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PHYWE Interference of Microwaves |
Learn about:
- Wavelength
- Standing wave
- Reflection
- Transmission
- Michelson interferometer
A microwave beam, after reflection from a metal screen or glass plate, interferes with the primary waves. Wavelength is then determined from the resultant standing waves.
If a microwave falls on the surface of a glass plate, part of the wave is reflected and the remainder enters the glass. At the rear surface, partial reflection and transmission again occur. If two glass plates are placed parallel to each other and perpendicular to the microwave beam, interference occurs as with reflection at the screen. If a receiver is set up behind the two glass plates, the interference spectrum is obtained as a function of the spacing of the glass plates.
The small intermediate maxima are interference maxima between the outer surfaces of the glass plates (plate thickness 0.4 cm), while the principal maxima belong to the interferences at the opposing faces of the two plates.
If the experimental set up is altered so that the observations are made in reflection instead of transmission, the maxima and minima are interchanged, because of the phase change at reflection. If an incident microwave is divided into two coherent waves and if the partial waves are brought of interference through reflection at metal plates, intensity maxima and minima are formed as a function of the position of the screens.
For detection, the microwaves (9.45 GHz) are amplitude-modulated, either internally with a frequency of 50 Hz or externally with any desired (LF) frequency. With constant modulation (Frequency and amplitude), the signal demodulated with a receiving diode (e. g. 50 Hz) is proportional to the field strength and is measured directly with the digital multimeter. Through superimposition (interference) of the microwaves, e. g. through reflection, standing waves are produced, so that the LF signal measured with the receiving diode reflects the interference structure and can thus be used to measure the wavelength. Since the incident and reflected waves from the screen are generally of different intensities, total extinction should not be expected.
Includes microwave transmitter; microwave receiver; microwave receiving dipole; microwave power supply, 220 VAC; protractor scale with pointer; glass plate, 200 x 300 x 4 mm; metal screen, 300 x 300 mm; plate holder; G-clamp; meter scale 1000 mm; tripod base; barrel base; support rod; right angle clamp; multirange meter with amplifier; adapter, BNC-plug/socket 4 mm; connecting cords; and manual on CD-ROM.
For your convenience this experiment is available to you as a complete set.
Everything you require to perform the activities are included in the total price.
For assistance in using your new equipment we also offer professional development (WLS1808-24) on all PHYWE line products.
For customization options and pricing please contact your local Cenco representative.
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