Electromagnetic Radiation

PIRA classification 5N

Grayed Demos are either not available or haven't been built yet

Please note that these tables have not yet been edited to match the equipment that is available within the UW-Madison lecture demo lab. There maybe many items listed within these tables that we either "can not do" or have available.

5N10. Transmission Lines and Antennas

PIRA #

Demonstration Name

Abstract

5N10.10

transmission of power

Five 200 W bulbs connected in series along resistance wire.

5N10.10

model transmission line - lamps

Six lamps are connected across two thin wires strung along the lecture bench.

5N10.10

voltage drop

Voltages are measured successively across four 300 W bulbs.

5N10.13

drift velocity

Move a Hall specimen perpendicular to the magnetic field in the opposite direction to the drift motion of carriers with exactly the drift velocity compensates for the Hall voltage.

5N10.15

HV line model

5N10.15

H.T. transmission

A model transmission line with a lamp for a load that shows a loss unless transformers are used to boost voltage up and back.

5N10.16

power loss in transmission line

A circuit demonstrates that the efficiency of power transmission increases with increased voltage. Variac, light bulb bank, meters, line resistance. Reference: AJP 21(2),110.

5N10.20

model transmission line - phase

A model transmission line is made of a series of sixty series inductors and shunt capacitors. An oscilloscope is used to show delay times and phase relationships.

5N10.21

wave propagation

A demonstration of wave propagation in a toroidal transmission line with periodic variation of the wave phase velocity around the line.

5N10.22

wave propagation in aluminum

Show amplitude decay and change in phase for waves propagating through an aluminum wedge or large sheet.

5N10.25

dispersion in non-inductive cable

A model cable made of 150 series resistors and parallel capacitors shows delay and dispersion with meters at each end.

5N10.26

dispersion circuit

A set of T filters with the input and output impedances matched are used to show dispersion of a short pulse.

5N10.27

dispersion of an EM pulse

A microwave demonstration where as a sine wave burst is generated and the dispersion is observed in a slotted line waveguide with a sampling scope.

5N10.30

reflections in a coax

5N10.30

propagation in a coax

A circuit using a wetted-contact mercury relay gives a pulse with a very fast rise time.

5N10.30

pulses on a coax

Reflections in a coax using the Tektronix 545A delayed trigger.

5N10.30

propagation velocity in coax

Using a square wave generator and oscilloscope, propagation time in 1', 20', and 40' of coax are compared. Diagrams

5N10.40

reflections in a coax

5N10.50

Lecher wires

A 80 MHz generator is coupled to a long transmission line and standing waves are demonstrated with neon and filament lamp probes.

5N10.50

Lecher wires

Standing waves are set up on parallel wires from an 80 MHz generator.

5N10.50

Lecher wires

Standing electromagnetic waves are coupled from an UHF oscillator to parallel wires.

5N10.50

Lecher wires

Standing waves are generated on parallel wires by a radio transmitter. An incandescent bulb placed across the wires indicates voltage maxima.

5N10.52

Lecher bars

Two six foot iron rods are used in a Lecher system with a fluorescent lamp detector.

5N10.55

microwave standing waves

Measure the wavelength of a microwave transmitter by using a movable mirror to set up standing waves.

5N10.55

microwave standing waves

Standing waves are set up between a microwave transmitter and a metal sheet. The receiver is moved between the two and the signal strength is displayed on a LED bar graph.

5N10.60

radiation from a dipole

A flashlight bulb on a dipole detects radiation from an 80Mhz generator.

5N10.60

radio waves

Show radiation with a 100 MHz dipole transmitter and hand held dipole receiver with a flashlight bulb detector.

5N10.61

radiation and polarization

Polarization of radiation from a dipole antenna is checked with a hand-held dipole antenna with lamp indicator.

5N10.63

dipole radiation computer simulation

R.H Good report on his Apple II dipole radiation simulation. Excellent and free.

5N10.65

directional antenna

A directional antenna for use with a UHF oscillator.

5N10.70

waveguide normal modes

Morie pattern type demonstration of normal modes in a waveguide.

5N10.80

EM vectors

A dynamic model for demonstrating electric and magnetic vectors in an electromagnetic field. Picture, Diagrams.

5N20. Tesla coil

PIRA #

Demonstration Name

Abstract

5N20.10

induction coil

The small handheld induction coil.

5N20.12

induction coil

A small Cenco induction coil.

5N20.13

induction coil

All sorts of stuff on induction coils - producing high voltage from a DC source.

5N20.15

spark coil

A discussion of the construction of a large spark coil and the effects of reversing polarity.

5N20.25

hand held Tesla and lamp

Light a fluorescent lamp by touching with a hand held tesla coil.

5N20.25

hand held tesla and lamp

5N20.40

Tesla coil

1,000,000. Volt tesla coil.

5N20.41

continuous wave Tesla coil

A tesla coil is coupled to an oscillator coil from A-32 or A-36.

5N20.42

Tesla coil

Directions for building a Tesla coil and many demonstrations possible with it are described.

5N20.43

Tesla coil

Directions for building a Tesla coil (Oudin coil when one end is grounded) that will give a thirty inch spark.

5N20.44

Tesla coil

Pictures of two Tesla coils. References: Popular Science, Jan 1946, pp 191-194; Popular Science, June 1964, pp 169-73.

5N20.50

fluorescent light in radiation field

A fluorescent light bulb is held in the Tesla coil radiation field.

5N20.50

Tesla coil

Light a fluorescent tube at a distance, show the skin effect.

5N20.55

electrodeless discharge

Hold a bulb of a gas at low pressure near a Tesla coil.

5N20.60

skin effect

5N20.60

high frequency currents

The skin effect carries enough current to light a bulb held in the hands.

5N20.70

betatron action

An inductive coil replacing the high voltage transformer in the Tesla coil will give a visible beam in a partially evacuated glass bulb.

5N20.75

Tesla coil and spinner

5N20.75

space charge from high freq. corona

Discharge a negatively charged electroscope with air blown from a Tesla coil corona.

5N20.80

Tesla coil and pinwheel

Place a pinwheel on the secondary of a tesla coil.

5N30. Electromagnetic Spectrum

PIRA #

Demonstration Name

Abstract

5N30.10

project the spectrum

Project white light through a high dispersion prism.

5N30.10

projected spectrum with prism

White light is projected through a high dispersion prism.

5N30.10

project the spectrum with prisms

The optical path for projecting a spectrum using glass or liquid filled prisms.

5N30.10

project the continuous spectrum

A carbon arc or concentrated filament lamp is used as a source with prism optics.

5N30.10

white light with prism

Project a slit of light through a prism or hollow prism filled with carbon disulfide.

5N30.15

ultraviolet spectrum

A carbon arc is projected through quartz optics and prism to a screen of half white paper and half fluorescent paper.

5N30.30

microwave transmitter & receiver

A 12 cm transmitter and receiver are demonstrated.

5N30.30

microwave homebrew - 13 cm

Build a high quality source and detector for $25. Explicit instructions.

5N30.30

microwave unit

A LED bar graph indicates signal strength as a microwave transmitter is rotated around a receiver and as the beam is blocked by a metal sheet.

5N30.31

microwave wavelength by phase diff.

Listen for minima as a second transmitter is moved back and forth a wavelength.

5N30.33

microwave resonance

A modulated signal from a HP 616A generator is passed through a cavity to a detector with provisions to modify the cavity.

5N30.40

penetration of X-rays

Use the ionization method with an electroscope to show penetration of X-rays.

5N30.41

absorption coefficents

Show the thickness of various materials needed to cut the intensity of a beam in half.

5N30.50

IR camera and remote control device

5N30.50

water attenuation of microwaves

A plexiglass box between the transmitter and receiver has no effect until filled with water.

5N30.50

microwave absorption

Place dry and wet cloths in the microwave beam.

5N30.52

IR control devices

Demonstrations

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