587 08 wk05b filt_grats_det ch7 std

587 08 wk05b filt_grats_det ch7 std - Optical Components...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Optical Components Chemistry 587 Chapter 7: Components of optical instruments – Radiation Sources • continuum sources (also see previous notes from on blackbody…), – Wavelength selection •F i l ters – Interference filters » Edge filters » Bandpass filters – Absorption filters • Monochromators – design – gratings and prisms – dispersion of grating monochromators – monochromator slits and resolving power •In ter ferome try –Design of the Michelson interferometer – Sample containment • material must be considered –Detec tors • photon transducer examples – photomultiplier tubes (PMTs) – multichannel charge coupled devices (CCDs) • thermal transducer examples – thermocouple – pyroelectric transducers – Fiber optics Radiation Sources Sample &
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 Taken directly from - http://en.wikipedia.org/wiki/Fluorescent_lamp#Mechanism_of_light_production - Filled with low pressure mercury vapor and argon (or xenon), or more rarely argon-neon, or sometimes even krypton -Inner surface of the bulb is coated with a fluorescent coating (& slightly phosphorescent) - made of blends of metallic and rare-earth phosphor salts -Bulb's cathode is typically made of coiled tungsten - Tungsten is coated with barium, strontium & calcium oxides (chosen for low thermionic emission temperature) -Tunsgsten coil emits electrons -electrons collide with noble gas (~23 Torr; 0.3% of atm pressure) -ionizes the noble gas atoms -forms a plasma by impact ionization
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/17/2008 for the course CHEM 587 taught by Professor Allen during the Spring '08 term at Ohio State.

Page1 / 8

587 08 wk05b filt_grats_det ch7 std - Optical Components...

This preview shows document pages 1 - 3. Sign up to view the full document.

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