Circuito elétrico baseado no circuito da ponte wheatstone ativa para detecção de radiações ionizantes de baixas energias

Abstract

In this work, the construction of an electronic circuit was carried out, in order to increase the sensitivity of reading the current response of the ionization chamber, to detect low energy ionizing radiation. The sensitivity obtained by the circuit used the active Wheatstone bridge principle, which consists of a Wheatstone bridge circuit using operational amplifiers. The effective changes of this work were in the change of the circuit, which applies the same concepts of the bridge, however applied in meshes of commercial capacitors, using one of the capacitors as an ionization chamber, for the incidence of radiation. The circuit was interpreted seeking to change the capacitive and resistive reactance of the chamber, with this, the response of the change in the voltage balance of the capacitors will no longer be null with the incidence of ionizing radiation in the sensor. Finally, it obtained the impedance response of the circuit for sine and square waves, thus obtaining a linear response for energies between 9 keV and 25 keV in sine waves.