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We know that the Ultrasonic sensors can't accurately measure the distance to an object that

  1. is more than 3 meters away (the distance may vary on brands)
  2. has it's reflective surface at a shallow angle (the angle may vary on brands)
  3. is too small to reflect enough sound

Ultrasonic Sensor

Also the environmental influences such as air tempereture, air pressure, air currents, humidity, mist and types of gas cause inaccurate measurements. Which sensor should i use to get the best measurements ?

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  • $\begingroup$ I assume the question is for indoor, wheeled robot that's trying to self locate or prevent collision. If not, can you add whether it's Indoor or outdoor ? What sort of a distance is relevant? To a wall , to grass? $\endgroup$ – Gürkan Çetin Aug 24 '17 at 10:23
  • $\begingroup$ This is more like a general question. I'd like to keep it that way for those who want to get informed. It can be for both indoor and outdoor. $\endgroup$ – Kitiara Aug 24 '17 at 11:30
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Yes, there are IR sensors as well, which provide ranges up to 3-4 meters Pololu Range Finder. Also, we can find Laser range finders that measure up to 30m distance. But these Laser range finders are expensive in compared to ultrasonic sensors and mostly used for mapping purposes.

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  • $\begingroup$ As far as i remember there are some environmental influences that cause inaccurate measurements for IR sensors as well, such as light. Am i wrong ? I don't have much info about the laser range finders, is there any factor that may lead inaccurate measurements ? $\endgroup$ – Kitiara Aug 24 '17 at 1:50

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