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Area of Science:

Optical Metrology
Photometry

Background:

Compact double-beam goniophotometers are increasingly used for absolute measurements.
Potential sources of error in these instruments are often overlooked.
Accurate radiance factor measurements are critical in various optical applications.

Purpose of the Study:

To identify and quantify overlooked error sources in compact double-beam goniophotometers.
To evaluate the impact of detection solid angle on measurement accuracy.
To provide guidance for improving measurement reliability.

Main Methods:

Investigated two primary error sources: geometric error and convolution error.
Simulated the 3D bidirectional reflectance distribution function (BRDF) for anisotropic samples.
Evaluated errors using different detection solid angles in a compact goniophotometer.

Main Results:

Relative errors of 1%-3% in radiance factor measurements were observed.
Errors are dependent on viewing angle and sample optical properties.
Failure to apply recommended corrections leads to significant relative errors.

Conclusions:

Geometric and convolution errors related to detection solid angle are significant.
These errors can be comparable to total measurement uncertainty.
Findings are vital for users of compact goniophotometers to ensure measurement accuracy.