INDUSTRIAL INSTRUMENTATION
OPTOMETRYINTRODUCTIONEr. FARUK BIN POYENDept. of AEIE, UIT, BU,
BURDWAN, WB, [email protected]
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Contents:OpticsRadiometryPhotometryTheories about LightTerms
related to RadiometryTerms related to PhotometryLaws of
IlluminationPrinciple of SuperpositionWave Property of
ParticlesWave Particle Duality09-09-2016OPTOMETRY - INTRODUCTION
Er. FARUK BIN POYEN2
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OPTICSBranch of Physics where nature and property of light are
studied.The scientific study of sight and the behaviour of light,
or the properties of transmission and deflection of other forms of
radiation.Classified into 09-09-2016OPTOMETRY - INTRODUCTION Er.
FARUK BIN POYEN3
Geometrical OpticsRectilinear Propagation of LightPhysical
OpticsWave Nature of LightQuantum OpticsParticle Nature of
Light
Radiometry & PhotometryRadiometry: Measurement of
electromagnetic radiation, including visible light. Radiometric
techniques in optics characterize the distribution of the
radiation's power in space.
Photometry: Measurement of light, in terms of its perceived
brightness to the human eye.
Photopic Vision: Response of eyes under normal light conditions
(555 nm).Scotopic Vision: Response of eyes under low light
conditions (507 nm).09-09-2016OPTOMETRY - INTRODUCTION Er. FARUK
BIN POYEN4
Different Theories about LightCorpuscular Theory of LightNewton
proposed this theory that treats light as being composed of tiny
particles having no mass and high speed. Failed to explain
refraction. Wave Theory of LightHuygens proposed light as waves
that spread out from the source that generates the light. Each
colour is a different wavelength. Supernumerary bows are explained
by assuming that light is a wave. Failed to explain propagation in
vacuum and existence of aether medium. The Electromagnetic Theory
of LightMaxwell proposed light as electromagnetic waves.
Propagation in vacuum explained. Quantum (Photon) Theory of
LightLight is energy particle named photon. The energy of the
photon determines the colour. Dual Theory of LightLight behaves
both as a particle and as a wave.
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Terms related to Radiometry
Radiant EnergyRadiant FluxRadiant IntensityRadianceRadiant
SteranceEmittanceRadiant ExcitanceIrradianceRadiant Incidence
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Terms related to PhotometryPoint SourceSolid AngleLumenLuminous
IntensityIlluminationLuminanceLuminous ExcitanceLuminous Sterance
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Laws of Illumination
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Principle of Superposition
For all linear systems, the net response at a given place and
time caused by two or more stimuli is the sum of the responses
which would have been caused by each stimulus individually.The
resultant displacement of two simultaneous waves (blue and green)
is the algebraic sum of the two displacements.
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Constructive InterferenceDestructive InterferenceThe
superposition of two coherent light waves results in light and dark
fringes on a screen.
Wave Property of Particles
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Wave Particle Duality
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THANK YOU!!09-09-2016OPTOMETRY - INTRODUCTION Er. FARUK BIN
POYEN12
