Study On Optimal Design Of Aspheric Telecentric System Based On ZEMAX

With the development of processing technology,the corresponding measurement technology is also improved.Today,the on-line measurement technique is a must in the industry,and the machine vision technology that supports the on-line measurement technique has also been developed.It is widely used in automated production lines.The goal of pursuing higher precision requires a better system platform,and its key part-optical system affects the measurement precision of machine vision.Telecentric optical system is an important component of machine vision system,which is used in the field of precision measurement.The imaging quality of the telecentric optical system often determines the measurement accuracy of the measuring platform.At present,the optical system is complex,bulky and heavy.With the gradual maturity of aspheric processing technology,some researchers have started to introduce aspheric surface in the telecentric optical system to seek a simpler structure.However,some exquisite aspheric optical designs are only supported by the imaging theory,and they are often difficult to achieve mass production in production,which rejects the further development of the telecentric optical system.In this paper,the problem of optimization of aspheric surface will be analyzed.From the aspect of aspheric surface processing,optimize the optical system and improve the performance of the telecentric optical system.In the design process,the difficulty of processing is considered in order to obtain the optical system with small volume,high performance and low processing difficulty.The following contents are mainly studied.1.The optical path principle o f the telecentric optical system is analyzed,and the causes of aberration are analyzed based on the aberration theory.The aberration of simple optical structure is analyzed,and the optimization method of the optical technology is summarized.And the method of adding variables is selected from the simple spherical system to optimize the aberration.2.Aberration analysis of optical system.The imaging quality of optical system is affected by aberration correction,and the existing spherical optical system aberration is analyzed and studied,and the causes and correction methods of aberration are analyzed.In addition,the aberration theory of aspheric optics is studied,and the advantage of aberration is obtained by comparative analysis.3.Aspheric design and aberration correction research.According to the theory of aspheric surface,the feasibility of aspheric surface correction is analyzed.At the same time,This paper analyzes the machining properties of aspheric surface,considers the factors of machining,present the optimization method based on aspheric processing,and selects the combination elements of plane and aspheric surface to optimize.,to make optical system small size,good optical performance and low processing difficulty.4.In combination with the needs of industrial production,a telecentric optical system with magnification ratio of 0.12 X was designed,whose resolution was MTF >0.4 at 114lp/mm,and the total distortion was less than 0.1%..At the same time,the feasibility of the aspheric optimization method is verified.The research of this paper can be applied to the aspheric optimization of the telecentric optical system,to improve the image quality of the whole system,and to provide the theoretical basis for the design and production of the high image quality telecentric optical system.