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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
Components of

Optical Instruments

or

What’s inside that spectrometer?

components of optical instruments
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

components of optical instruments1
Components ofOptical Instruments

Emission Flame Photometer

Signal Processor

Readout

Source

Wavelength Selector

Detector

Sample

components of optical instruments2
Components ofOptical Instruments

Flame Atomic Absorption Spectrometer

Signal Processor

Readout

Source

Wavelength Selector

Detector

Sample

components of optical instruments3
Components ofOptical Instruments

Absorption Spectrometer

Signal Processor

Readout

Source

Sample

Wavelength Selector

Detector

components of optical instruments4
Components ofOptical Instruments

Fluorescence and/or Scattering Spectrometer

Signal Processor

Readout

Sample

Wavelength Selector

Detector

0-90o

Source

components of optical instruments5
Components of Optical Instruments

Fig. 7-2, pg. 145 ”(a) Construction materials

components of optical instruments6
Components of Optical Instruments

Fig. 7-2, pg. 145 ”(b) wavelength selectors for spectroscopic instruments."

sources
Sources

YOU

TELL

ME!

sources of radiation

I

l

Sources of radiation

Blackbody Radiation:

slide22

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

types of gratings most common echellette
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.

slide26

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

slide27

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