Medci E Flashcards
(30 cards)
What happens to all rays of light in optical fibres?
All rays of light are totally internally reflected.
What is the effect of the glass not being 100% transparent in optical fibres?
Some wave energy is gradually absorbed.
What is the signal intensity like when light reaches the end of the fibre after several kilometres?
The intensity is still large enough to measure a signal.
What can reduce the loss of intensity in optical fibres?
Carefully made joints between fibres.
What is required for installing optical fibres?
Specially trained technicians with the right tools and equipment.
What types of jointing can be used when installing optical fibres?
Permanent or temporary.
What does the reliability of signal transmission in optical fibres depend on?
The quality of joints between fibres and to the optical transmitter and receiver.
Where can substantial loss of signal occur in optical fibres?
At the joints between fibres or if the cable is damaged.
What percentage of signal can still be boosted by an optical amplifier after several kilometres?
1%.
What do optical amplifiers do?
Increase the intensity of light without converting it back into an electrical signal.
What is the application of fibre optics in medicine mentioned in the text?
Endoscopes.
What are endoscopes used for?
To see inside a body organ.
Through which openings can endoscopes be inserted?
Throat, nose, ear canals, or anus.
Fill in the blank: The _______ of the optical fibre is where total internal reflection occurs.
core
True or False: Signal is gradually lost over the length of the optical fibre.
True.
What happens to all rays of light in optical fibres?
All rays of light are totally internally reflected.
What is the effect of the glass not being 100% transparent in optical fibres?
Some wave energy is gradually absorbed.
What is the signal intensity like when light reaches the end of the fibre after several kilometres?
The intensity is still large enough to measure a signal.
What can reduce the loss of intensity in optical fibres?
Carefully made joints between fibres.
What is required for installing optical fibres?
Specially trained technicians with the right tools and equipment.
What types of jointing can be used when installing optical fibres?
Permanent or temporary.
What does the reliability of signal transmission in optical fibres depend on?
The quality of joints between fibres and to the optical transmitter and receiver.
Where can substantial loss of signal occur in optical fibres?
At the joints between fibres or if the cable is damaged.
What percentage of signal can still be boosted by an optical amplifier after several kilometres?
1%.
