What is the Tortuosity?

The tortuosity, or structure factor, is a geometrical measurement of the deviation of the actual path followed by an acoustical wave in a porous material from a direct path in the air.

Tortuosity in a Porous Material

How to Measure the Tortuosity?

Equipment: Ultrasound Tortuosity Meter
Method: Evaluation of tortuosity in acoustic porous materials saturated by air [1, 2]
Parameter: α∞ – Tortuosity​​

Transmission Method for Tortuosity Meter
Reflection Method for Tortuosity Meter

References

[1] J.F. Allard et al., « Evaluation of tortuosity in acoustic porous materials saturated by air, » Rev. Sci. Instrum. 65, 209-210 (1994).

[2] C. Perrot, F. Chevillotte, R. Panneton, J.-F. Allard, and D. Lafarge, « On the dynamic viscous permeability tensor symmetry, » J. Acoust. Soc. Am. 124(4), EL210-EL217 (2008).

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