전자기파 반사, 회절, 정상파

소개

This set of four experiments covers various basic properties of electromagnetic waves. The four experiments are first ‘Introduction to the System’. Second, ‘Reflection’, which is an elementary verification of the law of reflection; Third, ‘Standing Waves’, to measure wavelength of microwave, and finally ‘Refraction through a Prism’, in which Snell’s law is used to calculate the index of refraction of a material.

목차

Ⅰ. Introduction

Ⅱ. Theoretical Background
1. Introduction to the System
2. Reflection
3. Standing Waves
4. Refraction
5. Electromagnetic Waves
6. Polarization

Ⅲ. Experimental Procedure
1. Experiment #1 Introduction to the System
2. Experiment #2 Reflection
3. Experiment #3 Standing Waves
4. Experiment #4 Refraction through the Prism

Ⅳ. Experiment Results and Analysis
1. Experiment #1 Introduction to the System
A. Magnitude of Electromagnetic Wave related to the Distance
B. Magnitude of Microwave by Changing the Angle Difference between the Receiver and Transmitter
C. Magnitude of Electromagnetic Wave According to the Position of the Reflector
D. Investigating the Signal Distribution
2. Experiment #2 Reflection
3. Experiment #3 Standing Waves
4. Experiment #4 Refraction through the Prism

Ⅴ. Discussion
1. Experiment #1 Introduction to the System
2. Experiment #2 Reflection
3. Experiment #3 Standing Waves
4. Experiment #4 Refraction through the Prism

Ⅵ. Error Analysis
1. Measurement
2. External Influences
3. Suggestions for Reducing Error

Ⅶ. Conclusion

Ⅷ. References

본문내용

External Influences
Since this experiment is about the investigation of the property of electromagnetic waves, the surrounding electronic devices are crucial for experimentation. Computer monitors, cell phones, and any other electronic devices can emit some magnitude of electromagnetic waves which can alter our experimental data.
Moreover, we the experimenters made somewhat disturbance to the precision of the measurement. That is, we could obviously see that when one of us were close enough to the goniometer between the transmitter and the receiver, the meter reading of the receiver were significantly disturbed. Even though, we were cautioned not to be near receiver, we think the slightest disturbance were inevitable.

Suggestions for Reducing Errors
For more precise experiment, the best thing that we can think of is to prepare longer cable for the interface and spatially separate computers, the interface, and any other electronic devices related to the experiment away from the actual equipment setup.
Moreover, if there is a digital PASCO interface system that measures angular displacement, just as how motion sensor measures the transverse displacement, we think we can pursue more precise experiment.

Ⅶ. Conclusion

In this experiment, we confirmed many characteristics of microwave.
The intensity of microwave is proportional to the inverse of square of distance (I∝1/R^2)
We measured the polarization of microwave and confirmed that the microwave is a plane wave.
In reflection, microwave’s incident angle is same with reflection angle.
We calculated the wavelength by the equation related to the microwave. The wavelength was 0.285m.
We calculated the index of prism by using the property of refraction of microwave.

참고자료

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