Space Engineering - Payload Design

03. Optical instruments

Divided by topic

Optical In ! ruments Refractors Optical Sens ! s Reflectors PinHole Model Scanning Mechanisms WhiskBr ! m Mechanism Pus hBr ! m Mechanism Pus hBr ! m Scann " s Scanning P ! amet " s Detect # s Feat ! es of " e Sensing Mat # ials - Spec $ al Response, % ates " e & equency band to which " e detect ' is sensitive. Ex. Silicon 200 nm to 1000 nm - Quantum E ( iciency is " e numb # of photoelec $ ons emi ) ed p # incident photon, ex * e+ed as a p # centage (goes & om 0 to 100%). It is & om a % ati % ical point of easi # f' c # tain en # gy level to * omote " e elec $ ons " an f ' o " # s. In gen # al on " e datash , t you find it as a function kf " e spec $ al response. A quantum e ( iciency of 100% means " at one elec $ on is emi ) ed f ' each incident photon. So f ' 50% it means " at to ex $ act 1 elec $ on 2 photons - e n , ded. - Noise Equivalent Pow # (NEP) d . ectly related to " e noise * oduced by " e in % rument. It is given at ambient temp # at ! e typica /y and " e noise can be reduced by c 0 ling " e detect ' . The f . % two, in % ead, cannot be changes by modifying " e design as " ey - e in $ insica /y dependant on " e mat # ial " ey - e composed of. The f . % two - e " e feat ! es to select " e detect ' in " e f . % it # ation. Then we have o " # s: How a CCD w ! ks? How a CMOS w ! ks?