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Müller-Platte Needle Probe
Piezoelectric 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 gauge 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.

Müller-Platte Needle Probe

Still today this hydrophone is the Gold Standard for pressure measurements of water shock waves. Within these years the Müller-Platte gauge 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 and long cables > 3m we offer our special high bandwidth Charge Amplifier, MCPA 10, which runs cable lengths up to 150 m.

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 our Charge Amplifier MCPA 10
Connection :BNC pos.
Recording:To a 1 MOhm Input
Ordering information
Article-No. 100-100-1:Müller-Platte Needle Probe with 2 m cable and BNC plug

For special applications the gauge 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.

Calibration results
Application on a focusing shock wave field in a lithotripter
Measuring shock waves from cavitation bubbles

Müller-Platte Needleprobe
Incident and reflected shock wave in water

Recomendations to Improve Shock Wave Lithotripsy

Dr. Müller Instruments
Hasengarten 35
61440 Oberursel

Tel.: +49 - 6172 - 380 37 27
Fax: +49 - 6172 - 177 077 4
Mobil: +49 - 171 - 431 9060