Measurement error of a Shack-Hartmann wavefront sensor in strong scintillation conditions

1998 ◽  
Author(s):  
Mark L. Plett ◽  
Pierre R. Barbier ◽  
David W. Rush ◽  
Penelope Polak-Dingels ◽  
Bruce M. Levine
Keyword(s):  
Measurement Error ◽  
Wavefront Sensor

scholarly journals Исследование возможности измерения радиусов зеркал приборами с датчиками волнового фронта

2019 ◽  
Vol 127 (10) ◽  
pp. 594
Author(s):  
А.А. Сахаров ◽  
Т.С. Пискунов ◽  
Н.В. Барышников ◽  
И.В. Животовский ◽  
Е.Е. Мухина ◽  
...  
Keyword(s):  
Measurement Error ◽  
Measurement Technique ◽  
Wavefront Sensor ◽  
Theoretical Substantiation ◽  
Prototype Device ◽  
The Given

AbstractA technique has been developed for measuring the radii of curvature of optical parts. A scheme of the device based on a wavefront sensor is proposed, which is characterized by a minimum measurement error. The theoretical substantiation of the measurement technique is given. A number of methods that make it possible to measure the radii of curvature of optical parts are considered. The reasons for an increase in the measurement error are analyzed. The results of measurements according to the given methodology with an original prototype device are considered.

scholarly journals Measurement Error of Shack-Hartmann Wavefront Sensor

10.5772/29430 ◽  
2012 ◽  
Author(s):  
Chaohong Li ◽  
Hao Xian ◽  
Wenhan Jiang ◽  
Changhui Rao
Keyword(s):  
Measurement Error ◽  
Wavefront Sensor

Benefits from Computerized Adaptive Testing as Seen in Simulation Studies

1999 ◽  
Vol 15 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Lutz F. Hornke
Keyword(s):  
Measurement Error ◽  
Computerized Adaptive Testing ◽  
Test Procedure ◽  
Adaptive Testing ◽  
Parameter Estimates ◽  
Simulation Studies ◽  
Computerized Adaptive Test ◽  
Item Banks ◽  
Item Parameters ◽  
General Reliability

Summary: Item parameters for several hundreds of items were estimated based on empirical data from several thousands of subjects. The logistic one-parameter (1PL) and two-parameter (2PL) model estimates were evaluated. However, model fit showed that only a subset of items complied sufficiently, so that the remaining ones were assembled in well-fitting item banks. In several simulation studies 5000 simulated responses were generated in accordance with a computerized adaptive test procedure along with person parameters. A general reliability of .80 or a standard error of measurement of .44 was used as a stopping rule to end CAT testing. We also recorded how often each item was used by all simulees. Person-parameter estimates based on CAT correlated higher than .90 with true values simulated. For all 1PL fitting item banks most simulees used more than 20 items but less than 30 items to reach the pre-set level of measurement error. However, testing based on item banks that complied to the 2PL revealed that, on average, only 10 items were sufficient to end testing at the same measurement error level. Both clearly demonstrate the precision and economy of computerized adaptive testing. Empirical evaluations from everyday uses will show whether these trends will hold up in practice. If so, CAT will become possible and reasonable with some 150 well-calibrated 2PL items.

Measurement error and person-specific reliability in multilevel autoregressive modeling.

2019 ◽  
Vol 24 (1) ◽  
pp. 70-91 ◽  
Author(s):  
Noémi K. Schuurman ◽  
Ellen L. Hamaker
Keyword(s):  
Measurement Error ◽  
Autoregressive Modeling

Technical Memoranda. Measurement error for six port ana

1990 ◽  
Vol 137 (6) ◽  
pp. 415 ◽  
Author(s):  
E. Bergeault ◽  
B. Huyart ◽  
G. Geneves ◽  
L. Jallet
Keyword(s):  
Measurement Error
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