Optimized Design of Integrated Ultra-Light Main Supporting Structure for Micro-Nano Remote-Sensing Camera

Table 1. Tolerance of optical system
View table
Table 1. Tolerance of optical system
Mirror Rigid displacement Twist angle
Δx /μm Δy /μm Δz /μm θ_x /(″) θ_y /(″) θ_z /(″)
Primary mirror Datum Datum Datum Datum Datum Datum
Second mirror 20 20 None 20 20 None

Table 2. Physical properties of main supporting structure materials of common space cameras

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Table 2. Physical properties of main supporting structure materials of common space cameras

Material	Density ρ /(g·cm^-3)	Young's modulus E /GPa	Specific stiffness	Thermal conductivity k /(W·m^-1·℃^-1)	Thermal expansion coefficient α /(10^-6 ℃^-1)	Poisson's ratio μ
M40	1.56	145	92.9	2	-2	0.3
Invar	8.1	141	17.4	13.9	0.05-7.5	0.25
SiC	3.05	330	108.2	185	2.5	0.2
ZTC4	4.44	114	25.7	8.8	8.9	0.29

Table 3. Comparison of performance parameters of main supporting structures
View table
Table 3. Comparison of performance parameters of main supporting structures
Structure type Power of high temperature /W Power of low temperature /W Peak power /W Mass /kg
Cylinder type 2.1 5.4 14 >1
Truss type 0.6 1.6 4 <1

Table 4. Sizes of main supporting structure
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Table 4. Sizes of main supporting structure
Designvariable Variationrange /mm Optimizationvalue /mm Design value /mm
T_top [1,3] 2.2 2
T_cj [1,3] 1.6 2
T_rod [2,6] 4.0 4
T_board [5,12] 10.8 10
T_trim [2,4] 3.3 3
T_bot [6,10] 5.5 6

Table 5. Structures and parameters of micro-nano remote-sensing camera and NAOMI camera
View table
Table 5. Structures and parameters of micro-nano remote-sensing camera and NAOMI camera
Item Micro-nano remote-sensing camera NAOMI camera
Structure
Mass /kg 6 13
Dimension ϕ230 mm×480 mm 340 mm×460 mm×510 mm
Orbit altitude /km 500 680
Ground sample distance /m 2 2.5
Swath width /m 10 17.5

Table 6. Results of statics analysis
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Table 6. Results of statics analysis
Mirror Rigid displacement Twist angle
Δx /μm Δy /μm Δz /μm θ_x /(″) θ_y /(″) θ_z /(″)
Primary mirror Datum Datum Datum Datum Datum Datum
Second mirror 4.3 0.0003 None 6.5 0.003 None

Table 7. Comparison of intrinsic frequencies obtained from sine-frequency sweep experiment and engineering analysis
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Table 7. Comparison of intrinsic frequencies obtained from sine-frequency sweep experiment and engineering analysis
Loading direction Intrinsic frequency from analysis /Hz Intrinsic frequency from experiment /Hz Error /%
Horizontal 199 200 0.5
Axial 419 423 1.0

Table 8. Comparison between statics test results and analysis data
View table
Table 8. Comparison between statics test results and analysis data
Angle of pitch Optical tolerance /(″) Data of analysis /(″) Data of test /(″) Error /%
θ_x 20 6.5 5.4 16

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Tailei Wang, Lei Zhang, Xuezhi Jia, Ge Gao. Optimized Design of Integrated Ultra-Light Main Supporting Structure for Micro-Nano Remote-Sensing Camera[J]. Acta Optica Sinica, 2019, 39(7): 0728009

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Paper Information

Category: Remote Sensing and Sensors

Received: Jan. 4, 2019

Accepted: Apr. 1, 2019

Published Online: Jul. 16, 2019

The Author Email: Jia Xuezhi (xuezhi0817@163.com)

DOI:10.3788/AOS201939.0728009

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Tolerance of optical system

Table 1. Tolerance of optical system

Table 2. Physical properties of main supporting structure materials of common space cameras

Table 2. Physical properties of main supporting structure materials of common space cameras

Table 3. Comparison of performance parameters of main supporting structures

Table 3. Comparison of performance parameters of main supporting structures

Table 4. Sizes of main supporting structure

Table 4. Sizes of main supporting structure

Table 5. Structures and parameters of micro-nano remote-sensing camera and NAOMI camera

Table 5. Structures and parameters of micro-nano remote-sensing camera and NAOMI camera

Table 6. Results of statics analysis

Table 6. Results of statics analysis

Table 7. Comparison of intrinsic frequencies obtained from sine-frequency sweep experiment and engineering analysis

Table 7. Comparison of intrinsic frequencies obtained from sine-frequency sweep experiment and engineering analysis

Table 8. Comparison between statics test results and analysis data

Table 8. Comparison between statics test results and analysis data