1 Reading: Main 9.2 GEM 9.1.3 REFLECTION AND TRANSMISSION.

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Presentation transcript:

1 Reading: Main 9.2 GEM REFLECTION AND TRANSMISSION

2 Animations courtesy of Dr. Dan Russell, Kettering University What happens when a wave encounters a medium where it propagates with a different velocity?

3 Medium changes (i.e v changes) at x = 0 v is one constant for x 0. Need piecewise function for  Traveling wave solutions, with wave incident from the left Frequency must be same on both sides (why?), therefore k changes (and )

4 Transverse force on vanishingly small rope element (massless) must be zero  Rope must be continuous

5  Transverse force on massless rope element is zero  Rope must be continuous

6 x x = 0   T T  Force exerted by left side of rope on right side isForce exerted by right side of rope on left side is Transverse force on vanishingly small rope element (massless) must be zero

7 Solve simultaneously Displacement reflection and transmission coeffs!

8 Boundary v 2 < v 1 v 1 > v 2 Incident (  )+ reflected (  )Transmitted (  )

9 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)

10 Impedance, Z is defined as the ratio of the applied force to the resulting (material) velocity Impedance proportional to k if  is constant. Traveling wave eqn

11

12 Pressure/force and displacement Exercise: Draw  (x,0); p(x,0)

13 Also obeys the 1-D wave equation  it has reflection and transmission coefficients, too! Force reflection and transmission coeffs!

14

15 Electric circuits: force like voltage; ∂  /∂t like current This is where the “impedance” idea is more familiar. A driving voltage produces a current in a circuit; the proportionality constant is the impedance. The various circuit elements produce currents that are in phase with, ahead of, or behind the driving voltage. There are analogies between the electric and mechanical systems. See Main Ch 10 for a comprehensive listing.

16 Z 1 = Z 2 Z 2 = 0Z 2 = ∞ R T RFRF TFTF

17 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 REFLECTION AND TRANSMISSION - REVIEW