Moiré deflectometry is used for the measurement of focal lengths of optical lenses in this paper. Detailed uncertainty
analysis is done, and achievable accuracy is discussed. To increase the measurement accuracy, we propose two useful
ways by changing the two systemic parameters (angle and space between two gratings). Firstly, we find that the space
between two gratings affect the error from the tilt angle of moiré fringe greatly. And optimum space between two
gratings for minimum error is referred to. In the other hand, enhancing the angle between the two grating's ruling's lines
moderately can reduce error from the angle of two gratings greatly. Theoretical analysis and experimental results
indicate that, higher measurement accuracy can be achieved by changing the systemic parameters opportunely.
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