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Microwave Optics012-04630FQuestions1 What spacing between the two Partial Reflectors should cause a minimum signal to be deliveredto the Receiver?2 In an optical Fabry-Perot interferometer the interference pattern usually appears as a seriesof concentric rings. Do you expect such a pattern to occur here? Why? Check to see ifthere is one.26
012-04630F Microwave OpticsIntroductionEQUIPMENT NEEDED:Experiment 9: Michelson Interferometer- Transmitter, - Receiver- Goniometer, - Fixed Arm Assembly- Component Holders (2) - Rotating Table, Reflectors (2)- Partial Reflector (1)Like the Fabry-Perot interferometer, the Michelsoninterferometer splits a single wave, then brings theconstituent waves back together so that they superpose,forming an interference pattern. Figure 9.1 shows thesetup for the Michelson interferometer. A and B areReflectors and C is a Partial Reflector. MicrowavesBAtravel from the Transmitter to the Receiver over twodifferent paths. In one path, the wave passes directlyCthrough C, reflects back to C from A, and then is reflectedfrom C into the Receiver. In the other path, thewave reflects from C into B, and then back through Cinto the Receiver.If the two waves are in phase when they reach theReceiver, a maximum signal is detected. By movingone of the Reflectors, the path length of one wavechanges, thereby changing its phase at the Receiver soa maxium is no longer detected. Since each waveFigure 9.1 Michelson Interferometerpasses twice between a Reflector and the Partial Reflector,moving a Reflector a distance l/2 will cause acomplete 360-degree change in the phase of one wave at the Receiver. This causes the meterreading to pass through a minimum and return to a maximum.Procedure1 Arrange the equipment as shown in Figure 9.1. Plug in the Transmitter and adjust the Receiverfor an easily readable signal.2 Slide Reflector A along the Goniometer arm and observe the relative maxima and minima of themeter deflections.3 Set Reflector A to a position which produces a maximum meter reading. Record, x 1, the positionof the Reflector on the Goniometer arm.x 1= _________________________.4 While watching the meter, slowly move Reflector A away from the Partial Reflector. Move theReflector until the meter reading has passed through at least 10 minima and returned to a maximum.Record the number of minima that were traversed. Also record x 2, the new position ofReflector A on the Goniometer arm.Minima traversed = _________________________.x 2= _________________________.27
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MICROWAVE OPTICS - Granular Materials Laboratory

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