SmartCharge, Store & Hold charge amplifier for the MFC
A piezo electric strain gauge can generate an electric charge proportional to strain. Our SmartCharge is specifically designed as a charge pre-amplifier for such piezo electric devices used as strain gauges.
The measurement of static or low frequency deformations using piezoelectric strain gauges is an engineering challenge. The electric charge generated by a strained piezo electric device will dissipate in a relatively short period of time due to the finite input impedance of many of the used data acquisition circuits.
Smart Material has revisited this problem with a new approach: the Store & Hold technique. It transfers the generated charge to a high-end, leakage-free capacitor. The charge can be measured as a proportional voltage across the capacitance using a load-free, specially designed high impedance operational amplifier. This guarantees constant output signals of up to 3 minutes without any significant drift.