1. OPTIKA Dr. Seres István Photometry

2. Snesor Physics Seres István 2 http://fft.szie.hu 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)

3. Snesor Physics Seres István 3 http://fft.szie.hu Fotometry The solid angle of an elementary area: dd  r dA dA cos 

4. Snesor Physics Seres István 4 http://fft.szie.hu 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

5. Snesor Physics Seres István 5 http://fft.szie.hu 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

6. Snesor Physics Seres István 6 http://fft.szie.hu Fotometry  (nm) V 4800.139 4900.208 5000.323 5100.503 5200.71 5300.862 5400.954 5500.995 5551 5600.995 5700.952 5800.87 5900.757 6000.631 6100.503 6200.381 6300.265 6400.175 Luminous flux

7. Snesor Physics Seres István 7 http://fft.szie.hu Fotometry The energy emitted by a unit time: Luminous flux

8. Snesor Physics Seres István 8 http://fft.szie.hu Fotometry Luminous flux

9. Snesor Physics Seres István 9 http://fft.szie.hu Fotometry Illumination: Luminous flux on a unit surface

10. Snesor Physics Seres István 10 http://fft.szie.hu Fotometry Light utilization

11. Snesor Physics Seres István 11 http://fft.szie.hu 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

12. Snesor Physics Seres István 12 http://fft.szie.hu Fotometry Photometers Subjektiv photometry Photocell semiconductor diode

13. Snesor Physics Seres István 13 http://fft.szie.hu Fotometry Subjektive photometry

14. Snesor Physics Seres István 14 http://fft.szie.hu Fotometry Subjective photometry Weber photometer Bunsen fotometer: Relative measurement

15. Snesor Physics Seres István 15 http://fft.szie.hu Fotometry Photocell

16. Snesor Physics Seres István 16 http://fft.szie.hu Fotometry Photodiode

17. Snesor Physics Seres István 17 http://fft.szie.hu Fotometry Photodiode

18. Snesor Physics Seres István 18 http://fft.szie.hu Fotometry Photodiode

19. Snesor Physics Seres István 19 http://fft.szie.hu Fotometry Köszönöm a figyelmet!