Müller-Platte Needle Probe

Piezoelectric PVDF Hydrophone for High Frequency Ultrasound- and Shock Wave Measurements in Liquids

Typical Applications

The Müller-Platte Needle Probe was invented at the University of Aachen 1985 for measurements of low energy water shock waves for developing the kidney stone lithotripter and for focusing ultrasound waves.

This special micro gauge based on pvdf is designed for high-energy ultrasound measurements as well as for recording blast waves in water up to some kbar. With its half spherical head, small sensitive diameter (less than 0.5 mm) and the very short rise time of about 50 ns the hydrophone is the ideal device for distribution measurements in focal regions of ultrasonic transducers or e.g. kidney stone lithotriptors. Other applications are measurements of laser generated shock waves, cavitation effects or applications in medical and military research.

Still today this probe is the Gold Standard for pressure measurements of water shock waves. Within these years the Müller-Platte Needle Probe has demonstrated its reliability and durability in multiple experiments worldwide, especially under very short shock wave pressures.

For recording the signal we recommend a direct connection to the 1 MOhm inputs of the recorder. For very small pressures, quite long signal duration and longer cables than 3 m we offer our special high bandwidth charge amplifier, MCPA 10, which runs cable lengths up to 150 m.

Müller-Platte Needle Probe

Incident and reflected shock wave in water

Technical Data

• Pressure range:

  -100 to 1500 bar (-10 to 150 MPa)

• Sensitive element:

  Piezoelectric PVDF

• Rise time:

  50 ns

• Sensitive diameter:

  <<0.5 mm

• Sensitivity:

  About 0.3 pC/bar or 1 mV/bar incl. 2 m cable

• Bandwidth:

  0.3 – 11 MHz ± 3.0 dB

• Temperature range:

  Max. 60°C

• Calibration:

  Shock wave calibrated up to 20 bars in water. (const. sensitivity could

• be verified up to 320 bar):

  calibrated on the incident shock wave

• Tube diameter:

  1.2 mm at the tip, 4.0 mm for mounting, stainless steel

• Cable:

  2 m coaxial cable; for longer connections please use charge amplifier MCPA 10

• Connexion:

  BNC pos.

• Recording:

  To a 1 MOhm Input

• Article-No.:

  100-100-1 Müller-Platte Needle Probe with 2 m cable and BNC plug

For special applications the hydrophone can be delivered in almost any wished size and shape, different cable lengths (shorter) or connectors.
Please give detailed information (incl. drawing) about your desired application and ask for a quotation.