to add to the device of fig1 means to modulate the signal transmitted by transmission means 100 at the modulation frequency fm1 this modulation frequency fm1 can be identical to or different from the modulation frequency of the electromagnetic signal received by the material 150 these means are similar to modulation means 140 hereinbefore mentioned and described in relation to fig4 and 5 moreover a variant of the embodiment of the present invention proposes modulation means that present the following modulations fm1 fm1 1 fm1 2 fm1 i with u201c i u201d corresponding to the n th sensor the modulation means are arranged on the signal path between transmission means 110 and the material to be analyzed 150 they spatially sample the electromagnetic signal transmitted by transmission means 110 into as many signals as there are sensors in the array of modulation means a double modulation of the electromagnetic signal at the carrier frequency fp is thus obtained for each transmission point of the electromagnetic signal the signal having passed through the material is received by the collection of sensors 200 of the array of modulation means 140 the signal collected on the sensor thus corresponds to different electromagnetic signal paths having passed through the material 150 the collection of electromagnetic signal paths passing through the material 150 between all sensors of the two arrays is thus measured point to point this makes it possible to achieve multistatic tomographic imagery in the analyzed material 150 and to obtain reconstructed images of high quality fig3 shows a control device of material 150 in reflective mode.