Capacitively coupled electrical substitution for resistive bolometer enhancement

Matthieu Denoual (1) , Sébastien Delaunay (2) , Gilles Allègre (1) , Didier Robbes (1)

1 Equipe Electronique - Laboratoire GREYC - UMR6072
2 GREYC - Groupe de Recherche en Informatique, Image et Instrumentation de Caen

A new electrical substitution method for resistive bolometers is proposed to operate them in a closed-loop configuration. This method was implemented and evaluated with a resistive bolometer based on metallic layers over a 120 μm thick glass membrane. Based on an electrical substitution (ES) directly at the place of the resistive sensing element, the new method allows for space savings and a simplification of the technological manufacturing while maintaining the time response improvement linked to a closed-loop operation. Compared to a previously available ES solution, this new method is applicable to all resistive bolometers. Time response and signal-to-noise ratio (SNR) were evaluated through measurements and compared for three operation configurations of the resistive bolometer: open loop, classical ES closed loop and with the proposed capacitively coupled electrical substitution (CCES) closed loop.

Mots clés: bolometer; electrical substitution; thermal feedback

Domaines: Electronique

Matthieu Denoual, Sébastien Delaunay, Gilles Allègre, Didier Robbes. Capacitively coupled electrical substitution for resistive bolometer enhancement. Measurement Science and Technology, 2009, pp.015105. ⟨hal-00980248⟩