Assembly Error Analysis and In-orbit Verification of Grazing Incidence Focusing X-ray Pulsar Telescope

doi:10.3901/JME.2018.11.049

Abstract

Abstract: Aiming at the issue of optical performance of grazing incidence focusing X-ray pulsar telescope affected by multi-source assembly errors, an assembly error analysis method of spatial X-ray focusing optical product is proposed. Considering the assembly error such as eccentricity, inclination, defocusing and surface distortion caused by assembly stress, the theoretical analysis model of product assembly error is constructed based on the small displacement torsor theory and spatial position and posture transformation matrix. The influence of assembly error on focusing performance was quantitatively analyzed by optical vector calculation and Monte Carlo method. Tilt error has the greatest impact on focusing performance, in which the tilt error 1' can cause the focal spot RMS to increase by about 0.3-0.4 mm. The allowable tilt error limits for the 0', 3.75' and 6' field of views are 5.31', 3.14' and 1.38' respectively. Whereas, eccentricity error and defocus error are less affected, the permissible error limit for the field of view 0-6 is approximately 0.45-0.50 mm and the defocus error can be relaxed to ±5 mm. The maximum profile error of assembly stress and self weight is about 101nm and RMS is 14.17 nm. The profile error of 6-7' field of view has the greatest effect on focal spot (about 9.46%). An assembly adjustment system with multi-degree-of-freedom adjustment and image processing algorithm is formulated to realize the precision assembly of 0.78 mm of focal spot RMS. The results of assembly test and in-orbit telemetry data verify the effectiveness of assembly error theory analysis and precision assembly method. The proposed method has guiding significance for the precision assembly of space X-ray focusing telescope.

Key words: assembly error analysis, focusing X-ray telescope, in-orbit verification, spatial position and attitude transformation matrix

CLC Number:

TH122
O213

LI Liansheng, MEI Zhiwu, DENG Loulou, LÜ Zhengxin, LIU Jihong, SUN Jianbo, SUN Yan, ZHOU Hao, ZUO Fuchang. Assembly Error Analysis and In-orbit Verification of Grazing Incidence Focusing X-ray Pulsar Telescope[J]. Journal of Mechanical Engineering, 2018, 54(11): 49-60.

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