3 ms·
> useful in most environments today because our homes and offices have false positives littered all over the place Like the structural elements in your house/a
by diggan 2y ago
> useful in most environments today because our homes and offices have false positives littered all over the place
Like the structural elements in your house/apartments have something similar to diodes in them, or what are you referring to?
- hoistbypetard 2y agoI think a lived-in place has enough stuff in and near the walls to make this kind of scan less than useful. We have things hanging on the walls that'd distort it. Maybe an empty one would be OK now, but I think the ecobees all over the place would even distort it for those.
- mannykannot 2y agoI had a vague recollection that rectifiers for battery chargers were once made out of stacked layers of oxidized copper disks, and then, in the article danbruc linked to, I saw this: Note that other semi-conducting materials, such as a rusty nail or an oxidised piece of metal, also generate harmonic frequencies and may therefore cause an NLJD to generate a false positive. https://www.cryptomuseum.com/df/tscm.htm#nljd https://www.cryptomuseum.com/df/tscm.htm#nljd It turns out that the rectifiers in question were copper - cuprous oxide - lead sandwiches: https://hackaday.com/2022/04/20/copper-rectifying-ac-a-century-ago/ https://hackaday.com/2022/04/20/copper-rectifying-ac-a-centu...