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lasers to check perpendicular movement

lasers to check perpendicular movement

lasers to check perpendicular movement

(OP)
I know lasers are used to check how perpendicular the movement is for 2 axes on machine tools.  I just don't know how you set the laser up to measure this.  I understand how interferometry is used to measure a linear distance.  How do you use it to measure a perpendicular movement?

RE: lasers to check perpendicular movement

(OP)
How does that work? Does the stationary beamsplitter have 2 outputs? One inline and one at 90 degrees?

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