wavelength selection devices 1. absorption filters 2. interference filters 3. prism monochromators...
TRANSCRIPT
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Wavelength Selection Devices
1. Absorption Filters
2. Interference Filters
3. Prism Monochromators
4. Grating Monochromators
5. Interferometers
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1. Absorption Filters
Optical material containing an absorber that permits transmission only at certain wavelengths
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2. Interference Filter
A “sandwich” of at least two parallel optical flats that transmit only rays that undergo constructive interference.
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3. Prism Monochromator
Wavelength selection device containing a movable prism.
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Snell’s Law of Refraction
n1sin Θ1 = n2sin Θ2
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4. Grating Monochromator
Wavelength selection device based on the constructive interference of light rays that have traveled different differences to reach the same point.
Work via:
(1) transmission, or
(2) reflection
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Reflection Grating:
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Linear DispersionDl
Dl = f × Da = dx/dλ
where:
f = focal length(of monochromator)
x = distance(along focal plane)
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Spectral Bandpass(s or Δλ)
s = RLD × w
where:
w = slit width (mm)
s in nm
Reciprocal LinearDispersion (RLD)
RLD = Dl-1
=dλ/dx
nm/mm
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Echelle
prism
ICP
Camera
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Rowland Circle
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Limitations??
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5. Interferometer
Allows multiple wavelengths to fall on the detector simultaneously.
Corrects for interference patterns to calculate the signal at different wavelengths.
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Fabrey-Perot Interferometer
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Michelson Interferometer
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Interferometer Advantages
1. Fellget’s Advantage (multiplex)
2. Jacquinot’s Advantage (throughput)
3. Wavelength Accuracy
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Interferometer Disadvantages
1. Fellget’s Disadvantage (multiplex)
2. Low wavelengths
3. $$$ for high resolution