18 November 2013 High-accuracy magnification calibration for a microscope based on an improved discrete Fourier transform
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Microscopes are widely applied in characterizing feature sizes at the micro-/nanoscale, and magnification calibration plays a key role in achieving precise measurements. However, it is difficult to obtain accurate results by using the general magnification calibration method if comparing the displayed size of a test-piece under microscope and its original one. In this study, a high-accuracy and automatic magnification calibration method that could be applied to different types of microscopes is proposed. A standard grating is employed as the reference, and a high-resolution discrete Fourier transform is used to analyze the images captured under various magnifications in this method. With utilization of the high-order harmonic component in the Fourier spectrum, the proposed method is capable of performing the calibration over a wide range of magnifications while maintaining identical precision. The relative error of the proposed method can be theoretically limited to 0.01%; moreover, the image noise can be tolerated. Furthermore, the validation and extensive adaptability of this method are demonstrated by calibrating the magnification of a scanning electron microscope and an optical microscope.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xianglu Dai, Xianglu Dai, Huimin Xie, Huimin Xie, Chuanwei Li, Chuanwei Li, Zhu Wu, Zhu Wu, Hongxia Geng, Hongxia Geng, } "High-accuracy magnification calibration for a microscope based on an improved discrete Fourier transform," Optical Engineering 52(11), 114102 (18 November 2013). https://doi.org/10.1117/1.OE.52.11.114102 . Submission:

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