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Zurich, Switzerland

Detailed Report on Bolometer Readings of Far-Infrared Emissivity
Date: 8/5/2023
Lab Technician: Dr. Hans Weber
Report No: SLIKS-2023-1547

To comprehensively measure the far-infrared emissivity of three objects: common 8 mm glass bead, clear crystal 8 mm glass bead, and 18 mm dense glass bead.


  • Sample Preparation: All samples were cleaned with isopropyl alcohol and air-dried in a dust-free chamber to ensure no surface contaminants.

  • Instrument Calibration: The bolometer was calibrated using a blackbody source to ensure accurate readings in the far-infrared range.

  • Measurement Procedure: Each sample was placed in the bolometer chamber, and emissivity was measured across the range from 5-50μm. Measurements were taken at intervals of 1μm.



  • Common 8 mm Glass: Exhibits a consistently high emissivity value across the measured spectrum. The peak emissivity at 15μm indicates its potential utility in applications where this wavelength is significant.

  • Clear 8 mm Crystal: The emissivity is slightly lower on average compared to common glass. Variations are observed between 20-22μm, suggesting different molecular structures or potential impurities affecting the readings in this range.

  • Dense 18 Glass: Despite its density, its emissivity profile is quite close to that of common 8 mm glass. This similarity is intriguing and suggests that density might have a direct correlation with emissivity in the far-infrared spectrum for glass samples.

Each of the three materials has unique, high emissivity profiles in the far-infrared spectrum. Their applications in technology and industry may vary based on these properties. 

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