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Optimization of the phase mask is one of the key tasks in the design of wavefront coding systems for depth of field extension. Instead of optimization of the phase mask for ideal optical systems, which was the focus of the previous research, this paper proposes an integrative optimization method for practical optical systems considering the various optical aberrations. A practical wavefront coding system based on a doublet is designed using the integrative optimization method, while an ideal system with an optimized phase mask is also used for comparison. The simulation results show that the practical wavefront coding system designed by the integrative optimization method works well on both the on-axis and off-axis fields, while the ideal system with the optimized phase mask had a poor performance on the off-axis fields. Off-axis fields should also be considered as well as on-axis field in the design of practical optical systems, therefore the integrative optimization method will be significant for the design of practical wavefront coding systems.

For recent years, with the development of manufacture, free-form surfaces are widely used in optical systems because of the degrees of freedom and the capacity of correcting optical aberrations. Nowadays, commercial optical design software such as Optics Studio are commonly applied to optimize an optical system from a suitable initial structure to obtain high-quality imaging characteristics. The initial structure optimized by software must include the surface types and its parameters. Notice that the free-form surface type is unknown, let alone the parameters. Therefore, the initial structure of a free-form surface cannot be designed by commercial optical design software directly. The software cannot optimize or analyze the system with free-form surfaces either. This paper proposed an integral design method of optical system with free-form surfaces based on theoretical calculation and optimization of optical design software. Firstly, Fermat’s principle, equal optical path length between object and image, is applied to calculate the sampling data points of the free-form surface. Data points are fitted using least-square fitting algorithm to obtain a the surface type and its parameters, which are used as the initial structure. Secondly, a commercial optical design software further optimize the optical system containing the free-form surface. Not only the free-form surface but also other parameters can be optimized by the software. With the powerful functions of image quality and tolerance analysis of the software, we can obtain a high-quality imaging system with free-form surfaces in a short time. This method solves the problem that commercial software cannot design optical systems with free-form surfaces directly. Meanwhile initial structure with free-form surface can be acquired directly by this method. In addition,the powerful functions of the software such as optimization, image quality and tolerance analysis are fully utilized in the process of integral optimization. Since the system will be further optimized by the software, a small amount of sampling data points is enough to calculate the initial structure which speeds up the calculation. A passive ranging and three-dimensional imaging system with chiral phase mask is designed as an example. Different from conventional imaging system, two image points will be obtained by the system when one point is used as the object. Apparently, it is difficult for any commercial optical design software to design. The novel integral method proposed in this paper is applied to this system.Firstly, the system is designed in reverse sequence for the sake of simplification. A doublet with effective focal length 200mm and f-number 8 is used as the initial structure. Two points at (0,0.3,256.1) and (0,-0.3,256.1) are used as Please verify that (1) all pages are present, (2) all figures are correct, (3) all fonts and special characters are correct, and (4) all text and figures fit within the red margin lines shown on this review document. Complete formatting information is available at http://SPIE.org/manuscripts Return to the Manage Active Submissions page at http://spie.org/submissions/tasks.aspx and approve or disapprove this submission. Your manuscript will not be published without this approval. Please contact author_help@spie.org with any questions or concerns. the “object” which will image at (0,0,-63.6) as the “image” in the reverse sequence. A free-form surface is added in front of the doublet, thus the whole system turns to a triplet system. 6X12 sampling data points are calculated to fit an XY polynomial surface. Secondly a commercial optical design software further optimizes the optical system with the free-form surface. Finally, we obtain a high-quality imaging system with a free-form surface. The MTF (Modulation Transfer Function) performance of the system is closed to diffraction limit.

For the limitations of the relay iron core in the process of production and detection still use manual measurement in electrical industry, a dynamic measurement system is designed. Meanwhile, a set of transmission system is designed to achieve dynamic measurement. This transmission system can solve the limitations of factories using offline measurement, which is easy to implement, easy to operate, easy to popularize. What’s more, it is with high working efficiency and high economic efficiency.

A new flatness error measurement method was proposed for large quantities of E-type AC relay, which was consisted of three discontinuous plane. The research object of this thesis is on both sides of the work piece plane. The relay was measured by utilizing multiple laser displacement sensors, and used the development of PC software to extract the measurement key points and process the collected data, which was used the method of least squares to calculate more accurate flatness error value. This method can achieve substandard work-piece fast sorting and rapid online measure.

This paper introduces the importance of the bolster spring in railroad traffic safety, and the present situation of detection about the free length of the bolster spring has been reviewed. For overcoming the shortcomings of the detection in accuracy and efficiency, a new method is proposed to detect and sort the free length of different specifications of bolster springs fast and high-precision,which based on laser scanning ranging principles and PC software programming. It will highly enhanced the detection precision and the accuracy of material selection.