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Fiber Optic Probe Hydrophone FOPH 2000 PVDF hydrophones Measurement examples

PVDF hydrophones

PVDF hydrophones use the piezoelectric effect for the pressure/voltage conversion. The polymer Polyvinylidenfluorid (PVDF) becomes piezoelectric when it is mechanically stretched and exposed to a strong electric field. A small piece of piezoelectric PVDF foil is attached and electrically contacted to the tip of the hydrophone. This is the pressure sensitive element of the measuring instrument.
PVDF hydrophones can be used for measurements in the low pressure region up to maximum 10 bar. The use in cavitation fields may lead to a damage of the hydrophone.
Our PVDF hydrophones are calibrated with a calibration sound source in a water basin. The acoustic field of the sound source is controlled by the Fiber Optic Probe Hydrophone FOPH 2000.

PVDF Hydrophone

PVDF hydrophones

Two different types of PVDF hydrophones are available:

Type s
Diameter of the pressure sensitive area: 1 mm
(Higher spatial resolution, lower sensitivity)
Type l
Diameter of the pressure sensitive area: 3 mm
(Lower spatial resolution, higher sensitivity)

The PVDF hydrophones are delivered with the calibration data and a coaxial cable of 1.5 m length. The coaxial cable connects the hydrophones to the high impedance input of an oscilloscope. For the measurement of sound signals with very low pressure amplitudes we offer a hydrophone amplifier with an amplification of 40 dB or 60 dB (switchable).

Summary of the technical data

Hydrophone Type s
Spatial Resolution
1 mm
3 mm
typ. 150 ns
typ. 150 ns
typ. 1 kHz to 3 MHz
typ. 1 kHz to 3 MHz
Single pulse pressure resolution
typ. +/- 5 kPa
typ. +/- 0.7 kPa
typ. 20 mV/MPa
typ. 150 mV/MPa
+/- 15 %
+/- 15 %
Temperature range
10 °C to 35 °C
10 °C to 35 °C

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