I came across Rubens's tube while wasting time on youtube and I really liked what I saw. I think it is a simple yet spectacular display of physical sound properties. So, I decided to build one my self. My goal is t replace the live flame component of the device with digitally controlled light, so it is easier to handle and can be a nice peace at home, without burning it down
So i finally got around to test the rubens tube more. What I did this time, was noting where are the peaks and the bottoms of the waves when a 400hz is played into the tube. Then I mounted cheap-ass microphones from ebay into three of the positions. Played the 400hz signal into the tube again and inspected the microphone output on an oscilloscope. I was very glad to find out that a clear difference between these points could measured! This measn that I should be able to digitize the tube.