Need some help with a photodiode question

[bigmark1972]

I want to build a sensor similar to the image below. I am only using this image to help represent the concept.

Imagine a second 'curtain assembly' place in front of the first and rotated 90 degrees.

My objective is to determine the position of a part approx 1/4" sphere as it falls through the two assembly's.

I realize a simple light curtain can not do this for me as it views the light beams as one single beam.

I am wanting to be able to determine which of the light streams on each the x and y plane have been broken by the object. This should let me calculate the position of the part.

I would estimate the distance of each side of the two sensors to be under 5 feet and possibly under 3 feet. I am wondering if I could use low cost UV photo diodes or phototransistors and uv led's as the light source to accomplish this?

I would like to keep costs down if possible, also the parts are moving quite fast so I need it to have a fast response time also.

I'd appreciate any input or if anyone knows a better solution please chime in.

I think a laser sensor would work but would be expensive. I am also wondering if a machine vision system could accomplish this but the parts are moving very fast and these are also very expensive.

Basically I am wanting to know if this would be feasible.

I thank anyone who can help.

 

[itsmoked]

Please do not cross post! It causes confusion with responders.
Most members look at a large number of fora regularly.

Please visit:
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with any responses.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[bigmark1972]

I'm sorry, I was not thinking (late night) won't happen again.

'Mark