Design and characterization of a safe Shack–Hartmann type aberrometer for making in-vivo measurements: Heuristic approximation

Valdivieso-González, L. G.; Muñoz-Potosi, A.F.; Tepichín-Rodríguez, Eduardo

doi:10.1016/j.optcom.2019.124500

Cited by 3 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Shack-Hartmann wavefront sensor is one of the most widely used wavefront sensors because of its great energy utilization, fast real-time sensing, and strong anti-noise ability [1]. It is widely employed in the detection of human eye aberrations [2,3], astronomical observation [4,5], laser beam purification [6,7], optical element identification [8,9], and other fields. To enhance detection performance, researchers have modified the instrument structure to introduce more information and proposed slope and curvature hybrid sensors, which have significant research value.…”

Section: Introductionmentioning

confidence: 99%

Fast and Highly Accurate Zonal Wavefront Reconstruction from Multi-Directional Slope and Curvature Information Using Subregion Cancelation

Liu,

Zhong,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

The wavefront reconstruction is a crucial step in determining the performance of wavefront detection instruments. The wavefront reconstruction algorithm is primarily evaluated in three dimensions: accuracy, speed, and noise immunity. In this paper, we propose a hybrid zonal reconstruction algorithm that introduces slope and curvature information in the diagonal, anti-diagonal, horizontal, and vertical directions by dividing the neighbor sampling points into subregions in groups of four. By canceling the same parameters in integration equations, an algorithm using multi-directional slope–curvature information is achieved with only two sets of integration equations in each subregion, reducing the processing time. Simulation experiments show that the relative root-mean-square reconstruction error of this algorithm is improved by about 4 orders of magnitude compared with existing algorithms that use multi-directional slope information or slope–curvature information alone. Compared with the hybrid multi-directional slope–curvature algorithm, the proposed algorithm can reduce computation time by about 50% as well as provide better noise immunity and reconstruction accuracy. Finally, the validity of the proposed algorithm is verified by the null test experiment.

show abstract

Section: Introductionmentioning

confidence: 99%

Fast and Highly Accurate Zonal Wavefront Reconstruction from Multi-Directional Slope and Curvature Information Using Subregion Cancelation

Liu,

Zhong,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The Shack–Hartmann wavefront sensor (SHWFS) is an optical measurement device utilizing wavefront gradient measurements. The SHWFS, comprising a microlens array and a photodetector (CCD), has been widely applied for biomedical imaging, 1 , 2 astronomical imaging, 3 , 4 human eye aberration measurements, 5 , 6 high-energy laser beam quality testing, 7 , 8 and optical tweezers 9 . As a wavefront segmentation element, the microlens array segments the incident wave and focuses the incident wavefront in each sub-aperture on the focal plane of the microlens.…”

Section: Introductionmentioning

confidence: 99%

Shack–Hartmann wavefront sensor based on Kalman filter

Liu

2022

Opt. Eng.

View full text Add to dashboard Cite

The Shack-Hartmann wavefront sensor (SHWFS) traditionally employs the center of gravity (CoG), windowing, and thresholding CoG (TCoG) algorithms to measure wavefront aberrations. Nevertheless, these algorithms yield low accuracy in a low signal-to-noise ratio (SNR) environment, and therefore, we propose a measurement algorithm based on the Kalman filter to correct the three algorithms' centroid position of the Shack-Hartmann spot. When the Euclidean distance between the reference centroid in a sub-aperture and the measurement centroid exceeds a certain threshold, the sub-apertures centroid position is untrusted and must be corrected. Several simulation experiments are conducted in three environments: no noise, Poisson noise, and Gaussian noise; they demonstrate that the proposed algorithm effectively improves the centroid's accuracy by more than 10% and ensures real-time performance for the adaptive optics system. In addition, experimental results on wavefront reconstruction tasks reveal that our algorithm produces wavefronts close to the original.

show abstract

Statistical optimal parameters obtained by using clinical human ocular aberrations for high-precision aberration measurement

Yue,

Yang,

Chen

et al. 2024

Int Ophthalmol

View full text Add to dashboard Cite

Design and characterization of a safe Shack–Hartmann type aberrometer for making in-vivo measurements: Heuristic approximation

Cited by 3 publications

References 24 publications

Fast and Highly Accurate Zonal Wavefront Reconstruction from Multi-Directional Slope and Curvature Information Using Subregion Cancelation

Fast and Highly Accurate Zonal Wavefront Reconstruction from Multi-Directional Slope and Curvature Information Using Subregion Cancelation

Shack–Hartmann wavefront sensor based on Kalman filter

Statistical optimal parameters obtained by using clinical human ocular aberrations for high-precision aberration measurement

Contact Info

Product

Resources

About