While studying about reflections and transmission coefficient in a discontinuous Media I came across two definition of coefficients one which seems to be correct according to me as it is in accordance with the physics but there is another definition which I have found in many books and used in many papers. Consider a case, when wave is incident from low impedance medium 1 to high impedance medium 2. Then as per my understanding, the amplitude of incident wave should decrease as it goes from low to high impedance ( given by relation 2 below). But if I use relation 1, the amplitude of transmitted wave increases as we go from low to high impedance and that is not possible.
Z1 and Z2 are impedance of two media
- Relation 1:
R=Z2−Z1Z1+Z2,T=2Z2Z1+Z2
- Relation 2: R=Z1−Z2Z1+Z2,T=2Z1Z1+Z2
Could someone please clarify my doubts and discrepancy in the relations that I found?
Reference
- Kinsler. Fundamentals of Acoustics.
No comments:
Post a Comment