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After coming across a 2004 installation by Carsten Nicolai titled "anti" where he used a theremin as an element for presence sensing, I was wondering if this principle could be extended to greater distances.

Let me better explain: would it be possible to use the principle of the theremin antenna for sensing the presence of people inside a room (not simply hands on short distance)?

I imagine an application in interactive multimedia context on which I would be very interested to learn more.

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    \$\begingroup\$ Yes, it's possible. Two thin people = 1.5 fat folk. \$\endgroup\$
    – Andy aka
    Commented Dec 7, 2021 at 16:01
  • \$\begingroup\$ Sure that's possible, you might need to change the shape of the antenna and the frequency it operates at. Also know that movement/presence detectors using an antenna already exist, I'm thinking about a small microwave "radar" sensor like this: smart-prototyping.com/index.php?route=product/… My point: you don't specifically need a theramin device for this. Also know that a theramin is (from an electronic viewpoint) just a proximity sensor controlling an oscillator. \$\endgroup\$
    – Bimpelrekkie
    Commented Dec 7, 2021 at 16:18
  • \$\begingroup\$ You can use antenna to detect and track people in rooms. Wifi people sensing for example uses WiFi the detect people moving around rooms. See: arxiv.org/pdf/1901.00715 \$\endgroup\$
    – user1850479
    Commented Dec 7, 2021 at 16:19
  • \$\begingroup\$ Is your end-goal to just sense movement in a room, or to use a sensor's output to modulate some multimedia device? A burglar alarm can sense movement, but it may not yield a satisfying analog output for multimedia - its output is on or off. So tell more of your end-intentions. \$\endgroup\$
    – glen_geek
    Commented Dec 7, 2021 at 17:02
  • \$\begingroup\$ There are dozens of research papers describing just this, and some of them apply to wifi routers and antennas. \$\endgroup\$
    – Voltage Spike ♦
    Commented Dec 7, 2021 at 17:12

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