Collimation Technique for Infrared Beam Based on Moire Fringe
A method of infrared beam collimation adjustment based on the Moire fringe is proposed based on the Talbot image of the grating and its relationship to beam collimation under spherical wave illumination.When the grating is moving,the change in the Moire fringe direction is observed and measured by an infrared array charge-coupled device(CCD)to adjust the beam collimation.As a result,fast and convenient collimation of the infrared beam is realized.The results show that,when the grating moves,because the distance is the same,the optical path changes of 0-order and±1-order light waves differ.The fringe shows periodic vertical axis movement and periodic contrast change,but the fringe direction remains unchanged.The fringe movement and contrast change do not affect the collimation accuracy.This method overcomes the difficulty of an invisible infrared beam and achieves simpler,faster,and more convenient collimation correction than the traditional collimation method.
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