Mid-spatial frequency errors of mass-produced aspheres

Messelink, Wilhelmus A. C. M.; Amy, Frantz; Ament, Shelby D. V.; Stairiker, Matthew

doi:10.1117/12.2318663

Cited by 2 publications

(1 citation statement)

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“…These midspatial frequency surface errors can lead to reduced system resolution, stray light, reduced uniformity of the illumination system, and so on [25]. Therefore the influence of midspatial frequency surface errors on the ASPALs needs to be considered besides the surface irregularities characterized by PV and RMS [26][27][28][29][30][31].…”

Section: Consideration Of Mid-spatial Frequency Surface Errors For Aspalmentioning

confidence: 99%

The Current Situation of Family Education and School and Kindergarten Admission of Migrant Children in Zhejiang Province, China: A Survey of Hangzhou, Ningbo and Jiaxing

Gao

Feng

et al. 2020

EJES

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Based on a survey of 322 parents of migrant children aged 3 to 10 in Hangzhou, Ningbo and Jiaxing, Zhejiang Province, China, the study found that nearly 70% of parents have been working in Zhejiang for 5-10 years, and 28% of them have worked for more than 10 years; 94% of them hold agricultural household registration and 6% of them hold non-agricultural household registration. Nearly 70% of these families have 2 to 3 children and 16% of them have 4 children. Those children who can get into the local public kindergartens and primary schools are all study in the local institutions and most school-aged children and the majority of pre-school children who do not meet the admission requirements for local public kindergartens and primary schools return to their hometown due to the pressure of tuition fees. At the same time, family education is not efficient, more than half of the children’s spare time is occupied by television and video games, the proportion of reading and sports activities is only a little more than 10%. Most parents have little time to read, do homework and physical exercise with their children, because of their heavy work or low level of education. This paper puts forward some relevant countermeasures and suggestions, hoping to change this situation. Article visualizations:<img src="/-counters-/edu_01/0629/a.php" alt="Hit counter" />

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Section: Consideration Of Mid-spatial Frequency Surface Errors For Aspalmentioning

confidence: 99%

The Current Situation of Family Education and School and Kindergarten Admission of Migrant Children in Zhejiang Province, China: A Survey of Hangzhou, Ningbo and Jiaxing

Gao

Feng

et al. 2020

EJES

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Understanding Aspheric Lenses

Adams¹,

Ament²

2018

Optik & Photonik

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Aspheric lenses are an extremely powerful tool for improving the performance of optical systems whilst also reducing the number of elements and consequently size and weight. From medical equipment and microscopes to smart phones and autonomous vehicles, they are increasingly important across all optics‐enabled industries. An aspheric surface cannot be made in the same way as a spherical one, a range of sub‐aperture grinding and polishing techniques must be used to create a variable curvature. These methods create additional issues that need to be monitored and controlled to maximize the performance of an aspheric lens.

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Mid-spatial frequency errors of mass-produced aspheres

Cited by 2 publications

References 3 publications

The Current Situation of Family Education and School and Kindergarten Admission of Migrant Children in Zhejiang Province, China: A Survey of Hangzhou, Ningbo and Jiaxing

The Current Situation of Family Education and School and Kindergarten Admission of Migrant Children in Zhejiang Province, China: A Survey of Hangzhou, Ningbo and Jiaxing

Understanding Aspheric Lenses

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