Analysis and suppression of space stray light of visible cameras with wide field of view

Xing, 陈 醒 Chen; Chun-hui, 胡春晖 Hu; Chang-xiang, 颜昌翔 Yan; De-cheng, 孔德成 Kong

doi:10.3788/co.20191203.0678

Cited by 8 publications

(6 citation statements)

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“…( 5), BSDF is the surface bidirectional scattering distribution function, GCF the geometric factor, and s d the emitting surface radiation flux. It can be seen that it is necessary to reduce the radiation flux c d of the receiving surface c dA in order to suppress stray light, which can be achieved in the following three ways [28]- [30]:…”

Section: B Analysis Of the Surface Radiation Energy Transfer Modelmentioning

confidence: 99%

Study on Stray Light Testing and Suppression Techniques for Large-Field of View Multispectral Space Optical Systems

Lu,

Xu,

Zhang

et al. 2024

IEEE Access

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To evaluate the ability of space optical systems to suppress off-axis stray light, this paper proposes a stray light testing method for large-field of view, multispectral spatial optical systems based on point source transmittance (PST). And a stray light testing platform was developed using a high-brightness simulated light source, large-aperture off-axis reflective collimator, high-precision positioning mechanism and a double column tank to evaluate the stray light PST index of spatial optical system. On the basis of theoretical analyses, a set of calibration lenses and stray light elimination structures such as hoods, baffle and stop are designed for the accuracy calibration of stray light testing systems. The theoretical PST values of the calibration lens at different off-axis angles are analyzed by Trace Pro software simulation and compared with the measured values to calibrate the accuracy of the system. The testing results show that the PST measurement range of the system reaches 10 -3 ~10 -10 when the off-axis angles of the calibration lens are in the range of ±5°±60°. The stray light test system has the advantages of wide working band, high automation and large dynamic range, and its test results can be used in the correction of lens hood and other applications.INDEX TERMS Multi-spectrum, large-field view, stray light, point source transmittance (PST), lens hood

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Section: B Analysis Of the Surface Radiation Energy Transfer Modelmentioning

confidence: 99%

Study on Stray Light Testing and Suppression Techniques for Large-Field of View Multispectral Space Optical Systems

Lu,

Xu,

Zhang

et al. 2024

IEEE Access

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“…The blocking ring usually takes the form of a black coating with a high absorption rate. The hood structure [29], when combined with a cylindrical outer wall and a conical inner wall, can effectively reduce the number of blocking rings required and increase the depth of these blocking rings, and it is thus highly conducive to the elimination of stray light; therefore, the structure shown in Figure 6 was used for the design of the blocking rings.…”

Section: Design Of the Anti-stray Light Structurementioning

confidence: 99%

“…structure [29], when combined with a cylindrical outer wall and a conical inner wall, can effectively reduce the number of blocking rings required and increase the depth of these blocking rings, and it is thus highly conducive to the elimination of stray light; therefore, the structure shown in Figure 6 was used for the design of the blocking rings. Connecting the upper vertex 𝐵 of the external hood and the upper inner wall 𝐵 of the cone gives the first stop ring position; 𝐴 at the main mirror of the lower inner wall of the cone is then connected with 𝐵 at the edge of the external hood, and the intersection of this line with the upper inner wall of the cone at point 𝐵 is the second stop ring position.…”

Section: Design Of the Anti-stray Light Structurementioning

confidence: 99%

Stray Light Analysis and Suppression for an Infrared Fourier Imaging Spectrometer

Ben,

Shen,

et al. 2024

Photonics

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To improve the accuracy of infrared radiation characteristics measurement in the aviation field, an infrared Fourier transform imaging spectrometer based on a double-swing solid angle reflector was designed. This imaging spectrometer operates in the 3–5 μm wavelength range and has a field of view of 1.7° × 1.7°. This article presents a comprehensive analysis of the system’s stray light and also studies the impact of external stray light on the imaging quality, along with the influence of internal stray light on the interference effects and the spectral resolution. It also present the design of a hood that suppresses the point source transmittance of the external stray light down to the order of 10−4. Based on this, we propose a method that incorporates the introduction of wedge and inclination angles. Additionally, a numerical range is provided for the addition of these angles on the beam splitter mirror and compensation plate. This ensures the effective suppression of any internal stray light. This study fills the gap in the knowledge about Fourier transform imaging spectrometers operating in the mid-infrared band for aviation applications, and proposes a suppression method suitable for interference systems, which is also suitable for Fourier transform imaging spectrometers based on other types of interferometers. This study broadens the application field of Fourier transform imaging spectrometers in stray light, and has great significance to promote the development of Fourier transform imaging spectrometer.

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“…Through the analysis of the entire stray light transmission process, reducing the GCF of the stray light energy transmitted at each stage (increasing the design of the baffle, vanes and diaphragm) is the most direct and effective method to suppress the stray light from reaching the detector 15 .…”

Section: Stray Light Suppression Mechanismmentioning

confidence: 99%

Design of three-class ultra-efficient stray light suppression baffle

Jin

Lin²,

Wang³

et al. 2023

International Conference on Precision Instruments and Optical Engineering (PIOE 2022)

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The ultra-efficient standard light baffle plays an important role in the calibration of the stray light test system. In this paper, a three-class baffle is designed. And a design scheme of the baffle with honeycombed wall is proposed, by analyzing the stray light transmission model and suppression mechanism, which can meet the requirements of a baffle with ultra-efficient stray light suppression capability. A simulation model of the baffle was established. The simulation of baffle show that when the stray light suppression angle is greater than 8°, the PST value of the baffle reaches 10 -6 magnitude. When the stray light suppression angle is greater than 17°, the PST value of the baffle reaches 10 -12 magnitude, which can meet the needs of ultra-efficient calibration of laboratory stray light test systems.

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Analysis and suppression of space stray light of visible cameras with wide field of view

Cited by 8 publications

References 0 publications

Study on Stray Light Testing and Suppression Techniques for Large-Field of View Multispectral Space Optical Systems

Study on Stray Light Testing and Suppression Techniques for Large-Field of View Multispectral Space Optical Systems

Stray Light Analysis and Suppression for an Infrared Fourier Imaging Spectrometer

Design of three-class ultra-efficient stray light suppression baffle

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