Minimum distance b/w reflecting surfaces(mirrors) which gives output to same IRsensor

Hi !
Can any one give me an idea that how close i can use magnets /also mirrors so that they don't interfere with each other.When i put used IR sensor in such away that multiple reflecting mirrors are rotating around it then what is the minimum distance between two reflecting surfaces(mirrors) so that we can get the differentiated output?

Thanks in advance

Ali

Hiya Ali - I'm afraid I don't quite understand your question. In general though, there is *no* minimum distance that needs to be observed between mirrors and sensors, provided they:

a) don't obviously occlude* the beam path, and
b) are sufficiently large to capture the beam energy (i.e. 1 mm mirrors aren't going to be very useful in steering a beam with a spot size of 20 mm).

Don't forget you'll likely need focussing optics if you want your IR sensor to capture all of the incident energy if the beam size exceeds your detector area/aperture.

What are you differentiating? Where do magnets figure in your optical setup?



(*These things can be more accurately quantified if required, and allowable occlusions vary depending upon the propagating optical mode. These considerations can be safely ignored for most opto-mechanical sensing type applications

In my sceme i am using multiple magnets on the moving curved ring and getting the output through a Hall sensor placed on the static portion under it.
Similarly i am using multiple mirrors on the moving curved ring and getting the output through a IR sensor placed on the static portion under it.

I am using multiple magnets/multiple mirrors in order to enhance the resolution of my scheme.My question is whether i can use multiple magnets/mulitple mirrors and at how much distance.


Sorry for any ambiguity !!!
Waiting for kind reply
Ali

In my view you need to look this problem with many dimensions -
1) Strength of Radiations
2) Reflectivity of Mirror for IR radiations
3) Divergence of your Radiations
4) Positions where sensor receiver kept

I think these points are the key to answer your questions....

Refer the link below may help you -

http://www.coregravity.com/html/detecting_obstacle_with_ir__in.html
http://www.rentron.com/PicBasic/infrared_object_detection.htm

Good Luck