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TOR – Ultrasound Tortuosity Meter


The ultrasound tortuosity meter (or ultrasound refractometer) is designed to obtain reliable measurements of tortuosity and characteristic lengths of a wide range of porous materials typically used in noise control.  The system uses both ultrasound reflection and transmission methods with 1 or 2 gas (2 gas is optional).

Material properties

➡ Tortuosity

➡ Characteristic parameters


Mecanum’s ultrasound tortuosity meter is used by the world’s leading material suppliers to both the automotive and aircraft industry for:

  • Quality control in the manufacturing process of materials;
  • Research, development, and innovation;
  • Feeding acoustical prediction software dealing with sound absorbing materials.


The system includes two air-coupled ultrasound transducers, one high voltage pulser/receiver system, specimen holders, USB-DAQ and the TOR-X software.  The TOR-X software assists the experimenter during the measurement and calculates the statistics on the measurement of tortuosity and equivalent length. Two ultrasound methods are included: reflection and transmission. The system works with disc shaped samples. To obtain viscous and thermal characteristic lengths, a two-gas method is available as an option.

Main advantages of the product

Measurement method from the scientific literature;

User-friendly interface;


”Turnkey” solution;

Advanced calculation algorithms following the established literature;

Increase the quality of the modelling of acoustic materials;

Automatic calculation of the global statistics.

Other Mecanum’s Related Products

Porous material slicer Circular cutter Enviro Weather station FOAM-X  Tube-X  


More information

➡ Download Flyer

➡ Information and Price