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. 2019 Feb 26;19(5):990.
doi: 10.3390/s19050990.

Thermal Stability Optimization of the Luojia 1-01 Nighttime Light Remote-Sensing Camera's Principal Distance

Kun Zhang  1   2   3 , Xing Zhong  4   5   6 , Guo Zhang  7 , Deren Li  8 , Zhiqiang Su  9 , Yao Meng  10 , Yonghua Jiang  11
Affiliations

Thermal Stability Optimization of the Luojia 1-01 Nighttime Light Remote-Sensing Camera's Principal Distance

Kun Zhang et al. Sensors (Basel). .

Abstract

The instability of the principal distance of the nighttime light remote-sensing camera of the Luojia 1-01 satellite directly affects the geometric accuracy of images, consequently affecting the results of analysis of nighttime light remote-sensing data. Based on the theory of optical passive athermal design, a mathematical model of optical-passive athermal design for principal distance stabilization is established. Positive and negative lenses of different materials and the mechanical structures of different materials are matched to optimize the optical system. According to the index requirements of the Luojia 1-01 camera, an image-telecentric optical system was designed under the guidance of the established mathematical model. In the temperature range of -20 °C to +60 °C, the principal distance of the system changes from -0.01 μm to +0.28 μm. After on-orbit testing, the geometric accuracy of the designed nighttime light remote-sensing camera is better than 0.20 pixels and less than index requirement of 0.3 pixels, which indicating that the principal distance maintains good stability on-orbit and meets the application requirements of nighttime light remote sensing.

Keywords: Luojia 1-01; nighttime light remote-sensing camera; optical-passive athermal design; principal distance; thermal stability.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Luojia 1-01 satellite.
Figure 2
Figure 2
The structure of the optical system.
Figure 3
Figure 3
Nighttime light remote-sensing camera of Luojia 1-01.
Figure 4
Figure 4
Lateral color of the optical system.
Figure 5
Figure 5
Field curve and distortion of the optical system.
Figure 6
Figure 6
Modulation transfer function of the optical system.
Figure 7
Figure 7
Nighttime light remote-sensing image.
Figure 8
Figure 8
Variation of principal distance with temperature.
Figure 9
Figure 9
Variation of back focal length with temperature.
Figure 10
Figure 10
Graphs of modulation transfer function. (a) −20 °C; (b) 20 °C; (c) 60 °C.
Figure 11
Figure 11
Variation of principal distance with temperature.
Figure 12
Figure 12
Curve of absolute distortion variation with temperature.
See this image and copyright information in PMC

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