This is really neat—thanks for sharing! I love the general idea of making materials more "self-aware" or inspectable. It's very sci fi! The research I did before my current job touched ever so slightly on this too, so even cooler to see it on the front page. What we were doing was using complex valued neural nets to learn the transmission matrix of an optical fibre. It was previously done in the optics community by p…
Show HN: I made a new sensor out of 3D printer filament for my PhD
111–120 of 138 posts
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#112My reasoning is that you'd increase the resolution without adding too much technical complexity.
My maths is too rusty to evaluate how it would mess with the gray code though.
Very nice idea
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#113> also be doable in 3 years I would like to add more color to this. 3 year PhD is very possible for a motivated individual at, what I'll call, the low end of R1 universities. That doesn't mean you cannot do good research (the OP is a counterexample) but that there is a fundamental difference between the program that the OP went to and top-tier universities. Think Harvard, Berkeley, Stanford, etc. It is normally prett…
Also, top non-US universities often graduate their engineering students within 3-4 years of commencing, with 3-4 papers being a very common international expectation as well.
If you want to finish a PhD in 3 years and are interested in academia, in addition to following the path the OP has laid out you may also look to good international universities and then get your next 3-4 papers as a postdoc.
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#114Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#115What an absolutely amazing idea, great work! Your sensor data seems to have quite large "dead zones" - those should be trivially fixable by reducing the inter-sensor distance, right? Would it be useful to sense the direction of the bend? I reckon this might be possible by dividing the tube like a Mercedes logo, and having three sets of the sensor in one outer tube. Is there a way to sense multiple bends? With the cur…
Great ideas! Even though I haven't implemented it fully it is possible to sense multiple bends because each bend will always have the same relative attenuation (across the strands) so it would just be a matter of matching on the relative deltas from one reading to another. The catch, though, is at that at some point no light will reach the end if every joint bends a lot. There are ways to mitigate that, but my commen…
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#116Isn't this just the same tech as the first Nintendo Power Glove had? https://www.youtube.com/watch?v=3g8JiGjRQNE They put light down a tube and then measured the light to trigger a key press. That's why bending your fingers/hand did anything. The revised the mechanism in the later generations.
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#117I don't understand what happens when the sensor is bent in more than one location. At the beginning you mention a ToF sensor, which made me think that you're looking at reflections from the bends and measuring distance to them, but this seems not to be the case. ISTM that if you bend the sensor in two places, you'll simply get the sum of the logattenuations from both. If we assume that the "strength" of the bend cont…
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#118Earlier quoted context omitted.
I can die happy if I never have to work with libgnipgnop again
But have you used the new 3.6 release which uses pfnaphell integration to stochastically pre-convolute the tertiary nodes? It's a game-changer!
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#119> also be doable in 3 years I would like to add more color to this. 3 year PhD is very possible for a motivated individual at, what I'll call, the low end of R1 universities. That doesn't mean you cannot do good research (the OP is a counterexample) but that there is a fundamental difference between the program that the OP went to and top-tier universities. Think Harvard, Berkeley, Stanford, etc. It is normally prett…
In my experience in computer engineering in the academic systems of the USA, New Zealand, and Australia, a very large proportion of students will write their first paper in their first year. It is field dependent, but when I was a postdoc at a top US R1, 100% of the students I interacted with had their first paper in their first year. These even included students working on LLMs :-) Also, top non-US universities ofte…
Typically, non-US universities have 3 year undergrads and 2 year masters prior to PhD. End-to-end, you are looking at the same time. There are, of course, exceptions. UK I think shaves off a year by integrating undergrad and masters.
Hiding the years or a PhD by doing an extended postdoc is barely the point of the exercise. The median time for a CS PhD in the US is 7 years [1]. Subtract 2 years for good students but add a year postdoc and I think you have a realistic 5-6 years from start of PhD to first academic position for the top decile.
[1] - https://ncses.nsf.gov/pubs/nsf22300/report/path-to-the-docto...
Re: Show HN: I made a new sensor out of 3D printer filament for my PhD
#120This is really neat—thanks for sharing! I love the general idea of making materials more "self-aware" or inspectable. It's very sci fi! The research I did before my current job touched ever so slightly on this too, so even cooler to see it on the front page. What we were doing was using complex valued neural nets to learn the transmission matrix of an optical fibre. It was previously done in the optics community by p…
could it detect a twist instead of a bend?