OPTIKA Dr. Seres István Photometry. Snesor Physics Seres István 2 Fotometry Used quantities: angle: length fo arc/radius Solid angle:

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Presentation transcript:

OPTIKA Dr. Seres István Photometry

Snesor Physics Seres István 2 Fotometry Used quantities: angle: length fo arc/radius Solid angle: area/radius squared r  i Central angle of a circle: 2  (radian) Central angle of a sphere: 4  (steradián) (steradián = sr)

Snesor Physics Seres István 3 Fotometry The solid angle of an elementary area: dd  r dA dA cos 

Snesor Physics Seres István 4 Fotometry Overview: Radiometrical quantityUnitFotometrical quantity Unit Emitted power (Φ e )WLuminous flux (Φ v ) lm Irradiation (E e ) (Power density) W m -2 Illumination (E v )lx Irradiation density (L e )W m -2 sr -1 Brilliancy (L v )cd m-2

Snesor Physics Seres István 5 Fotometry Luminous flux Spectral sensitivity of the eye (visibility function) Sensitivity max of the human eye: 555 nm Power: 1 watt Luminous flux: 683 lumen Maximal spectral utilization

Snesor Physics Seres István 6 Fotometry  (nm) V Luminous flux

Snesor Physics Seres István 7 Fotometry The energy emitted by a unit time: Luminous flux

Snesor Physics Seres István 8 Fotometry Luminous flux

Snesor Physics Seres István 9 Fotometry Illumination: Luminous flux on a unit surface

Snesor Physics Seres István 10 Fotometry Light utilization

Snesor Physics Seres István 11 Fotometry Fotometers Important properties of light sensors 1.The spectral dependence of the sensor is coincidence with the visibility function V(λ) 2.The photocurrent is proportional to the illumination 3.The angled irradiation is detected as the cosine of the incliment angle

Snesor Physics Seres István 12 Fotometry Photometers Subjektiv photometry Photocell semiconductor diode

Snesor Physics Seres István 13 Fotometry Subjektive photometry

Snesor Physics Seres István 14 Fotometry Subjective photometry Weber photometer Bunsen fotometer: Relative measurement

Snesor Physics Seres István 15 Fotometry Photocell

Snesor Physics Seres István 16 Fotometry Photodiode

Snesor Physics Seres István 17 Fotometry Photodiode

Snesor Physics Seres István 18 Fotometry Photodiode

Snesor Physics Seres István 19 Fotometry Köszönöm a figyelmet!