qoustion about sonar

[Transistorman]

hi
i want to know about the difference between
IR range finder
and ultrasonic range finder ?

 

[audioguru]

IR is infrared light. Sunlight interferes.
Ultrasonic is high frequency sound. High frequency sounds interfere.

 

[Transistorman]

IR is infrared light. Sunlight interferes.
Ultrasonic is high frequency sound. High frequency sounds interfere.

what is the more accurate and the longest detecting ?

 

[Transistorman]

please anyone ?
i need to select between them two

 

[audioguru]

please anyone ?
i need to select between them two

Didn't you look at them in Google?
The Sharp IR rangefinder sensor is in-accurate and is used in cheap robots. If many readings are taken and averaged then the result is fairly accurate.
Ultrasonic rangefinders are as acccurate as the frequency of their quartz-crystal clock since then measure how long it takes for a reflection to be returned.
The power of the beam determines the longest range.
The material that causes the reflection also determines the range since a matt black object does not reflect IR well and an absorptive soft object does not reflect ultrasonics well.