A method of measuring power of intermodulation products produced by reflection of an electromagnetic wave on a non-linear object, wherein a measuring device is used, comprising: - a first electromagnetic source emitting from a first focus a first electromagnetic wave comprising at least one component, called first fundamental component, - a second electromagnetic source emitting from a second focus distinct from the first focus, a second electromagnetic wave comprising at least one component, called second fundamental component, - a non-linear object disposed so as to be able to be irradiated by said first fundamental component and second fundamental component, and to form an electromagnetic wave, called enriched wave, comprising said first fundamental component, said second fundamental component and components, called intermodulation components (29, 30), - an electromagnetic receiving device adapted to produce at least one signal, called measurement signal, representative of at least the power of at least one component of an electromagnetic wave received by this receiving device, - the measuring device being arranged in at least one spatial configuration, called measuring configuration, in which said enriched wave propagates at least in part up to the receiving device, characterized in that, the enriched wave having a space-variable composition, it comprises: - a first measuring step in which the measuring device is arranged in a first spatial configuration, called first measuring configuration, adapted such that said receiving device produces at least one first measurement signal for a first portion having a first composition of the enriched wave, - and at least one second measuring step in which the measuring device is arranged in a second spatial configuration, called second measuring configuration, distinct from said first measuring configuration, adapted such that said receiving device produces at least one second measurement signal for a second portion having a second composition of the enriched wave distinct from the first composition of the enriched wave. - a first electromagnetic source emitting from a first focus a first electromagnetic wave comprising at least one component, called first fundamental component, - a second electromagnetic source emitting from a second focus distinct from the first focus, a second electromagnetic wave comprising at least one component, called second fundamental component, - a non-linear object disposed so as to be able to be irradiated by said first fundamental component and second fundamental component, and to form an electromagnetic wave, called enriched wave, comprising said first fundamental component, said second fundamental component and components, called intermodulation components (29, 30), - an electromagnetic receiving device adapted to produce at least one signal, called measurement signal, representative of at least the power of at least one component of an electromagnetic wave received by this receiving device, - the measuring device being arranged in at least one spatial configuration, called measuring configuration, in which said enriched wave propagates at least in part up to the receiving device, - a first measuring step in which the measuring device is arranged in a first spatial configuration, called first measuring configuration, adapted such that said receiving device produces at least one first measurement signal for a first portion having a first composition of the enriched wave, - and at least one second measuring step in which the measuring device is arranged in a second spatial configuration, called second measuring configuration, distinct from said first measuring configuration, adapted such that said receiving device produces at least one second measurement signal for a second portion having a second composition of the enriched wave distinct from the first composition of the enriched wave.