Nils Nitzschke 11.06 - fh-muenster.de
Transcript of Nils Nitzschke 11.06 - fh-muenster.de
Nils Nitzschke 11.06.2012
Lighthouses History Light system
Traffic lights History Light sources Phantom light
historyFirst lighthouse:
Alexandria 280bcHeight 115-160mVisibility range about 40km
First lighthouse in Germany:
Travemünde 1226Height 31mVisibility range about 33km
Light system
Until 1800 fire
1781 Argand hollow wick lamp
1870 Kerosene replaced oil
Since 1900 Electric lightMetal halide lamp (230v /400W)Metal halide lamp (230V / 2000W)Incandescent light bulb (220V / 2000W)
Light systemFresnel lens to produce parallel light
Light system
Position light
Direction light
historyFirst traffic light :London 1868Red and green gas lamp Exploded 2 weeks later
First electric traffic light:Salt Lake City 1914Red and greenDidn’t explode till now
Three color lamps:USA 1920Than Europe
Light sources in traffic lightsThree main types
Incandescent bulb230v / 60WMaintenance every 4 month
Incandescent bulb10V / 20WMaintenance every 6 month
Halogen bulb10V / 20WMaintenance every 6 month
Phantom signalSunlight reflected
on the front surface of the lampinside the optic of the lamp
Appears as if all lights give a signal
Phantom signalMeasures against phantom signal:
•Top cap
•Prismoptic
Phantom signalMeasures against phantom signal:
Lamellae
black top
silver bottom
Phantom signalMeasures against phantom signal:
LED lights
http://www.info-lsa.de/http://www.leuchttuerme.net/http://en.wikipedia.org/wiki/Lighthousehttp://en.wikipedia.org/wiki/Traffic_light