Calibration method used for measurements with an open PEA set-up

Different detection systems based on the pulsed electro acoustic (PEA) method have been developed in the last past few years to study space charge distribution in electron irradiated materials. In particular, a set-up working in contact less mode allowing the measurement to be done in open-circuit (where one surface of the irradiated sample is at a floating potential, so-called "open PEA") has been put forward recently. A reference signal is required in any case in order to get quantitative data. The calibration protocol adopted in the case of the classical PEA method, where the sample is under short-circuit condition, cannot be used any more in the "open" configuration. This paper deals with the description and validation of the procedure used to record a proper reference signal to treat raw data obtained with the "open PEA" set-up. Results recorded under various conditions will be compared.