P1e Infrared Signals

(Can-Do Task P1e Infrared Signals Name: ENERGY FOR THE HOME Date: 3 points I can find the critical angle of glass/Perspex. Method Place the glass/perspex block on the back of this sheet. Slowly increase the angle of incidences as shown above. When a spectrum is seen, increase the angle of incidence further until all light is reflected. Measure the angle with a protractor as shown opposite.

Infrared Signals07 June 2010James Ferguson Claydon High School1Infrared SignalsMr Ferguson Year 10 GCSE (Higher) ENERGY FOR THE HOME OCR Gateway Science Suite Lessons 9-10 (P1e)07 June 2010© 2006 James FergusonInfrared Signals07 June 2010James Ferguson Claydon High School2IndexInfrared Signalling Analogue and Digital Digital Pictures Analogue Signals and Interference Digital Signals Interference DVD and CD Players Optical Fibres Multiplex SignalsInfrared Signals07 June 2010James Ferguson Claydon High School3ObjectivesDescribe the differences between analogue and digital signals. Describe the advantages of digital signals. Describe the applications of Total Internal Reflection in fibre optics. Describe advantages of using optical fibres to allow more information to be transmitted.Infrared Signals07 June 2010James Ferguson Claydon High School4Infrared SignallingTelevision remote controls use a digital infrared signal, produced by an infrared emitting diode in the handset.Other devices which use infrared signals: Cordless computer mouse and keyboard Automatic garage doors Burglar alarms Some mobile phonesThe signal is detected by a sensor behind a small panel on the front of the TV.