4. Improving sensor performance

Several sensor series have been developed as part of previous collaborations.

To carry out measurements in conditions of low fission gas concentration (even for pure helium) and for an internal pressure level equivalent to that of a fresh fuel rod, we need to optimize the sensor's sensitivity. To achieve this, we use the stacking model presented in the original article [ IN 113 ], modifying the model parameters :

• layer thicknesses (piezo/blade/water/tube) ;

• electromechanical...