A new digital measuring system of ferroelectric hysteresis loop and field induced strain of ferroelectric materials

A new system based on complex programmable logic device (CPLD) to measure hysteresis loop and field induced strain of ferroelectric materials is studied in this paper. Hysteresis loop and field induced strain are two important properties of ferroelectric materials and are very important in the studies of ferroelectric, piezoelectric and electrostriction materials. CPLD is a kind of integrated circuit (IC) that can be programmed many times by the user and works more effectively than application specific integrated circuit (ASIC) does. In this new system, CPLD is introduced to ferroelectric measurements. The flexibility of the measuring system can be greatly improved. Software compensation is more convenient to process data than hardware compensation. The principle of software compensation is studied in this paper. Compared with the previous analogous system, this new system is programmable in hardware and functions more effectively in data processing.