1. REFLECTION AND TRANSMISSION II
PH424 W10 Do not distribute
11/20/2018
REFLECTION AND TRANSMISSION II
Reading:
Main 9.2
GEM 9.1.3
Lecture 4

2. Incident ()+ reflected () Transmitted ()
PH424 W10 Do not distribute
11/20/2018
Boundary
v1 > v2
v2 < v1
Incident ()+ reflected ()
Transmitted ()
Lecture 4

3. Displacement reflection and transmission coeffs!
PH424 W10 Do not distribute
11/20/2018
Solve simultaneously
Displacement reflection and transmission coeffs!
Lecture 4

4. PH424 W10 Do not distribute
11/20/2018
Impedance, Z
Defines Z as the ratio of the applied force to the resulting (material) velocity
For rope system: piston applies force at x = 0 producing wave in direction of +ve x
( = tension)
Lecture 4

5. Impedance proportional to k if t is constant.
PH424 W10 Do not distribute
Impedance, Z is defined as the ratio of the applied force to the resulting (material) velocity
11/20/2018
Traveling wave eqn
Impedance proportional to k
if t is constant.
Lecture 4

6. PH424 W10 Do not distribute
11/20/2018
Lecture 4

7. REFLECTION AND TRANSMISSION -REVIEW
PH424 W10 Do not distribute
11/20/2018
REFLECTION AND TRANSMISSION -REVIEW
Continuity conditions (relationship of positions, forces etc at boundary)
Reflection and transmission coefficients for ,
Reflection and transmission coefficients for ddx,
Free & fixed boundaries,
Phase change at boundary
impedance (mechanical and electrical)
Mathematical representations of the above
Lecture 4

8. Similar to a LCR circuit!

9. 600 m of RG-59 Cable, Open Circuit
incident
reflected
600 m of RG-59 Cable, Open Circuit
open

10. 600 m of RG-59 Cable, Short Circuit
incident
transmitted to outer
600 m of RG-59 Cable, Short Circuit
open
short

11. 600 m of RG-59 Cable, 75 Ohm terminated
gone!!!!
600 m of RG-59 Cable, 75 Ohm terminated
75 W

12. Similar to a LCR circuit!