Fluorescence and transmittance spectrophotometer measurements
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Fluorescence and Transmittance Spectrophotometer Measurements Donna Kubik 02/04/04 Measurements The goal was to measure and compare the emission spectra and transmittance of the three types of scintillators tested for the DHC plus the MINOS scintillator

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Fluorescence and transmittance spectrophotometer measurements l.jpg

Fluorescence and Transmittance Spectrophotometer Measurements

Donna Kubik

02/04/04


Measurements l.jpg
Measurements Measurements

  • The goal was to measure and compare the emission spectra and transmittance of the three types of scintillators tested for the DHC plus the MINOS scintillator

  • All samples were machined to the same thickness

    • BC 408

      • Cast scintillator

    • EJ 200

      • Cast scintillator

    • FNAL/NICADD

      • Extruded scintillator

    • MINOS

      • Extruded scintillator


Fluorescence l.jpg
Fluorescence Measurements

  • Used an Hitachi F-4500 fluorescence spectrophotometer

    (at Lab 6, FNAL)

    • 1nm resolution

    • 200nm-730nm range

    • Xenon lamp

Hitachi F-4500


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Fluorescence spectrophotometer: Measurementsmodes of operation

Frontside illumination

Backside illumination

~300 nm

~300 nm

mirror

scintillator

scintillator


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Absorption/transmission Measurements

  • Used an HP UV-Vis Diode-Array Spectrophotometer

    (at Lab 6, FNAL)

    • 2nm resolution

    • 190nm-820nm range

    • Deuterium lamp

      • Covers UV and Vis

HP 8452A Diode Array Spectrophotometer


Absorption transmission spectrophotometer operation l.jpg
Absorption/transmission Measurementsspectrophotometer: operation

Deuterium

lamp

Dispersion device

Slit

Scintillator

Diode array


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Fluors Measurements

  • Instead of using the same fluors as used in the cast scintillators, different (less costly) fluors were used to fabricate the MINOS and FNAL extruded scintillators

  • The MINOS and FNAL scintillators were designed so that the final emission peak is similar to that of BC408 and EJ200, all of which must be compatible with WSF.


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Fluors Measurements

  • The following slides show:

    • The emission peaks for the cast scintillators

      • PT 350nm

      • Bis-MSB 420nm

  • The emission peaks for the extruded scintillators

    • PPO 365nm

    • POPOP 420nm


Slide9 l.jpg

1 Measurementsst harmonic of the

Excitation wavelength

Excitation wavelength


Fluors10 l.jpg
Fluors Measurements

  • The 365nm and 420nm (for PPO and POPOP) are the emission maxima for each compound.  The remaining bands are part of the PPO and POPOP spectrum. 

  • For PPO and POPOP there are roughly 3 peaks for each, one at each side of the maximum, but it’s difficult to see, because there is a lot of overlap in the middle.

  • It is easier to see in the PT and bis-MSB samples, because the two spectra do not overlap as in the case of PPO and POPOP.


Superimpose frontside and backside emission l.jpg
Superimpose frontside and backside emission Measurements

  • Note that, for each sample, the peaks from the backside illumination are at the same wavelength as the longest- wavelength peaks from frontside illumination,

    ~420nm.

  • Zoom on next slide


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~420nm Measurements

~420nm


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Emission spectra Measurements

  • The emission for BC408 and EJ200 are the same, ~422nm

  • Although the chemistry of the FNAL and MINOS scintillators is the same, there is a small difference in the wavelength of maximum emission, 417.6nm vs. 419.8nm

  • Zoom on next slide


Transmittance spectra l.jpg
Transmittance spectra Measurements

  • The difference in emission peaks between the FNAL and MINOS scintillator may be explained by the difference in absorption/transmittance

  • To remove the surface effects due to the different finish quality of each sample, the transmittance spectra were corrected to 100% transmittance at 820nm (because we know that there isno absorption at long wavelengths)


Slide18 l.jpg

Peaks may be due to D Measurements2

Halpha= 656.3nm

Absorbed by polystyrene


Emission and transmittance spectra l.jpg
Emission and transmittance spectra Measurements

  • The next 3 slides show the emission spectra superimposed on the transmittance spectra

  • The first shows all of the measured spectra

  • The next 2 slides zoom in on the onset of transmission, revealing that transmission for the FNAL scintillator begins at a slightly shorter wavelength than the other scintillators


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Emission spectra Measurements

  • The measurements are consistent with the BC408 and EJ200 data sheets


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