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Thanks both for your replies. Encap, why wouldn't multiple lasers be an option? For an example, on the base line of a tennis court, why couldn't you shine a laser across to detect 'out' and simply create a circuit for when the beam distance is 'cut-off'?

Would appreciate it if anyone could suggest some ideas! thanks

Something like this. so there is a single laser but beaming multiple times across in the direction of the arrows

Just wondering if people could help me with any ideas here. Is there a way that you could beam a laser repeatedly perpendicular to a line? E.g. could you have 1 laser in the corner of a tennis court baseline which shines width ways across the court repeatedly up to the net? Current ideas would...