Detecting a small object in space.

  • Context: Undergrad 
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Discussion Overview

The discussion centers around the detection of a small metal object, approximately 0.5-1 cm³ in size, within a defined 3D space of 25 cm x 25 cm x 25 cm. Participants explore various technologies and methods for accurately detecting and tracking the object, considering factors such as simplicity, speed, and cost.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using radar, lidar, electromagnets, or radio transmitters for detection, expressing a preference for methods that are simple, fast, and cheap.
  • Another participant proposes using magnets and metal detectors for detection within the specified volume.
  • For tracking the object's position, a participant wonders about the feasibility of using an RFID chip combined with highly directional antennas or phase detection for radio signals.
  • Concerns are raised about the limitations of radar in a container, noting the need for fully absorptive walls and a very fast response time.
  • A later reply mentions that inexpensive webcams and open-source software for image processing might be viable alternatives for position detection.

Areas of Agreement / Disagreement

Participants present multiple competing views on the best technology to use for detecting and tracking the object, with no consensus reached on a single method.

Contextual Notes

Participants have not fully explored the assumptions behind the effectiveness of each proposed method, and there may be unresolved considerations regarding the specific conditions of the detection environment.

NewSkol
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Hello,

Unfortunately I am not very proficient in physics, however I got very curious in regards to detecting an object (For the matter of argument let us use a metal object that would be the size range of about 0.5-1cm3) in 3D space.

I am not sure what would be the best way to even start thinking about it?

Radar, Lidar, Electromagnets (The object can contain a magnet), Radio transmitters.

I would like to be able to detect this object rather accurately and I would need to be able to track it. What do you think would the best technology to use be? I am looking for something simple, fast and cheap. (Thus I don't think I want to use cameras, but that would probably be easiest at this point).

Any ideas? Thanks in advance.
 
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How much space?
 
Lets say for example 25cm x 25cm x 25cm.
 
For just detecting an object in a 1 foot cube I might go with magnets and metal detectors.

If you want the position as well, then...hmmmm... I wonder if you could use an RFID chip in your object and some _really_ directional antennas. Or some kind of phase detector for the radio signal. Radar kinda stuff would need fully absorptive walls (if it's a container we are talking about) and a very fast response time -- 1ns per foot. A couple cheap web-cams might be your best option. There's open-source position detecting software for images out there.
 

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