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Principle of focal length measurement

2014-12-4 | Editor:Xian optical Metrology | Views:2494 | Content Source:Editor by the company

Definition of focallength

 The distance between the front and back focuses and the principal point is called the focal length. Collimator projects the cross to a plane at infinity. The sample will produce a reticle image on the focal plane. The size of the reticle image depends on the focal length of the collimator objective lens and of the sample. Image processing system can calculate the dimensions and focal length of the division line.

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