This paper mainly focuses on the cylindricity estimation based on the minimum zone cylinder (MZC) method in three-dimensional Cartesian coordinate system. A simple search method is proposed by projecting coaxial cylinders vertically into X-Y plane to generate two concentric circles, and then the job of cylindricity error estimation is transformed into roundness error estimation to solve minimum zone circle (MZCI) model solution. A search circle model is employed to determine the two concentric circles of MZCI. To verify the performance of the proposed method, simulation experiments and comparison experiments are implemented. The results demonstrated that the proposed method is effective, reliable and meet the requirement of cylindricity estimation.
A method for optical generation and long-distance transmission of millimeter-wave signals is proposed in this paper. Two phase-dependent dual-wavelength laser beams are generated by a dual-wavelength laser. After long-distance transmission through the optical fiber, A beat signal can be generated. In this study, the frequency of signal can reach 24.640 GHz within 1km transmission distance. Although the beat signals above 30 GHz cannot be observed due to equipment limitations, an uncomplicated method has been shown in generating and long-distance transmission of millimeter-wave signals. Also, the method has its unique advantages of avoiding interference and electromagnetic pollution.
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