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Optics
Fibroptonic
Ref : 202 012
4 Experiment no. 11
Examining a spectrum with an optical fibre.
ENGLISH
4.1 Equipment:
•
Slide projector
•
Slit of 1 mm cut out into a 5x5 cm cardboard.
•
A diffraction grating of 140 lines/mm or a glass prism
•
Receiver
•
Fibre
•
6, 9 or 12 V DC power supply (the transmitter is not used)
•
Oscilloscope.
4.2 Set-up and experiment:
•
Power the receiver
•
Place the vertical slit in the slide projector
•
Focus the image of the slit on the cardboard screen located at 1.5 m
(approximately) from the projector.
•
Fix the diffraction grating (vertical lines) against the projector's lens. Many coloured
bands are visible; these are white light spectra in different orders of the diffraction
grating (single spectrum with a prism)
•
Move the screen in such a way that many spectra are half cut by the upper edge
of the screen; examine the 1
tangentially to the screen.
•
To view the received signal, connect an oscilloscope (switch on DC) to the yellow
and black terminals of the receiver.
Diffraction grating (or prism)
Slit
Slide
projector
Figure 15: Examining a white light spectrum with an optical fibre
st
order spectrum by moving the end of optical fibre
Spectra
Optical fibre
Receiver
55
Power supply
6,9 or 12 V
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