GeomOpt_Part5

GeomOpt_Part5 - Department of Electrical and Computer...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Department of Electrical and Computer Engineering ECSE 527 Optical Engineering adiometry Radiometry References: Smith, Modern Optical Engineering, Chapter 8 .O’Shea D.O Shea, Elements of Modern Optical Design, Chapter 3 Andrew Kirk 2009 Radiometry-1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Radiometry ©AGK 2009 Radiometry-2
Background image of page 2
Radiometry ptical systems perform two operations: Optical systems perform two operations: – transfer of object structure (imaging) ansfer of object power (radiometry) transfer of object power (radiometry) • Power transfer determines visibility, detector performance etc. • Sometime we only need power transfer – e.g. searchlight, projector lamps • How do we calculate power emitted from object and ansferred through an optical system ? ©AGK 2009 Radiometry-3 transferred through an optical system ?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example: Surface inspection problem Diffuse (70% reflecting) urface Lens (80% transmission) Aperture: 4 cm 2 surface 200 cm Area: 1 cm 2 Detector 100 cm 60° 100 cm Lambertian source 15 cm diameter 115 cm diameter 10 W ster -1 cm -2 ©AGK 2009 Radiometry-4 Question: How much total power is received at the detector ?
Background image of page 4
Learning outcomes After taking this section you will be able to: • Define radiant intensity and irradiance • Calculate the radiant intensity and irradiance of a oint source point source • Explain what is meant by a Lambertian source • Determine when to treat emitters and surfaces as Lambertian surfaces • Calculate the emission of a Lambertian surface • Calculate power transfer through an optical system ©AGK 2009 Radiometry-5
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Contents Definition of radiometric units Point sources Lambertian emitters Power transfer through an optical system Constant brightness theorem ©AGK 2009 Radiometry-6
Background image of page 6
Power and radiant intensity • Power P : Rate of radiation of energy [W] Power from a point source fills a sphere of adiant ower radiated into a solid 4 π steradians Radiant intensity J : Power radiated into a solid angle [W ster -1 ] J = P /4 π W ster - 1 ©AGK 2009 Radiometry-7
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Irradiance • Irradiance Unit area Distance S Point source Intensity J W ster -1 Power P W Solid angle 1/ S 2 ster ©AGK 2009 Radiometry-8
Background image of page 8
Example • 10 W source • Intensity: • Radiation on surface 100 cm from source: ©AGK 2009 Radiometry-10
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/28/2010 for the course ECSE ECSE 527 taught by Professor Kirk during the Winter '10 term at McGill.

Page1 / 34

GeomOpt_Part5 - Department of Electrical and Computer...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online