An optimization design method based on the combination topology optimization and DOE experimental design is proposed. The relationship among weight, stiffness and deformation of key components of the balanced main bearing structure is continuously optimized by comprehensive optimization method. Through a large number of examples to complete the search for the optimal solution, and then to achieve the main bearing structure stiffness, stability and weight optimal solution design. The design results show that the optimization design method based on the combination of topology optimization and DOE experimental design can greatly improve the design efficiency and completion quantity. The specific product designed by this method has been applied to the main bearing structure of an optical remote sensor. The bearing structure size reaches 3m, the load capacity is 700kg, and the weight is less than 110kg, which has good stability. This design method can be extended to other large size, small weight requirements and high stability structural parts design process, and has to wider application prospect.
Laser altimeter is the key configuration to improve the accuracy of the mapping satellite, the position accuracy of the laser spot emitted by the laser transmitter and the pointing accuracy of the laser beam received by the laser receiver will directly affect the plane and elevation positioning accuracy of the mapping satellite. Because the change of the spot position of the reference beam and the measurement beam can be calculated, the direction measurement of the laser altimeter can be realized. According to the need of quantitative measurement of the laser altimeter emitting and receiving spot direction, an optical system of direction measurement is designed in this paper. The technical indicators: The optical system focal length is 396mm, F number is 4.5, field of view is 2°× 2°,the operating wave band are 532nm±5nm,660±5nm,880±5nm. The encircled energy of the 532nm±5nm in 3×3 pixel is above 92% all over the field of view, the encircled energy of the 660nm±5nm in 3×3 pixel is above 90% all over the field of view, the encircled energy of the 880nm±5nm in 3×3 pixel is above 89% all over the field of view. The absolute distortion of the optical system is less than 1μm,the non-parallel degree of the chief ray in the whole field of view of the optical system is less than 0.015° . At present, considering the calibration error, the centroid extraction error, the optical component thermal deformation error and the laser jitter error, it can be calculated by the error synthesis theory that the pointing accuracy of the laser altimeter directional measurement optical system is about 0.36″.
According to the application requirements of the sub-second dynamic star simulator optical system, the main parameters of the star simulator optical system are studied and the basis for determining the parameters is given. Through the analysis of the optical system configuration characteristics, the transmission optical system was selected. Through the analysis of practical application, the design route of the object quasi-telecentric optical system with long focal length, small distortion and small centroid position deviation is determined. Based on the key points of design, the design idea of dynamic star simulator optical system is given. An example of the design was given, the technical indicators: the optical system focal length is 600mm, exit pupil diameter is 70mm, exit pupil distance is 70mm, field of view is7.1°, the operating wave band is 500~800nm, the modulation transfer function is above 0.30 all over the field of view at the Nyquist frequency of 36lp/mm, the absolute distortion value is less than 0.23μm all over the field of view. The design results show that the single star position deviation caused by the optical system is only 0.46″. This paper can provide a reference for the design of sub-second star simulator optical system.
According to the need of high resolution and VIS/IR composite image, the task requirements and the necessity of spectrum selection were given. based on the analysis of the imaging mode, the design route of VIS/IR composite imaging using off-axis linear field of optical system is determined. According to the aberration auto-balance optimization of optical design software, the two channel aberrations were initially balanced. The aspheric surfaces were introduced to correct residual aberration, and the compact requirement of the composite optical system is realized. An example of the design was given, The technical indicators: The VIS channel optical system focal length is 7800mm,F number is 11.73,field of view is 2.2°×0.2°,the operating wave band is 400~900nm, the modulation transfer function of the pan-spectral is above 0.30 all over the field of view at the Nyquist frequency of 71.4lp/mm, the modulation transfer function of the multi-spectral is above 0.80 all over the field of view at the Nyquist frequency of 18lp/mm. The IR channel optical system focal length is 2500mm,F number is 3.76,field of view is 3°×0.2°,the operating wave band is 3~5μm, the modulation transfer function of the system is above 0.32 all over the field of view at the Nyquist frequency of 33lp/mm. The system can achieved the resolution 0.45m/3m at 500km orbital altitude.
As to the need of low distortion MWIR optical system with high resolution and large width, the initial structure of the coaxial two-mirror and the relay optical system were calculated based on the aberration theory and Gauss’s optical imaging formula. According to the aberration auto-balance optimization of optical design software, the aspheric surface is introduced to correct residual aberration, and the compact requirement of infrared optical system was realized. Focal length 2000mm, F number 3, field of view 3°×0.5°, the operating wave band 3~5μm and 100% cold shied efficiency reached. High imaging quality was realized. The modulation transfer function of the system exceed 0.34 all over the field of view at the Nyquist frequency of 33lp/mm, and the relative distortion below 0.1%.The results of the design revealed the target depth that can be realized by the coaxial two-mirror system and relay optical system. The system can achieved a resolution 3.75m and a width of 26km.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.