Elenco Fiber Optics Voice Data Kit - Manual (Page 21)

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Image conduit produces inverted images
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As you've seen in the previous experiment, heating and bending the fiber optic conduit did not
affect its image-transferring ability. In this experiment you will further heat and modify the shape of the
image conduit to show you another one of its unique properties.
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3 mm diameter × 4.3 cm (1/8 × 1-3/4 inch) image conduit (glass-like rod)
2 Paper binding clips
Isopropyl alcohol*
Paper towels*
Alcohol lamp, Bunsen burner or propane torch*
Cotton gloves or two pads of cloth*
* Not contained in this kit.
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• Clean the image conduit with a paper towel and
isopropyl alcohol. Attach a paper binding clip to each
end of the conduit. Light your heat source and let its
flame stabilize. Put on cotton gloves, or have two
pads of cloth close at hand.
• Place the image conduit into the flame holding the
paper binding clips with gloved hands or pads of
cloth. Heat the mid-section in the top of the flame
until it starts to soften, then straighten the conduit to
remove the bend.
• While still applying heat, twist the conduit so that one
end is 180 degrees (one half rotation) from its original position.
Very little force should be needed or used to twist the conduit.
Turn off the heat and let the conduit cool for five minutes.
• Examine the letters to the right of this paragraph through the
image guide. What has happened to the image at the end of the
conduit? Do the letters through the conduit appear upside down?
When you move the image conduit to the right, which direction
does the image appear to move across the viewing end of the
image guide?
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By heating the image guide and twisting it 180 degrees, you
turned the conduit into what is commonly known as a fiber optic image
inverter. Everything at the viewing of the image conduit appears to be inverted, or rotated it 180
degrees, from the image on the page. (Think of the twists in a candy cane.)
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As mentioned before, heating the fiber optic image guide didn't affect its image-transferring
capability, but it did raise the temperature of the fibers until they became flexible enough to twist.
After heating and twisting it 180 degrees, a single fiber strand at one location on a conduit end will be
moved to an "upside down" position at the other end.
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Based on what you learned here and in an earlier experiment, how could you use heat and a
fiber optic image conduit to make a product that would enlarge or reduce the images that you see on
the opposite end?
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