Influence of the acquisition method on terahertz tomography

Terahertz tomography is a technique used in the field of contact-free and non destructive testing [1][2]. It can be achieved using a raster scanning system with three axes or two axes and a rotation stage. The setup uses a Gunn diode working at a frequency of 84 GHz as a source and a Schottky diode or pyroelectric element for the detection. A tripler can be added to the source to obtain a frequency of 252 GHz. The sample is hold on a rotating stage θ mounted on a two axis (X, Y) scanner. We propose to characterize the origin of the electronic noise induced by fluctuations in the detector and analyze the influence of the acquisition method on the reconstructed image in tomography.