Towards space charge measurements by (F)LIMM under DC electric field

An evolution of a conventional thermal wave technique for space charge investigation in insulations is presented. Based on a laser diode as source of heat, the set-up has been modified in order to be able to stress electrically samples under study with an external electric field while doing measurements for space charge investigation. After a short presentation of the fundamentals related to the technique, its evolutions towards “on-line” studies are evoked, in particular the fundamental equations associated in this new configuration. In the experimental part of the text are described the new challenges arising with the modified set-up and the solutions proposed. At the end, the conclusion is two folds: the modified bench is not only consistent with the classical one, but also allows a thermal calibration of the technique that will enhance the accuracy of results to come.