For a given type of rock, acoustic velocity varies indirectly with porosity.
2.
However, the sonographic instrument assumes that the acoustic velocity is constant at 1540 m / s.
3.
Therefore, any sound field can be reconstructed, if sound pressure and acoustic velocity are restored on all points of the surface of its volume.
4.
The Christoffel Equation is essentially an eigenvalue problem which relates the elastic tensor, c _ { ijkl }, to the crystal orientation and the orientation of the incident light, \ Lambda _ { kl }, to a matrix, \ lambda _ { kl }, whose eigenvalues are equal to ?V2, where ? is density and V is acoustic velocity ..
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