Replies to post #6005 on Arcam AB fka AMAVF

[charlie T colton]

TECHNOLOGY LANDSCAPE FOR IN-PROCESS NDT FOR AM

X-Ray detection is only identified with Arcam

From the UK's Manufacturing Centre - Quality Control for AM Conference, 24-01-2017 - TECHNOLOGY LANDSCAPE FOR IN-PROCESS NDT FOR AM

Dr Ben Dutton (MTC)
Dr Mohd H. Rosli (MTC)
Sarah Everton (MTC, University of Nottingham)

[Tom Joad]

re: Real-time monitoring of laser powder bed fusion

I'm going to need to re-read everything carefully, just not now. That said-

The Arcam patents, if I read them accurately, which isn't a promise when I'm trying to read fast, seem to use the Compton effect to monitor the electron beam itself. They do not mention the Compton effect in the patent that I read. There's an inverse Compton effect, so one can use X-rays (and a spectrum of electromagnetic [particle] wave frequencies) to monitor electron beams, and one can use electron beams to monitor electromagnetic [particle] waves.

The difference in laser verses electron beam monitoring is that laser machines do not operate in a vacuum, so I ask, if you're using electron beams to monitor lasers in the presence of a gas, how do you get accurate results? In a vacuum, or near vacuum, using X-rays (high energy waves) to monitor electron beams with accurate results is possible. Can one use X-rays to monitor lower frequency laser beams? That I would like to know. Theoretically I say yes, but is it technically possible?

Monitoring the powder bed is another matter. You're right, it's there, so they must not have been saying that build monitoring isn't possible in laser bed manufacturing, but that the technology has not been developed yet. But I don't believe it's possible to document processes in the laser machines as completely as in electron machines for the reasons I gave above. In the latter, both the beam and the bed can be monitored, not so [far] for laser. I hope I'm right, because my money is on electron beam and that's one reason, the technology and physics moat.

So many articles, so little time (right now). I hope to read more soon.

Not necessarily off topic, I (Feinman really) submit to you the strange and incomprehensible quantum world, a.e., why the Compton effect, which takes advantage of the particle nature of electromagnetic waves, makes sense in the non sensical quantum world. What's this particle-wave stuff about anyway? Gotta have fun once in awhile.

particle wave dual nature of electrons

Why I kept saying [particle] waves-

Thomson_scattering

Why doesn't the particle wave dual nature of the entire electromagnetic spectrum doesn't make sense? Particles cannot be in more than one place at one time but waves are in more than one place at one time.