Vectorial Characterisation of Electromagnetic Fields by Infrared Thermography

Abstract

Abstract:EMIR technique is now able to measure the polarisation of EM fields, thanks to highly anisotropic photothermal films. The films and the numerical model used to evaluate their electromagnetic behaviour are described. Based on the use of a model, a thermal optimisation of the sensor, taking into account the amplitude modulation frequency, is presented. The technique is applied to the analysis of the EM field, at 12 GHz, in the vicinity of the end of a wave-guide. Validation is achieved through comparison of the experimental results to theory.

Measurement of the Amplitude and Polarization of the Electric Field by Electromagnetic Infrared Thermography

“…Therefore, to obtain a thermal measurement, the grating had to be parallel to the field, assuming a constant linear field polarization (plane wave condition typically). Finding the direction of the field implied performing many measurements with different orientations of the grating, as in [5] and [6].…”

Mines detection using the EMIR® method

“…Generally the technique is used for monitoring EM fields in the microwave range (centimetre to millimetre wavelengths). The technique has been continuously improved so that it is now capable of measuring both intensity, phase and polarization of the waves [2]. Among the various possible applications, the non-destructive evaluation (NDE) of EM materials has been explored [3].…”