Results 211 to 220 of about 8,969 (258)
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Self-calibration for transmitted wavefront measurements
Applied Optics, 2007Micro-optic components and subsystems are becoming increasingly important in optical sensors, communications, data storage, and many other diverse applications. To adequately predict the performance of the final system, it is important to understand the element's effect on the wavefront as it propagates through the system. The wavefront can be measured
Brent C, Bergner, Angela, Davies
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Subaperture stitching for measurement of freeform wavefront
Applied Optics, 2015A method based on subaperture stitching for measurement of a freeform wavefront is proposed and applied to wavefronts calculated from the slope data acquired using a scanning Shack Hartmann sensor (SHS). The entire wavefront is divided into a number of subapertures with overlapping zones.
Kamal K, Pant +7 more
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LADARWave Wavefront Measurement in Normal Eyes
Journal of Refractive Surgery, 2004ABSTRACT PURPOSE: We evaluated the correlation of Alcon LADARWave wavefront measurements with clinical refraction and corneal topography. METHODS: In a retrospective, non-comparative case series, 60 eyes (30 patients) of healthy individuals evaluated by preoperative examination for refractive surgery were enrolled (manifest sphere, -
Maria Regina, Chalita +3 more
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Absolute calibration of a Shack-Hartmann wavefront sensor for measurements of wavefronts
Photonic Instrumentation Engineering VI, 2019A high-quality flat wave front is usually used to calibrate the Shach-Hartmann wave-front sensors. The article discusses the possibility of calibrating sensors with spherical wave fronts. Special attention is paid to the consideration of calibration in standard laboratory conditions.
Alexander N. Nikitin +7 more
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Wavefront measurement with synthesizing method
SPIE Proceedings, 2000This paper discussed the test of a wavefront with large aperture using synthetic wavefront method. This method means the whole tested wavefront was divided into a limited numbers of sub-apertures and Moire fringe moving was used to measure the average slopes of wavefront on the sub-apertures and then the whole wavefront was synthesized. The paper dealt
Cheng Wang +4 more
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Wavefront-coded phase measuring deflectometry for the all-focused measurement
Optics Letters, 2022Phase measuring deflectometry is a powerful measuring method for complex optical surfaces, which captures the reflected fringe images encoded on the screen under the premise of focusing the measured specular surface. Due to the limited depth of field of the camera, the captured images and the measured surface cannot be focused at the same time.
Zhenqi Niu +5 more
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Journal of the Optical Society of America A, 2021
An iterative wavefront reconstruction method using Shack–Hartmann wavefront sensor (SHWFS) measurements is presented in this paper. A new cost function for the wavefront reconstruction problem is derived and the solution is obtained iteratively using the gradient descent method.
Jae Jun, Kim +2 more
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An iterative wavefront reconstruction method using Shack–Hartmann wavefront sensor (SHWFS) measurements is presented in this paper. A new cost function for the wavefront reconstruction problem is derived and the solution is obtained iteratively using the gradient descent method.
Jae Jun, Kim +2 more
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Traceable measurements with wavefront sensors
SPIE Proceedings, 2005Wavefront sensors, particularly those of the Hartmann-Shack type are now available in commercial form from several manufacturers. They have found increasing use in medical and industrial applications and, for consistent measurements over a range of instruments and measurement situations, traceability of measurement is essential.
S. D. Knox, S. R. Hall, R. F. Stevens
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Journal of Cataract and Refractive Surgery, 2003
To evaluate the accuracy and repeatability of the WaveScan WavePrint system and the Tracey wavefront aberrometer in measuring refractive errors in phakic eyes.Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.Using subjective manifest refraction (MR) as the standard, the spherical equivalent (SE), sphere, and cylinder were compared ...
Li, Wang, Nan, Wang, Douglas D, Koch
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To evaluate the accuracy and repeatability of the WaveScan WavePrint system and the Tracey wavefront aberrometer in measuring refractive errors in phakic eyes.Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, USA.Using subjective manifest refraction (MR) as the standard, the spherical equivalent (SE), sphere, and cylinder were compared ...
Li, Wang, Nan, Wang, Douglas D, Koch
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The Theoretical Effect of Measured Wavefront Diameter on Estimating Peripheral Wavefront Data
Journal of Refractive Surgery, 2004<p>ABSTRACT</p><p>PURPOSE: To compare the difference between wavefront data measured in the periphery and that calculated from estimations using a smaller measured region.</p><p>METHODS: A total of 32 eyes were measured using the Alcon LADARWave aberrometer (Alcon Laboratories Ine, Fort Worth, Tex).
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