In order to enlarge the effective field, field correctors were introduced into the R-C system. In this paper, discussed the
relationship among the field corrector, focal ratio of the primary mirror and the vertex back focus. Five sets of correctors
were designed for various Fp of the primary mirror of the RC systems: Fp/1.1, Fp/1.5, Fp/1.8, Fp/2, and Fp/2.5. The
results indicate that the decrease of the focal ratio of the primary increases the difficulty of the field correctors' design.
A simple, flexible and real-time calibration method is proposed to solve the calibrating problems of line structure light sensor such as requirement of high accurate calibration model, complicated calibrating procedure and so on. First, a 2D calibration plane with tessellated pattern is placed at several arbitrary places in the measurement range of sensor, and the pictures of calibration board on these positions are recoded. The parameters of camera are estimated from these pictures. Secondly, the line structure light is turned on, and projected on the surface of calibration board. Several pictures are captured while the board is being moved along the direction of line structure light. Thirdly, the rotating matrixes and transform vectors between the local coordinates of these planes and the global coordinate of sensor are estimated. The global coordinates of the control points falling on the line structure light plane were calculated according to these matrixes and vectors. Finally, the model parameters of the sensor at working state are optimized with these control points. The cost of calibration equipment is greatly reduced and the calibrating procedure is simplified with the proposed approach. So it can promote the engineering applications of the line structure light sensor. It shows that this method is practical for surface measurement. The height error (RMS) of the measured object reaches 0.03mm in the region of 200mm x 150mm.
The numerical analysis method for the surface deformation of rotating mirrors were presented based on the
three-dimensional elastic mechanics and the computational techniques of finite element in this manuscript. With this
method, the surface deformation curves of rotating mirrors including multi-surfaces from three to eight, aluminous, steel,
and beryllium ones were calculated. A result was obtained that surface patterns of a mirror in operation are primarily
dependent on the amount of surfaces and the axial hole which whether or not exists for aluminous and steel mirrors, but
it rests with the amount of surfaces as well as Poisson's ratio for a beryllium mirror with so tiny Poisson's ratio. This
conclusion is different from that of forerunner.
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