Download Stray Light Analysis and Control (SPIE Press PM229) by Eric Fest PDF
By Eric Fest
Stray gentle is outlined as undesirable mild in an optical procedure, a well-known thought for a person who has taken a photo with the sunlight in or close to their camera's box of view. In a reasonably cheap shopper digicam, stray gentle could be just a minor annoyance, yet in a space-based telescope, it may possibly bring about the lack of info worthy hundreds of thousands of greenbacks. it's valuable that optical process designers comprehend its effects on process functionality and adapt the layout strategy to manage it.
This booklet addresses stray gentle terminology, radiometry, and the physics of stray mild mechanisms, equivalent to floor roughness scatter and ghost reflections. The most-efficient methods of utilizing stray gentle research software program applications are incorporated. The booklet additionally demonstrates how the elemental ideas are utilized within the layout, fabrication, and trying out stages of optical method improvement.
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Example text
4) where p() is the photopic luminosity function, which quantifies the response of a standard human eye to light. 6 Lumens are used to quantify the magnitude of the flux as perceived by the human eye and are not useful outside of the visible waveband. All of the radiometric units discussed in the following sections have photometric equivalents in which the flux is quantified using lumens. Radiometry performed using photometric units is called photometry. 2 The photopic luminosity function4 p().
It can also be used to validate some of the results obtained using stray light analysis software. Doing so is crucial, as setting up such an analysis in software can be complicated and difficult to do without errors. 1 Radiometric Terms This chapter introduces a number of radiometric quantities, many of which are defined in their differential form. 1) where d is the differential flux emitted by the source, and dA is the differential area of the source. It is important to note that, as with all differential equations, this equation reduces to M= if is constant over the area defined by A.
A comprehensive discussion of these effects is beyond the scope of this book;18 however, some important effects include the following: r All solid state detectors have noise that limits sensitivity, and this noise is proportional to the temperature of the detector material. For detectors operating in the MWIR (3–5 m) and longer wavelengths, the detector material generally must be cryogenically cooled in order for the detector noise to be low enough for the detector to be useful. r The number of electrons generated per incident photon is called the quantum efficiency of the detector and is a function of wavelength, as shown for several typical detector materials in Fig.