Four instrumental setups are used to characterize roofing samples:

• Fourier-Transform Infra-Red (FTIR) Spectral Emissometer
• UV-VIS-NIR Spectrometer with an integrating sphere
• Solar Spectrum Reflectometer
• Emissometer

Fourier-Transform Infra-Red (FTIR) Spectral Emissometer

FTIR Spectrometer

This infrared spectrometer is specially modified to determine the spectrum of heat radiation emitted by a small sample of roofing material heated to simulate a hot roof. Link to: Roof Heat Transfer The spectrometer can measure the emittance of rough surfaces. Link to: Roof Heat Transfer > Emittance Sample emittance measurements for some examples of cool roofing materials are available. Link to: Cool Roofing Samples

This spectrometer is based on the Bruker IFS 28 FTIR spectrometer. Its Cesium Iodide (CsI) optics cover a spectral distribution of emittance from 5 to 40 µm. The Heat Island Group's set-up is unique in the United States.

UV-VIS-NIR Spectrometer with an integrating sphere

UV-VIS-NIR Spectrometer

This instrumentation (Perkin-Elmer Lambda 19) is used to determine the spectral solar (diffuse) reflectance in accordance with ASTM Standards. The spectral range is from 0.3 to 2.5 µm. This device belongs to Berkeley Lab's Windows and Daylighting Group Sample solar reflectance measurements for some examples of cool roofing materials are available. Link to: Cool Roofing Samples

Solar Spectrum Reflectometer

Devices & Services Reflectometer

This instrument (by Devices & Services, Co.) can determine solar reflectance values very quickly and simply. We have measured many materials. Link to: Roof Heat Transfer > "Various Materials in Sunlight" This device also gives coarse spectral detail in four spectral bands. For field measurements, solar reflectance is determined by pyranometer measurements (not shown).

Emissometer

Devices & Services Emissometer

This basic emittance device determines the total thermal emittance, in comparison with standard high and low emittance materials. It is read out with the voltmeter on the left. This device was manufactured by Devices & Services, Co.