High-precision rolling angle measurement for a three-dimensional collimator

Gao, Yang; Wang, Xingshu; Huang, Zongsheng; Zhan, Dejun; Hu, Chunsheng

doi:10.1364/ao.53.006629

Cited by 11 publications

(2 citation statements)

References 10 publications

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“…A multiple pinhole mask is mounted on the focal plane of the collimator, and the light passing through the holes passes through the optical system of the collimator, which becomes a multi-beams parallel light. According to the position coordinates of the hole and the focal length of the collimator, the propagation angle of each parallel light can be accurately obtained [18]. The schematics of a multiple pinhole collimator are shown in Fig.…”

Section: Camera Calibration With Multiple Pinhole Collimator a Scheme Of The Multiple Pinhole Collimatormentioning

confidence: 99%

Practical Calibration Method for Aerial Mapping Camera Based on Multiple Pinhole Collimator

et al. 2020

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Calibration of aerial mapping camera has an important influence on the applications of earth observation. However, the traditional aerial mapping cameras calibrations depend on large-scale calibration target or collimated light, moreover, it is difficult to build the large-scale calibration targets and the collimated light method requires an accurate turntable and a high-precision goniometer, which is a kind of expensive instrument. To solve this problem, this paper proposes a novel high-precision calibration method which is not restricted by the rigorous conditions, such as small aperture, unevenly energy distribution and expensive equipment. Specifically, a collimator and an elaborately designed multiple pinhole mask are firstly used to generate the collimated light of a large aperture with known directions to simulate the calibration targets at infinity. Then, the camera takes pictures for the aperture of the multiple pinhole collimator at multiple angles to ensure that the image points cover the entire detector. Thirdly, the final calibrated results are obtained by solving the data acquired from multiple angles. Finally, the proposed method is verified by Monte-Carlo simulation and real experimental data, whose results indicate that our method can reach the same accuracy performance as the existing methods at lower cost and faster speed, and thus is practical for engineering application.INDEX TERMS Aerial mapping camera, calibration, collimator, multiple pinhole mask.

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Section: Camera Calibration With Multiple Pinhole Collimator a Scheme Of The Multiple Pinhole Collimatormentioning

confidence: 99%

Practical Calibration Method for Aerial Mapping Camera Based on Multiple Pinhole Collimator

et al. 2020

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“…In one class, some of the methods use the optical measurement. Using collimating lenses or camera arrays, the hull deformations can be measured accurately and reliably [6]- [8]. But these methods use the instruments which require an inter-vision environment.…”

Section: Introductionmentioning

confidence: 99%

Hull Deformation Measurement With Large Angles Based on Inertial Sensors

Ding

Yao

2020

IEEE Access

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The partial reference is used in large ships to measure the hull deformation, which is normally realized through the transfer alignment between the master inertial navigation system and the slave inertial navigation system. In recent years, the matching methods based on several inertial measurement units has become the development trend to avoid the initial alignment of the slave system. However, these methods always require that the deformation angle is small and the system model can be regarded as a linear model. The purpose of this paper is to solve the large deformation problem through coarse estimation based on the optimized attitude determination and propose an improved transfer alignment method based on the attitude matching in the inertial frame. The coarse estimation does not rely on the deformation model and can decrease the deformation error to a small angle in a short time. Then the system model and the measurement model are built to carry out the attitude matching in the inertial frame, which is stable and can avoid initial alignment. The swing table test show that the proposed method can estimate the large deformation between the two IMUs rapidly and precisely.

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Three-degree-of-freedom autocollimation angle measurement method based on crosshair displacement and rotation

Yan

Cheng

Liu

2023

Review of Scientific Instruments

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The classic autocollimation method manages to measure the two-degree-of-freedom (2-DOF) angles, namely pitch and yaw, but fails to measure the roll angle. This paper proposes an autocollimation method that enables the simultaneous measurement of 3-DOF angles in which a carefully designed cooperated reflector (CR) splits the collimated beam into two returning beams parallel to the optical axis. The 3-DOF angles of the CR can be obtained by detecting the displacement and rotation of the crosshair images received by two photodetectors. The measurement principle is dissected, and the experimental results reveal that the constructed system achieves an accuracy of better than ±1.54 arcsec in the range of ±1000 arcsec. In addition, it is demonstrated that the system can be applied to the 3-DOF angle measurement of long-distance targets.

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High-precision rolling angle measurement for a three-dimensional collimator

Cited by 11 publications

References 10 publications

Practical Calibration Method for Aerial Mapping Camera Based on Multiple Pinhole Collimator

Practical Calibration Method for Aerial Mapping Camera Based on Multiple Pinhole Collimator

Hull Deformation Measurement With Large Angles Based on Inertial Sensors

Three-degree-of-freedom autocollimation angle measurement method based on crosshair displacement and rotation

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