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Sensors & Probes

PU Regular

1/2" PU regular, sound intensity probe

The PU Regular is the world’s first probe to measure sound pressure and particle velocity physically at the same point. Give your product an edge by unleashing the complete potential of a PU probe to quantify, visualize and localize your sound sources even in the most demanding testing environments.


  • Broad Band | 20Hz -10kHz
  • Compact
  • Low susceptibility to P/I
  • Low susceptibility to environment


  • Noise Source Identification
  • Sound Intensity
  • Sound Power
  • PVL measurements

Thorough sound field analysis with high spatial resolution

The Microflown PU probe is able to simultaneously measure multiple acoustic properties such as sound pressure and particle velocity at any point of a sound field. As the first probe that can directly capture the complex acoustic behavior present in the near field, detailed acoustic information becomes easily available to accurately find and quantify the acoustic output of multiple sound sources. The broadband response of the probe covers the complete frequency range from 20 Hz to 10 kHz, without the need of introducing any assumptions or computational errors.

Sound intensity probe with two sensors embedded in one probe

The PU Probe, a sound intensity probe is the combination of two sensors: a traditional microphone and a Microflown. The working principle allows the operation of the probe in-situ in real operating conditions without the need for special acoustically treated environment. Furthermore, the sensor is applicable in wide range of scenarios like reverberation conditions, closed cavities like for example, car interiors, to carry out measurements to study the sound field, localize the sound sources or the contribution of sound sources to a particular position i.e. sound source ranking.


Sensor performance Sound Pressure | Particle Velocity
Sensitivity 65 mV/Pa | 30 V/(m/s)
Frequency Range (±1 dB) 40 - 8000 Hz
Frequency Range (±2 dB) 20 - 10000 Hz
Maximum Level 112 dB | 125 dB
Noise floor (20 Hz - 2 kHz) 22 dB(A) | 27 dB(A)
Noise floor (20 Hz - 10 kHz) 27 dB(A) | 43 dB(A)
Environmental Sound Pressure | Particle Velocity
Temperature range -20 to 63 °C
Temperature Coefficient 0.067 dB/°C | 0.006 dB/°C
Influence of Humidity (30 - 90%) 0.05 dB/%RH | 0.06 dB/%RH
Static Pressure Coefficient < 0.5 dB/kPA
Maximum airflow 1.5 m/s
Physical dimensions
Connector type 7 pin LEMO
Weight 36.7 g
Diameter 12.7 mm (1/2 inch)
Length 89.5 mm