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Les langues disponibles
Optics
Fibroptonic
Ref : 202 012
1 Purpose
To convert signals of different nature, carry information, display.
The transmitter emits an infrared signal of 0.85 micrometers wavelength, but the initial
information that has created this signal can be of a different nature: electrical, acoustic,
light, etc. At the receiver end, the infrared signal is converted into an audible acoustic signal
or an electrical signal, which can be viewed on an oscilloscope. The spectral response of
the fibre is quite wide. The fibre also transmits radiations located in the visible region.
2 Experiment no. 5
Propagation through optical fibre. Detection of a light signal.
Figure 10: Detection of a light signal by the receiver
ENGLISH
FIBROPTONIC
ELECTROMAGNETIC SIGNAL IN AN
2.1 Equipment
•
Fibre
•
Receiver
•
6, 9 or 12 V DC power supply
•
Pocket torch (or helium-neon laser)
2.2 Set-up and experiment
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Power the receiver (red and black terminals)
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Connect the fibre to the receiver (the transmitter unit is not used)
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Illuminate the end of the fibre with a pocket torch (figure 10).
Pocket torch
2.3 Observations and conclusion:
•
The red LED of the receiver must come on.
•
The optical fibre has transmitted the light information to the photoreceptor. The
light signal whose maximum emission is at about 0.57 micrometers has been
detected. Thus the fibre does not transmit only infrared signals.
PROPAGATION OF AN
OPTICAL FIBER
Receiver
Optical fibre
48
SHEET
03
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