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so this video is supposed to be about the sonar that i made it's actually working really great and i will show this however while conducting my experiments during the last month i just realized how many modern technologies are based on the same physical principles so if you're curious to find out what starlink medical ultrasound and even stone skipping have in common this video is for you this video is sponsored by isla a few years ago i tried to use a car proximity sensor to perform a scan of my lap it was a super simple project but i quickly found out that it doesn't work because the beam is too wide to get any detail a few months back i wanted to revisit this idea with a new approach the way these ultrasonic distance sensors work is that they send out a short 40 kilohertz pulse and measure the time until the echo returns since we know the speed of sound we can calculate the distance to the obstacle the frequency is not audible to humans unless you're a batman however this 40 kilohertz pulse is similar to a wave on the water surface just like the highs and lows on the surface of the water the sonic wave creates high and lows in air pressure you can even create a simple experiment levitating stuff on these pressure waves but that's a topic for another day the problem is that the wave is spreading in all directions and we can't tell where the echo is coming from these transducers seem directional but they are still made to detect a wide range to not hit anything with your car that's slightly off axis of the sensor so since working with these wide angles won't work like that we need to use some tricks so what is the solution if one transducer is not good enough take more transducers a few years ago i stumbled upon a video on youtube about phased arrays even though the name didn't sound as catchy the tech behind this was really fascinating instead of only using one pile source we can take several sources creating a narrow directional beam the math looks scary at first but there are really simple ways to demonstrate what happens there so back to our example using one source we get a perfect circular wave however using two the waves overlap they are basically adding up so low and high cancel each other out while high and high or low and low amplify each other this is also called interference if we look closely we might be able to see regions with stronger waves now the interesting part is if we change the timing of the pulses the direction of those is changing [Music] maybe we can get a clearer view in the simulation so what we got here is a constant wave with one source red are highs and blue are lows this is basically like...