/biz/ - Business & Finance

>>57249369
>>57249756
I wrote my own program for authenticating coins.

>>56228321
I actually described this way back in the very first /pmg/ thread when I had started developing a proof-of-concept. This method uses the Kirchoff thin plate model to simulate gold and silver coins as a vibrating disc and generate the theoretical modal frequencies for them, then you can use a spectrograph to make sure that your actual coins are real by matching the observed frequencies to the theoretical ones. I got the idea from an article I read in the European Journal of Physics:
https://www.researchgate.net/publication/276297204_The_music_of_gold_Can_gold_counterfeited_coins_be_detected_by_ear

>>54568190
That was a great first thread:
>>/biz/thread/S11091458#p11096457
I talked there about the RINGS system that I was developing at the time, which after nearly 5 years I finally got around to learning Python and implementing it as a program (pic related). This method uses the Kirchoff thin plate model to simulate gold and silver coins as a vibrating disc and generate the theoretical modal frequencies for them, then you can use a spectrograph to make sure that your actual coins are real by matching the observed frequencies to the theoretical ones. More on that here:
https://www.researchgate.net/publication/276297204_The_music_of_gold_Can_gold_counterfeited_coins_be_detected_by_ear