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BASIC OPTICAL SENSING (Optical Phenomena (Interference (image,…
BASIC OPTICAL SENSING
Properties of light
Irradiance,Ir/Intensity
Irradiance,Ir: The power incident onto surface (W/m2)
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Intensity,I: Power per unit of solid angle in a given direction (W/sr)
Electromagnetic waves have power which called Poynting,S:
Irradiance is the average of the Poynting:
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Basic Sensing Principle
SCD principle
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Detector: Eye, the height of the Hg column
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Optical Phenomena
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Diffraction
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the corresponding angular resolution is
Interference
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Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other
a phenomenon inside which two waves superpose to form a resultant wave of greater, lower, or the same amplitude
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Brewster's angle
An angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection
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