#acl Narf:read,write,delete,revert,admin FacultyGroup:read,write All:read == Electromagnetic Radiation == ''PIRA classification 5N'' ||<#dddddd>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 = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''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 ||pira200||A dynamic model for demonstrating electric and magnetic vectors in an electromagnetic field. Picture, Diagrams. || = 5N20. Tesla coil = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''Abstract''' || ||5N20.10 ||Tesla coil / induction coil ||pira200||The small handheld induction coil. Take the spectra tube and hold it within 2 feet of induction coil. Vary the distance. Repeat with the fluorescent tube. || ||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 = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''Abstract''' || ||5N30.10 ||project the spectrum || ||Project white light through a high dispersion prism. || ||5N30.10 ||projected spectrum with prism ||pira200||White light is projected through a high dispersion prism and on to a screen. || ||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]] [[Instructional|Home]]