The focal length is one of the important parameters in the optical element, and the high precision measurement of the focal length has become a key problem in the processing and use of the optical element. The laser differential confocal length measurement system is introduced, and the uncertainty of the two sets of focal length measurement is evaluated. The relative error (K = 2) is better than 4.77×10-5, and the relative error is 0.00025%.
In many long focal distance lens focal length detection method, laser confocal combined focal length measurement with
ultra high focusing accuracy, more and more attention and application. The accurate measurement of the distance
between the lens focus and the focus in the measurement process is the key to improve the accuracy of the whole
measurement. By repeating the measurement of focal distance under different environmental conditions, the results of
repeated measurements of influenced by the environmental conditions. The results show that air disturbance is the
measurement repeatability factors having the greatest impact, for better use of the equipment and in the equipment
development research foundation laid the foundation.
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