P1e Infrared Signals
- Specification
- Lesson Plans
- Questions
- Resources
- Extras
Describe uses of infrared radiation:
- in remote controls (TV, video, DVD,) automatic doors;
short distance data links for computer or mobile phones.
State that infrared sensors detect body heat and are used for:
- burglar alarms
- security lights
State the two types of signal used to transmit data:
- analogue;
- digital.
Recognise, in the context of optical fibres, when Total Internal Reflection (TIR) happens:
- glass-air, water-air or perspex-air boundary.
Recognise and describe how light and infrared radiation can both travel along an optical fibre from one end to another by reflection.
Describe the differences between analogue and digital signals:
- analogue signals have a continuously variable value;
- digital signals are either on (1) or off (0).
Describe, in the context of optical fibres, what happens to light incident on a glass-air, water-air or Perspex-air boundary below, at and above the critical angle.
Describe how light and infrared radiation can both travel along an optical fibre from one end to another by Total Internal Reflection (TIR).
Describe the transmission of light in optical fibres:
- optical fibres allow the rapid transmission of data;
- optical fibres allow the transmission of data pulses using light.
Describe advantages of using digital signals:
- to allow more information to be transmitted because of multiplexing (interleaving of many digital signals on the same data line);
- less interference (noise not recognised and amplified).
Describe the application of total internal reflection in fibre optics:
- drawing and interpreting simple ray diagrams.
Describe advantages of using optical fibres to allow more information to be transmitted:
- multiplexing;
- lack of interference.
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Homework1
Lesson ID:
Starters:
Objectives:
Prior Learning:
Difficult Concepts:
Outline:
Suggested Practicals:
Extension Activities:
Homework:
Homework2