To content
ACOUSTIC SENSORS & TESTING SOLUTIONS
Sound Sources | VVS

Low frequency VVS

LVVS | DIRECT VOLUME VELOCITY MEASUREMENT, 30Hz - 500Hz

The low frequency volume velocity source is an omni-directional sound source which behaves like a acoustic monopole with controlled source strength. The sound source has a particle velocity sensor mounted at the end of the duct to accurately measure its broadbanded acoustic output. The frequency range covered by this source goes from 30 Hz up to 500 Hz. A power amplifier is supplied with this volume velocity source.

Features

  • Frequency range 30 Hz - 500 Hz
  • High power output: max. Sound Power of 122 dB
  • Direct volume velocity measurement
  • Integrated particle velocity sensor
  • Fast reciprocal transfer function acquisition

Applications

  • Acoustic Transfer Functions
  • Panel Noise Contribution Analysis
  • Transfer path analysis
  • Airborne source quantification
  • Sound package evaluation
  • Component vibro-acoustic characterization

Curious About Pricing Details?

OMNI-DIRECTIONALITY THAT PROVIDES DIRECTION

This omni-directional noise source is equipped with a Microflown particle velocity sensor on the tip of its nozzle, being the only source capable of directly measuring the radiated volume velocity for a broad frequency range with unparalleled accuracy. The source is capable of generating high excitation levels in order to properly excite the sound field under study. This Low Frequency Volume Velocity Source can be used for a wide range of applications like transfer path analysis, component vibroacoustic behavior characterization, airborne source quantification and pass by noise simulations

Cross-compatibility with all major third party software platforms

The reference sensor incorporated in all Volume Velocity Sources (VVS) is natively supported by all modules of Microflown's software Velo. In addition, with the recent introduction of a programmable signal conditioner (MFPA-VVS), the sources can also be used seamlessly with the following software platforms:

  • Head acoustics ArtemiS SUITE
  • Müller BBM PAK 6.x
  • Siemens Simcenter Testlab

MFPA-VVS

The MFPA-VVS is a 1-channel signal conditioner is especially designed for our Volume Velocity Sources. The MFPA-VVS main usage is to power and amplify the received particle velocity signal to 1 channel line level BNC output. However with the MFPA-VVS there is more, thanks to its build-in correction its provide a flat, corrected output. Enabling compatibility and ease of use with most common use sound and vibrations software's.

How does it work?

MFPA-VVS integrates a bank of programmable filters before the pre-amplification stage of the traditional MFPA. The filtering stage (2 high-pass and 2 low-pass filters) compensates the natural frequency-dependent sensitivity of particle velocity sensors, achieving a broadband correction at the output of the MFPA-VVS for the entire frequency range. The corner frequencies of the filters can be adjusted by the manufacturer every time the sensor (VVS source) is calibrated. Please be aware that the MFPA-VVS has to be exclusively used with one single volume velocity source, and therefore this pre-amplifier is not interchangeable.

SPECIFICATIONS

Performance
Frequency range 30 - 500 Hz
Sound power level 122 dB re 1 pW
Sound pressure level @1 m 111 dB re 20 uPa
Maximum input signal (RMS) 40 V
Driver impedance 8 Ohms
Physical
Height 44.5 cm
Nozzle ∅ 15 cm
Casing ∅ 33 cm
Weight 11.8 kg
ACOUSTIC SENSORS & TESTING SOLUTIONS