>"Time Of Flight Sensors<p>Recently the cost of these Time Of flight Sensors (TOF) have plummeted and have made a new type of Theremin possible. The TOF sensors are small lasers combined with a very fast photodiode, these clever little devices are able to measure the time that the light from the laser takes to your hand, be reflected, and received by the photodiode. Even more impressive they can do this with millimetre precision."<p>Never knew these existed until reading this(!)... let's learn more about them:<p>Apparently, a "Time Of Flight Sensor" is also called a "Time Of Flight Camera":<p><a href="https://en.wikipedia.org/wiki/Time-of-flight_camera" rel="nofollow">https://en.wikipedia.org/wiki/Time-of-flight_camera</a><p>Now, me I'm wondering if this could be used to make a Gravity Wave detector of some sort... oh sure, it wouldn't have as much precision as an Interferometer specifically created for that purpose... but maybe you could detect <i>something</i>, under <i>some as-of-yet unknown conditions</i>... like maybe if you had a big enough electromagnet or wave emitter or something (or thing that creates or captures or focuses Gravity Waves, no matter how small or faint -- you decide what it is!), maybe you could influence the distance perceived by the device some really small amount (1 millimetre?), which might indicate the presence of an altering/interfering field (Gravity, something else?) of some sort...<p>And then again, maybe not!<p>Still, a very interesting device to potentially experiment with, in different contexts...<p>Great article, too!