- #1
DrBanana
- 51
- 4
I'm trying to make a DIY 'ECG' machine, except that it'll only record heartbeats on a piece of paper. Basically the piece of paper will be wound round a cylinder like object, which will be being spun slowly by a motor. A pencil at the end of a stick or something will be writing to this piece of paper. A section of this stick will rest on top of a funnel that's covered by a cut out baloon, so if that membrane 'jumps', so will the stick, and the reading will be visible on the piece of paper. The funnel will be connected with a tube to another funnel that's also covered by a cut out baloon, and that will be placed on the chest.
So my question is, is this feasible? The chest doesn't really 'jump' that much so even if I did manage to find the perfect tube, would I be able to make the stick jump to a significant degree? I'm hoping that I can do that if I can manage to find a long enough stick (because the 'jump'=hsin(x) increases as the length of the stick h increases, if I'm not mistaken).
So now I need to find a tube that can best carry waves. I haven't really read in depth about elasticity or waves, but if I had to guess I'd say that materials with a higher Young's modulus tend to carry sound waves better. However here I have another question: are sound waves and waves that make things 'jump' identical? I.e. if I have a medium that carries sound well, does it carry the 'jumping' part well? I've bought a section of a hose pipe but haven't gotten to try it out yet, but I don't have much hopes for this.
So my question is, is this feasible? The chest doesn't really 'jump' that much so even if I did manage to find the perfect tube, would I be able to make the stick jump to a significant degree? I'm hoping that I can do that if I can manage to find a long enough stick (because the 'jump'=hsin(x) increases as the length of the stick h increases, if I'm not mistaken).
So now I need to find a tube that can best carry waves. I haven't really read in depth about elasticity or waves, but if I had to guess I'd say that materials with a higher Young's modulus tend to carry sound waves better. However here I have another question: are sound waves and waves that make things 'jump' identical? I.e. if I have a medium that carries sound well, does it carry the 'jumping' part well? I've bought a section of a hose pipe but haven't gotten to try it out yet, but I don't have much hopes for this.
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