MONO-DIMENSIONAL STRESS MEASUREMENT

Piezoelectric polyvinylidine fluoride sensors (PVDF) are the sensors of choice for a wide range of measurement applications because they have unique characteristics:

·         RAPID RESPONSE                  (nanoseconds)

·         LARGE STRESS RANGE (kPa to GPa)

·         LARGE SIGNAL TO NOISE RATIO

·         SENSITIVITY                          (3-4µC/cm² for 10GPa)

·         VERY THIN                           (~25µm)

·         SIMPLE CIRCUITRY

Figure : 1 mm² PVDF shock gauge.

·         REPRODUCIBILITY - The sensors are all made from a high quality biaxially stretched polymer material, poled by the patented ISL-Bauer process to provide a stable and consistent polarization. Sputtered gold over chromium electrodes permit precise active area measurement.

·    CALIBRATION - These are the only PVDF sensors that are supported by extensive shock calibration data. The data range from a few kPa to over 20 GPa, and have been verified by Associate Professor M. Arrigoni of ENSTA Bretagne.

·         USER SUPPORT - The AIFP, ENSTA Bretagne staffs have significant experience in all aspects of PVDF fabrication and use. We stand ready to support your experimental efforts. We provide the guidance you need to apply the transducer to your experimentation or we can fabricate a complete transducer tailored to your needs.

Specifications :

Thickness:          25µm           Source capacitance:   5pF/mm²

d₃₃:                   20 pC/N        Leads resistance:     10W each

All these characteristics are measured for each sensor.

Figure : Shock gauge specifications.

Possiblility to develop OEM solutions, sensor matrix, other sizes on demand...

Poled P(VDF-TrFE) sheets and P(VDF-TrFE-CTFE) sheets can be produce in small quantities upon request.