TRIBO-EMISSION

[MolaKule]

One form of Tribo-emission is that of X-rays. It has been observed that X-rays are emitted when Scotch Tape is rapidly peeled.

Another form of tribo-emission is that of electrons being generated by frictional contact.

Researchers have placed a diamond tipped stylus on a circular oxidized aluminum sample plate and rotated it. A phosphor coated (fluorescent) screen is placed above it to detect electron emission.

The diamond tip is 100 um in diameter, and the plate is rotated at 44 m/s under a load of 0.4N.

They found that electrons are emitted from the channel when scratched by the stylus.

In terms of a detection tool, what might tribo-electron emission be used?


Guidelines for the Question of the Day:

1. No Piston Cup Lapel Pin will be awarded to the same person within 14 days of a previous award.

2. Please respond with a complete sentence.

3. Please do not post links. If a question arises as to the need for clarification, then sources and links may be requested.

4. Please, no off topic posts.

 

[OneEyeJack]

Low voltage/energy narrow band/frequency x-rays. The band/frequency would be like a color in a chart. Pick the appropriate band for the target and get a detailed image. No need to be locked in a laboratory and no chance of lighting up bystanders. Put this on an assembly line and get real time quality checking. You might have to adjust the material being manufactured to include an element that would help to light up the process but the end result would be worth the trouble.

 

[MolaKule]

Originally Posted By: OneEyeJack
Low voltage/energy narrow band/frequency x-rays. The band/frequency would be like a color in a chart. Pick the appropriate band for the target and get a detailed image. No need to be locked in a laboratory and no chance of lighting up bystanders. Put this on an assembly line and get real time quality checking. You might have to adjust the material being manufactured to include an element that would help to light up the process but the end result would be worth the trouble.


Good answer and is here is another hint:

Quote:
They found that electrons are emitted from the channel when scratched by the stylus.


Suppose I use the word "crack" instead of channel?

 

[OneEyeJack]

Any kind of separation/crack where there exists a difference in potential would light up the process. The trick is to generate the difference.

 

[OneEyeJack]

Any kind of separation/crack where there exists a difference in potential would light up the process. The trick is to generate the difference.

 

[m6pwr]

Radioactive Trace Technology - - as in this testing lab http://www.isp-testing.com/en/?

 

[MolaKule]

This is another one of those marriages between the science of particle physics and Tribology.

The researchers found that cracks along the wear tracks were emitting electrons.

Apparently, electron emission can occur by charge separation during crack formation. So this phenomena could be used to detect crack formation and propagation in situ. ("on site," or "in position," "locally").

As an example of the practical use of this phenomena, this has the potential to detect the onset of cracks and crack propagation in bearing raceways and other hard materials susceptible to crack formation.

Imagine if in a hydroelectric or other plant with large rotating machinery, one could detect the onset of cracks and monitor crack growth and replace bearings and raceways before the machinery failed catastrophically.

So we will reward the BITOG members m6pwr and OneEyeJack who posited an answer

with the Piston Cup Lapel Pin.