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Components of Optical Instruments or What’s inside that spectrometer?

Components of Optical Instruments or What’s inside that spectrometer?. Components of Optical Instruments. Signal Processor Readout. Source. Wavelength Selector. Sample. Detector. Emission Flame Photometer Flame Atomic Absorption Spectrometer Absorption Spectrometer

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Components of Optical Instruments or What’s inside that spectrometer?

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  1. Components of Optical Instruments or What’s inside that spectrometer?

  2. Components of Optical Instruments Signal Processor Readout Source Wavelength Selector Sample Detector Emission Flame Photometer Flame Atomic Absorption Spectrometer Absorption Spectrometer Fluorescence and/or Scattering Spectrometer

  3. Components ofOptical Instruments Emission Flame Photometer Signal Processor Readout Source Wavelength Selector Detector Sample

  4. Components ofOptical Instruments Flame Atomic Absorption Spectrometer Signal Processor Readout Source Wavelength Selector Detector Sample

  5. Components ofOptical Instruments Absorption Spectrometer Signal Processor Readout Source Sample Wavelength Selector Detector

  6. Components ofOptical Instruments Fluorescence and/or Scattering Spectrometer Signal Processor Readout Sample Wavelength Selector Detector 0-90o Source

  7. Components of Optical Instruments Fig. 7-2, pg. 145 ”(a) Construction materials

  8. Components of Optical Instruments Fig. 7-2, pg. 145 ”(b) wavelength selectors for spectroscopic instruments."

  9. Components of Optical Instruments

  10. Components of Optical Instruments

  11. Sources YOU TELL ME!

  12. I l Sources of radiation Blackbody Radiation:

  13. Monochromator – can vary wavelength – scan spectrum Prism – shorter wavelengths dispersed more

  14. Grating – Dispersion of light is linear in l

  15. Types of gratings – most common – echellette UV-visible  1200 –1400 grooves /mm IR  hundreds of grooves/mm Holographic Gratings – made by laser technology – very cheap, easy to make and very reproducible, can produce up too 6000 grooves/mm.

  16. Width of Slits

  17. Effective Bandwidth – Dleff = wD-1 reciprocal linear dispersion, the inverse of the linear dispersion (D, mm/nm), which is the spreading of the light by a monochromator grating. d is the distance between blazes on the grating, and F is the focal length of the monochromator. w= slitwidth when Dy = w, Dl is the effective bandwidth

  18. Example: To tell the difference between 589.6 and 589.0 nm light, what slitwidth would be required?

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