stray light analysis and control pdf

Stray Light Analysis And Control Pdf

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As one of the experimental payloads on Luojia-1 satellite, the nighttime imaging camera works with a high sensitivity to acquire nighttime light on earth. Solar stray light is a fatal problem for optical satellite works in the polar orbit, even for nighttime scene imaging, resulting in image saturation and light signal detection failure. To solve this problem, an analysis of the range of solar incident angles was conducted firstly. Based on the result, a special-shaped baffle was designed to avoid direct sunlight incidence. Moreover, the capability of stray light elimination of the lens was enhanced by an order of magnitude via optimizing the internal structure.

Stray light is light in an optical system , which was not intended in the design. The light may be from the intended source, but follow paths other than intended, or it may be from a source other than the intended source. This light will often set a working limit on the dynamic range of the system; it limits the signal-to-noise ratio or contrast ratio , by limiting how dark the system can be. Optical measuring instruments that work with monochromatic light , such as spectrophotometers , define stray light as light in the system at wavelengths colors other than the one intended. The stray light level is one of the most critical specifications of an instrument. One method to reduce stray light in these systems is the use of double monochromators. Methods have also been invented to measure and compensate for stray light in spectrophotometers.

Click here to register. Stray light is defined as unwanted light in an optical system, a familiar concept for anyone who has taken a photograph with the sun in or near their camera's field of view. In a low-cost consumer camera, stray light may be only a minor annoyance, but in a space-based telescope, it can result in the loss of data worth millions of dollars. It is imperative that optical system designers understand its consequences on system performance and adapt the design process to control it. This book addresses stray light terminology, radiometry, and the physics of stray light mechanisms, such as surface roughness scatter and ghost reflections.

Journal of the Optical Society of America

Click here to register. Stray light is defined as unwanted light in an optical system, a familiar concept for anyone who has taken a photograph with the sun in or near their camera's field of view. In a low-cost consumer camera, stray light may be only a minor annoyance, but in a space-based telescope, it can result in the loss of data worth millions of dollars. It is imperative that optical system designers understand its consequences on system performance and adapt the design process to control it. This book addresses stray light terminology, radiometry, and the physics of stray light mechanisms, such as surface roughness scatter and ghost reflections. The most-efficient ways of using stray light analysis software packages are included.

Show all documents Top PDF Optical system design of star sensor and stray light analysis. Optical system design of star sensor and stray light analysis In this study, an optical system based on Double Gauss was designed for the star sensor. The purpose of the de- sign was to calculate a simple and lightweight optical system meeting all of the parameters of the optical sys- tem. For this purpose, the APS detector, that is suitable for space applications, was used.


PDF ISBN: | Print ISBN: DESCRIPTION. Expand your knowledge by taking the SPIE course Stray Light Analysis and Control.


Stray Light Reduction in Industrial Optics

Home Calibration Quality Control. Ankur Choudhary Print Question Forum 1 comment. Ensure that the connections of the spectrometer are proper. Measure the absorbance of potassium dichromate solution at the wavelengths given below. Acceptance criteria Wavelengths nm.

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Getting to know the principles of stray light reduction is key to getting accurate measurements while working with your optical device. If you use any of these optical instruments for important measurements or tests, get prepared to find out how to reduce stray light. Optical instruments play a crucial role in technological enhancements, not only in the field of optics but in many others as well, from medicine to astronomy.

Stray light analysis and control

Method of controlling optical surface roughness based on stray light requirements. SPIE Therefore, the optical designers are required to provide a roughness index for describing the specific surface or even all surfaces to ensure the final imaging performance.

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Теперь, считали они, им уже нечего было опасаться, представ перед Большим жюри, услышать собственный записанный на пленку голос как доказательство давно забытого телефонного разговора, перехваченного спутником АНБ. Никогда еще получение разведывательной информации не было столь легким делом. Шифры, перехваченные АНБ, вводились в ТРАНСТЕКСТ и через несколько минуты выплевывались из машины в виде открытого текста. Секретов отныне больше не существовало. Чтобы еще больше усилить впечатление о своей некомпетентности, АНБ подвергло яростным нападкам программы компьютерного кодирования, утверждая, что они мешают правоохранительным службам ловить и предавать суду преступников. Участники движения за гражданские свободы торжествовали и настаивали на том, что АНБ ни при каких обстоятельствах не должно читать их почту. Программы компьютерного кодирования раскупались как горячие пирожки.

Как пасхальное яйцо. - Я сказал, что ты занял мое место. - Впервые тебя вижу, - сказал Беккер вставая. Не хватало еще ввязаться в драку.

Выросший в протестантской семье, он всегда считал, что католики ужасно медлительны. Теперь он молил Бога, чтобы священник не торопился, ведь как только служба закончится, он будет вынужден встать, хотя бы для того чтобы пропустить соседей по скамье. А в своем пиджаке он обречен. Беккер понимал, что в данный момент ничего не может предпринять.

Ни души.

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