|
Thermal tribology!
A tricky experimental set-up allows to contactlessly measure the temperature
of the friction contact.
Potassium bromide (KBr) is one of the few materials that is transparent
to infrared radiation. When pressing a small plate made of KBr against a
rotating plastic ball, one "sees" with a thermal imaging camera, the
temperature of the friction track (green-yellow ring). The camera looks
through the plate on to the ball surface. In the friction contact, where
the ball touches the plate, the temperature is higher. The hot spot can
be seen as a small red dot.
Now here the very difficult Christmas Riddle question: What does the
camera "see", if a small plate of window glass is used for the test instead
of KBr? The fact that both materials are completely transparent in the
visible light, unfortunately does not help any further.
When you send us the correct answer you will receive a small
tribological gift.
Depending from Jan. 11, 2012 you will find the riddle’s answer under:
http://www.tillwich-stehr.com/en/home/christmas-riddle-2011/answer.html
As well as in the years before we refrain from sending picture
calendars to our customers. With the according amount of money
we support the work of the donation ‘German Children Cancer Aid’.
Good luck, health
and a happy 2012 !
|
