Elec

Topics: Electromagnetic radiation, Optics, Polarization Pages: 19 (2173 words) Published: April 19, 2014
Electricity

Electromagnetic Oscillations and Waves

Diffraction and polarization of microwaves 4.5.06-00
What you can learn about …
Diffraction
Focal point
Linearity
Circularly and elliptically
polarized waves
Transverse waves
Polarizer and Analyzer
Constructive and destructive
interference

Principle:
The equivalence between visible light
and microwaves as special cases of
the total spectrum of electromagnetic waves can be demonstrated using diffraction and polarization of
microwaves as an example. The
focusing of microwaves through a
plane convex convergent lens is
observed and the focal distance of
the lens is determined. After that,
polarizability of micro waves is demonstrated by means of a metallic grating.

What you need:
U in mV

Microwave transmitter with clystron

11740.01

1

Microwave receiving dipole

11740.03

1

Microwave power supply, 220 VAC

11740.93

1

Universal measuring amplifier

13626.93

1

Polarisation grid

06866.00

1

Convergent lens, synthetic resin

06872.00
08218.00

1

Voltmeter 0.3...300 V-, 10...300 V~

07035.00

1

Screened cable, BNC, l = 1500 mm

07542.12

1

Connecting cable, 4 mm plug, 32 A, red, l = 50 cm

07361.01

1

Connecting cable, 4 mm plug, 32 A, blue, l = 50 cm

07361.04

1

Connecting cable, 4 mm plug, 32 A, red, l = 200 cm

07365.01

1

Connecting cable, 4 mm plug, 32 A, blue, l = 200 cm

07365.04

1

Adapter BNC socket/4 mm plug pair

07542.27

150
X

X

1

Protractor scale with pointer

l = 30 cm

1

X
X

Tripod base -PASS-

02002.55
02006.55
02009.55

1

Bench clamp -PASS-

02010.00

X

l = 40 cm

X

X

l = 20 cm

without lens

X

X
X

50

X

X

X

X

1

H-base -PASS-

with lens
100

1

Barrel base -PASS-

X
X

X
X

2

Support rod -PASS-, square, l = 250 mm

02025.55

1

Support rod -PASS-, square, l = 630 mm

02027.55
02040.55

4

Stand tube

02060.00

1

Meter Scale, l = 1000 x 27 mm

03001.00

X

X

X

X

X

X
X
X

-8

-7

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

l = W-So
in cm

4

Right angle clamp -PASS-

X

1

Complete Equipment Set, Manual on CD-ROM included
Diffraction and polarization of microwaves P2450600

Profile of the intensity of radiation.

Tasks:
1. Measuring the irradiance of the
microwave field behind a converging lens
– along the optical axis
– transversally to the optical axis.
Determination of the focal length of
a synthetic resin converging lens and
comparison of the results with the

PHYWE Systeme GmbH & Co. KG · D - 37070 Göttingen

distribution of irradiance when no
lens is used.
2. Measurement of the irradiance
transmitted through a metal grating as a function of the angle between the direction of polarization and the grating bars.

Laboratory Experiments Physics 211

LEP
4.5.06
-00

Diffraction and polarization of microwaves

Related topics
Diffraction, focal point, linearity, circularly and elliptically polarized waves, transverse waves, polarizer, analyzer, constructive and destructive interference.
Principle
The equivalence between visible light and microwaves as special cases of the total spectrum of electromagnetic waves can be demonstrated using diffraction and polarization of microwaves as an example. The focusing of microwaves through a plane convex convergent lens is observed and the focal distance of the lens is determined. After that, polarizability of microwaves is demonstrated by means of a metallic grating.

Equipment
Microwave transmitter w. klystron
Microwave receiving dipole
Microwave power supply, 220 VAC
Universal measuring amplifier
Polarisation grid
Convergent lens, synthetic resin
Protractor scale with pointer

11740.01
11740.03
11740.93
13626.93
06866.00
06872.00
08218.00

1
1
1
1
1
1
1

Voltmeter,...
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