I am trying to find a way to generate an infrared plane that is parallel to a table-top and a few millimeters above the table top. When an object crosses the plane I want to be able to sense where in the plane this occurred. I have been looking at some infrared diodes and transistors, but I haven't been able to find anything specific enough for my application. Does anyone know of a way that I could make this possible, or would I have to have some custom optics built?
Thanks
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