Les Matelles, France

Emmanuel Le Clezio