Low-frequency noise effect on terahertz tomography using thermal detectors. - Archive ouverte HAL Access content directly
Journal Articles Applied optics Year : 2015

Low-frequency noise effect on terahertz tomography using thermal detectors.

Abstract

In this paper, the impact of low-frequency noise on terahertz-computed tomography (THz-CT) is analyzed for several measurement configurations and pyroelectric detectors. We acquire real noise data from a continuous millimeter-wave tomographic scanner in order to figure out its impact on reconstructed images. Second, noise characteristics are quantified according to two distinct acquisition methods by (i) extrapolating from experimental acquisitions a sinogram for different noise backgrounds and (ii) reconstructing the corresponding spatial distributions in a slice using a CT reconstruction algorithm. Then we describe the low-frequency noise fingerprint and its influence on reconstructed images. Thanks to the observations, we demonstrate that some experimental choices can dramatically affect the 3D rendering of reconstructions. Thus, we propose some experimental methodologies optimizing the resulting quality and accuracy of the 3D reconstructions, with respect to the low-frequency noise characteristics observed during acquisitions.

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Dates and versions

hal-01263737 , version 1 (28-01-2016)

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Cite

Jean-Paul Guillet, Benoît Recur, Hugo Balacey, Joyce Bou Sleiman, F. Darracq, et al.. Low-frequency noise effect on terahertz tomography using thermal detectors.. Applied optics, 2015, 54 (22), pp.6758-6762. ⟨10.1364/AO.54.006758⟩. ⟨hal-01263737⟩
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