SPF Testing – Optical Properties

The performance of thermal collectors and PV modules depends significantly on the glass used. The measurement and certification procedure developed at SPF is internationally recognized as a reference and evaluates the specific properties required for good solar glass.

Optical transmission
Transmission measurement for wave-lengths in the range 0,29 µm to 2,5 µm. For PV applications the transmission measurement can be corrected for the reflection at the glass rear surface.

Weighted transmission
Calculation based on the optical transmission measurement and different weighting spectra result in specific rating numbers; for example the solar transmission from a weighted integration with the AM1.5 solar Spectrum (ISO 9845-1).

Incident angle modifier
Determination of transmission in relation to the angle of incidence.
Specific measurement equipment is used for solar thermal or pv applications.

Absorptance
Absorptance measurement for wave-lengths in the range 0,3 µm – 18 µm and determination of solar absorptance (absorptance α) through weighted integration with the AM1.5 spectrum (ISO 9845-1).

Emittance
Emittance measurement for wave-lengths in the range 0,3 µm – 18 µm and calculation of thermal emittance through weighted integration with the spectrum of a black body at a temperature of 100 °C (emittance ε).

SPF Testing Optical Properties Transmittance graphic

SPF Testing Optical Properties IAM graphic

SPF Testing Optical Properties Absorber graphic

SPF Testing – Optical Properties

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