1 / 17

Properties of light – A tool in Energy and Environmental Physics

Properties of light – A tool in Energy and Environmental Physics. F. Sigernes A trial lecture @ NTNU. A-M Ampère 1775-1836 . M. Faraday 1791-1867. OERSTED, H. C. 1777-1851 . C. F. Gauss 1777-1855 . J. C. Maxwell 1831-1879. H. R. Hertz 1857 - 1894. M. Planck 1858 - 1947 .

trista
Télécharger la présentation

Properties of light – A tool in Energy and Environmental Physics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Properties of light – A tool in Energy and Environmental Physics F. Sigernes A trial lecture @ NTNU

  2. A-M Ampère 1775-1836 M. Faraday 1791-1867 OERSTED, H. C. 1777-1851 C. F. Gauss 1777-1855 J. C. Maxwell 1831-1879 H. R. Hertz 1857 - 1894 M. Planck 1858 - 1947 • Einstein • 1879 - 1955 N. Bohr, 1885-1962 Images are taken from search engine Google Images

  3. A plane polarized sinusoidal wave!

  4. VISIBLE LIGHT

  5. DISRETE SPECTRA – ABSORPTION AND EMISSION

  6. Nordkvist (2006) Intensity = Lifetime x # atoms energized

  7. CONTINOUS SPECTRA

  8. BASIC PROPERTIES OF LIGHT • Light is electromagnetic waves – radiation • It travels through empty space • The speed is constant as a function of wavelength • It is polarized depending on direction or rotation of E • Light are emitted or absorbed in discrete chunks of energy • These packets of energy – photons - have energy E=hv • Photons are released as a response to jumps in atomic / molecular • energy levels (from Bohr’s model of the atom) • 8) Light is both a particle (photon) and a wave – depends how we observe it. • 9) Intensity is directly related to number of photons emitted from an object. • 10) Objects emits light in form of continuous or discrete spectra – • depending mainly on density and temperature. • 11) Light has wavelike behavior: it reflects, refracts, diffracts and interfere...

  9. “Spectroscopy – is the tool to study the properties of objects.” Basics of a hyperspectral imager – a camera that that images as a function of wavelength!

  10. Basics of an airborne hyperspectral imager- bush broom (Zsolt, 2006)

  11. VEGETATION – ROCKS - SEA & FRESH WATER

  12. VEGETATION UNDER WATER

  13. SCRIMPS: SKALL, SKALL IKKE!

  14. REFERENCES Douglas C. Giancoli, Physics for Scientists and Engineers, 2. ed. , Prentice Hall, Englewood Cliffs, New Jersey 07632, US, ISBN 0-13-669201-X, US, 1988. Astronomy Notes (2004 Edition) by Nick Strobel, ISBN 0073122491, http://www.astronomynotes.com/ *Sample data are from experiments at Fiskeriforskning in Tromsø and from airborne campaigns at UNIS.

More Related