Impact of microvibration on the optical performance of an airborne camera

Lin, Jian; Zhang, Yan; Wang, Haitao; Gu, Yan; Gao, Minghui; Guo, Xin; Xu, Hao

doi:10.1364/ao.411299

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…3 that the RBD of each optical element and the optical sensitivity matrix are the keys to determining the accuracy and reliability in evaluating the LOS stability of the LCT. However, the traditional methods, which are used to calculate the RBD by the least squares and obtain the optical sensitivity by unit perturbation, 14 , 18 , 20 , 25 , 26 will lead to error accumulation and insufficient generalization. To address these issues, on the one hand, we propose an improved method to calculate the RBDs of the optical components by constructing Lagrange’s equation based on the dual quaternion.…”

Section: Integrated Modelingmentioning

confidence: 99%

Integrated modeling and analysis of the microvibration effects on the line-of-sight stability for the space laser communication terminal

Li,

Guo,

Qin

et al. 2024

Opt. Eng.

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Accurately assessing the microvibration effects on the line-of-sight (LOS) stability for the space laser communication terminal (LCT) is crucial for ensuring the long-term stability of communication links. To address this challenge, an integrated modeling approach is proposed to analyze the microvibration effects on the LOS stability for the space LCT. First, the LCT's finite-element model, consisting of the off-axis telescope antenna and the rear optical path, is built to extract the nodes' data of each surface on the optical element under the microvibration. Then the dual quaternion, which could avoid the solution error and insufficient generalization ability of the traditional least squares method, is used to calculate the surface's rigid body displacement on the optical element. Furthermore, combined with the LCT's optical sensitivity matrix obtained by the regression analysis method, the LOS jitter of the terminal is calculated to evaluate the LCT's stability and guide the structural optimization. Finally, a test is conducted to validate the reliability of the integrated modeling approach. Simulation and experimental results show that the method proposed can further improve the accuracy of analysis and guide the structural optimization of LCT.

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Section: Integrated Modelingmentioning

confidence: 99%

Integrated modeling and analysis of the microvibration effects on the line-of-sight stability for the space laser communication terminal

Li,

Guo,

Qin

et al. 2024

Opt. Eng.

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“…In the case where the displacement of optical element is only in the order of micrometers or microradians, it can be considered that the relationship between displacement of every optical element and optical system performance indicators is linear. The influence of every optical element on performance indicators is linearly superimposed, which promotes the macroscopic change in system indicators [17] . Therefore, the linear optical model can be represented as…”

Section: Influence Of Optical Elements On Los Jittermentioning

confidence: 99%

Opto-mechanical dynamics optimization of electro-optical stabilized sighting system based on data driving

Xu,

Wang,

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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Difference exists between modeling result of current electro-optical stabilized sighting system (EOSSS) and dynamics characteristics of actual structure. As a result, accurate description of optical performance of imaging system in vibration environment is relatively difficult, and then it seems complicated to improve anti-vibration characteristics efficiently through structure optimization. In order to solve these problems, a data-driven opto-mechanical dynamics optimization method is proposed in this paper. First, vibration mode and modal frequency of opto-mechanical structure are obtained through hammer hitting test and vibrator-exciting experiment. Oriented towards consistency of structural mode parameters and measured data, finite element model of EOSSS structure is acquired by iteration. Then, relationship among optical system performance and displacement of every optical element is described through optical sensitivity matrix. Linear optical model of imaging system is built and contribution of different optical element to line-of-sight (LOS) jitter is analyzed. After structural optimization of core optical elements, LOS jitter of EOSSS under vibration condition is obtained. Experimental results indicate that modal parameter error between proposed structural model and measured data is only 3.55%. Structural optimization of system based on the proposed model makes the LOS jitter of EOSSS under vibration environment reduce by 82.8%. Description of intrinsic characteristics of EOSSS structure is accurate by data-driven opto-mechanical dynamics optimization method. Therefore, structural optimization makes LOS stabilization improve dramatically under vibration condition.

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“…The data obtained from finite element simulation include both linear displacement and angular displacement, which cannot be directly substituted into the mathematical model of pointing error Eq. ( 4), and the linear displacements does not affect the device's pointing accuracy, so it is necessary to use homogeneous coordinate transformation and the least squares method to separate linear displacement and angular displacement [29,30]. The separated angular displacement data are input into the established mathematical model of pointing errors mentioned above, which allows the calculation of pointing errors for any single unit.…”

Section: Data Analysis and Processingmentioning

confidence: 99%

Pointing accuracy of airborne multi-light source steering device

Zhang,

Hou

et al. 2024

IEICE Electron. Express

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To validate the performance of the optical system of the tested equipment, the airborne multi-light source steering device needs to track the mounted equipment on other aircraft during flight tests and provide it with five beacon lights with a maximum span of more than 2 meters and parallelism less than 0.3°. The design, calibration, and flight environment of the airborne multi-light source steering device can affect its pointing accuracy. To address this issue, this paper studies the pointing accuracy of the device, separates its errors, and proposes a method based on the combination of multi-body system theory and finite element simulation. By establishing a mathematical model of pointing errors and relying on finite element simulation to simulate real-world working conditions, the dynamic pointing error patterns are analyzed. Finally, the method is validated through experiments. In the ground dynamic tests, the device's pointing accuracy is 0.2099°, and during the flight tests, the pointing accuracy is 0.231° with an accuracy rate of 90.86%. This proves that the proposed method is highly reliable and accurate.

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Impact of microvibration on the optical performance of an airborne camera

Cited by 6 publications

References 16 publications

Integrated modeling and analysis of the microvibration effects on the line-of-sight stability for the space laser communication terminal

Integrated modeling and analysis of the microvibration effects on the line-of-sight stability for the space laser communication terminal

Opto-mechanical dynamics optimization of electro-optical stabilized sighting system based on data driving

Pointing accuracy of airborne multi-light source steering device

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