Stray Light Analysis and Elimination of an Optical System Based on the Structural Optimization Design of an Airborne Camera

Li, Jinliang; Yang, Yang; Qü, Xia; Jiang, Chenpin

doi:10.3390/app12041935

Cited by 9 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the characteristics of infrared imaging spectrometers and the analysis method used for stray light in traditional optical systems, the following potential sources of stray light were determined [24]: (1) Stray light can be caused by light originating outside the system's field of view entering the optical system, which mainly comes from direct irradiation by sunlight, surface radiation, and atmospheric scattering. The stray light is formed after it reaches the image plane through the optical system, and this light is generally present in various imaging systems.…”

Section: Sources Of Stray Lightmentioning

confidence: 99%

Stray Light Analysis and Suppression for an Infrared Fourier Imaging Spectrometer

Ben,

Shen,

et al. 2024

Photonics

View full text Add to dashboard Cite

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.

show abstract

Section: Sources Of Stray Lightmentioning

confidence: 99%

Stray Light Analysis and Suppression for an Infrared Fourier Imaging Spectrometer

Ben,

Shen,

et al. 2024

Photonics

View full text Add to dashboard Cite

show abstract

“…The transmission of stray light on any two surfaces conforms to the radiation transfer theory [27], the principle of which is shown in Figure 3. According to the radiative transfer theory, between two media surfaces, light energy propagates as follows [28]:…”

Section: Principles Of the Formation And Elimination Of Stray Light B...mentioning

confidence: 99%

Stray Light Nonuniform Background Elimination Method Based on Image Block Self-Adaptive Gray-Scale Morphology for Wide-Field Surveillance

Wang

2022

Applied Sciences

View full text Add to dashboard Cite

Space-based wide-field surveillance systems are of great significance in maintaining the security of space resources by avoiding collisions between space targets. However, their performance is hindered by stray light phenomena. The nonuniform background noise caused by stray light significantly hampers subsequent target detection, leading to a high frequency of false alarms. To solve this problem, we propose a robust and accurate nonuniform background elimination method based on image block self-adaptive gray-scale morphology (IBSGM). First, we define two kinds of structural operators with different sizes and domains, which make full use of the difference between the target pixels and surrounding background pixels. Then, we block the original surveillance image and find the size of the largest target in each block by the minimum bounding rectangle method to determine the optimal size of the structural operator suitable for each block. Finally, we perform morphological processing using the defined structural operators to eliminate nonuniform backgrounds from images. Experimental results on simulated and real image datasets demonstrate that the proposed IBSGM method has higher precision in eliminating the nonuniform background when compared to other methods.

show abstract

“…The PST method was put forward by Breault [13]- [15] in the 1970s, which was used to measure the stray light suppression ability corresponding to different off-axis angles. Henceforth, many institutions conducted research on the analysis and detection of stray light in optical systems using PST method.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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

show abstract

Stray Light Analysis and Elimination of an Optical System Based on the Structural Optimization Design of an Airborne Camera

Cited by 9 publications

References 24 publications

Stray Light Analysis and Suppression for an Infrared Fourier Imaging Spectrometer

Stray Light Analysis and Suppression for an Infrared Fourier Imaging Spectrometer

Stray Light Nonuniform Background Elimination Method Based on Image Block Self-Adaptive Gray-Scale Morphology for Wide-Field Surveillance

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

Contact Info

Product

Resources

About