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Explosives Quiz

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7 outta 10

some parts of chemistry class were rather interesting :P




I got 9, but guessed on three of them.

"Once we got to the point where twenty/something's needed a place on the corner that changed the oil in their cars we were doomed . . ."
-NickDG

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9/10




Cool! Any guessing?
--------------------

A couple more:


Lasers:

http://www.funtrivia.com/trivia-quiz/SciTech/Lasers-173473.html


Laser Trivia:

http://www.funtrivia.com/trivia-quiz/SciTech/Laser-Trivia-201368.html

"Once we got to the point where twenty/something's needed a place on the corner that changed the oil in their cars we were doomed . . ."
-NickDG

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Lasers-

7/10
7/10
no guesses, just a couple duhhmb moments. I used to operate and maintain CO2 industrial lasers, they can do some very cool stuff. The questions related to those lasers were easy, the others based on actions of the atoms in the resonator cavity, weeellll.. not so good.

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Lasers-

7/10
7/10
no guesses, just a couple duhhmb moments. I used to operate and maintain CO2 industrial lasers, they can do some very cool stuff. The questions related to those lasers were easy, the others based on actions of the atoms in the resonator cavity, weeellll.. not so good.



-------

What's the cavity made of on an industrial CO2 laser?

Is the gas circulated for cooling or anything?

"Once we got to the point where twenty/something's needed a place on the corner that changed the oil in their cars we were doomed . . ."
-NickDG

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Quote

Lasers-

7/10
7/10
no guesses, just a couple duhhmb moments. I used to operate and maintain CO2 industrial lasers, they can do some very cool stuff. The questions related to those lasers were easy, the others based on actions of the atoms in the resonator cavity, weeellll.. not so good.



-------

What's the cavity made of on an industrial CO2 laser?

Is the gas circulated for cooling or anything?



There are two main types of CO2 industrial lasers-

Slow Flow- Gas is moved through the resonator cavity mostly by convection currents with some by adding gas. Gas usually flows axially, ie straight through the cavity. Power output is somewhat limited on these but it is very stable, especially at the low end of the range- less than 20watts.

Fast Flow- Gas is mechanically circulated through the cavity. The mechanical means are usually either a roots type of blower or a turbine. Power output can be very high, on the order of 20kwatts.

Most industrial cavities are also a folded design to decrease the size of the cabinet needed. They also require a cooling jacket around the cavity. The coolant I've seen in use mainly is DowTherm, basically a jazzed up version of antifreeze. Here's an interesting factoid, the main gas in a CO2 laser is Helium, with Nitrogen second and CO2 the least.

There's tons of stuff out there on beam mode, types of exciters, what can/can't be cut with CO2 lasers. (PVC being a huge no/no as it emits cyanide gas as a byproduct.) The lasers we used were in the 2kwatt range and could cut 1/2 steel with no problems.

For more info- here's an interesting site-
http://www.repairfaq.org/sam/laserco2.htm#co2typ0

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