Article Dans Une Revue Notes of the web Année : 2022

Improved image processing for electromagnetic infrared thermography

Résumé

In the 1980s, an electromagnetic infrared method was initially developed at the US Air Force Academy (USAFA) and the University of Colorado at Colorado Springs (UCCS) that produced the first images of EM fields made by an Infrared camera measuring the heating of absorbing materials. In the 1990s, this field imaging method was then enhanced by the French Aerospace Lab ONERA, under the registered name "EMIR", as an electric field measurement technique by introducing synchronous modulation of the EM incident signal. EMIR provides two-dimensional representations of the electric field, through a quasi-instantaneous measurement. This can be useful for fast characterization of radiating sources, especially in the microwave frequency range. In addition, it is capable of imaging subwavelength details. In this paper, a digital signal processing scheme is proposed that consists of applying a temporal and spatial filtering to the video signal. Considering the trade-off between additive noise, uncertainty over system parameters and optical transfer, the signal-to-noise ratio can be improved by up to 8 dB. Further, the advantages of a chirp modulation signal over a single frequency lock-in thermography system is demonstrated.

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hal-03740285 , version 1 (29-07-2022)

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  • HAL Id : hal-03740285 , version 1

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Tobias Baumgartner, Daniel Prost. Improved image processing for electromagnetic infrared thermography. Notes of the web, 2022. ⟨hal-03740285⟩

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