Help on distance measuring sensors

[John_Correa]

I am an undergraduate and I want to work on sensors. I wanted to build a distance measuring sensor using IR LED and IR photodiode. However I have not experienced much success as the output voltage is not at all consistent. Please suggest a circuit which can do the same using the above components with good reliability and accuracy.

 

[pabloec]

ir has a tremendous noise problem, natural and artificial lights are huge sources of ir noise.

you can use a 18k freq signal to drive you led so by using a filter in the receptor your app is less affected by noise.

 

[prodigyaj]

even i face the the same problem ! can some one tell me ow to accurately measure distance using the IR pair ?

 

[kender]

The only class of IR range sensors that offers an accuracy at all is the triangulating range sensor such as these ones made by sharp

 

[prodigyaj]

anyting apart from sharp that makes us avail these ready made sensors ?
and any idea or circuit on how to have them self made , need not be as accurate as these ready made ones thought ?

 

[John_Correa]

I have a circuit that generates a digital output using IR LED and photodiode regarding presence of an obstacle in a given range. The IR photodiode generates an analog value which is compared with a preset value to determine the existence of any object. Can we modify the same circuit to give an analog output value? Please help.