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Topic: detecting a reflective surface (Read 273 times) previous topic - next topic

Arman5592

Hi !
I wanted to make a robot for junior Robocup , but this robot needs to detect a "reflective silver tape" at some point to understand that it has entered the second phase of the field.
I have watched a couple of videos of these robots but its impossible to understand how they manage to detect this reflective tape, and information on these is scarce on the internet.

The first idea was to use IR sensors , but I dont believe its possible to differentiate between a "white" and a "silver,reflective" surface with conventional IR sensors.

My next idea whose feasibility is under question at this point was to use a colored LED (for instance red) to shine on the surface and use a color sensor (which is present beneath the robot for other reasons) to detect the reflective surface , but then again I cannot be certain if there is a difference between a glossy white surface and a reflective silver surface in such a situation.

The biggest problem is that the properties of this "tape" are unknown to me , so I wont be able to test any of my guesses and Ill have to choose some option which seems more reliable.

Id be grateful if anyone could advise me which way to go (or a completely different way)
thanks!
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jremington

#1
Dec 01, 2018, 08:39 pm Last Edit: Dec 01, 2018, 08:40 pm by jremington
Quote
I dont believe its possible to differentiate between a "white" and a "silver,reflective" surface with conventional IR sensors.
I have discovered that my personal beliefs are often proven wrong by the results of experiments. Yours might be subject to the same principle.

One popular approach is to get a sample of the tape from the people who sponsor the competition, and test different sensors until you find one that works reliably.  Or ask someone from the previous competition how he/she solved the problem.

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