Goniospectrophotometric Measurements

Custom measurement services

Avian Technologies offers measurement services in reflectance as a function of incident and receiving angles. This is referred to as goniospectrophotometrygonio being the Greek root for “angle.”

Goniospectrophotometric data are required to comprehend the full reflectance characteristics of any material, but especially gonioapparent materials, such as effect pigments, interference pigments, and other surfaces whose properties are specifically designed to change color as a function of angle of illumination and view. This data can be applied to fully specify the appearance of such complex materials. These specifications can be used in architectural modeling, gonio-apparent materials (pearlescents, effects pigments), rendering, or any application when normal measurement geometries are insufficient for the characterization of your materials.

Our Murakami GSP-1 can illuminate samples over the range of +/- 70° and detect over the same range*. Reflectance and or colorimetric data are provided at each angle pair. Reflectance is reported from 390 – 730 nm, sampled every 10nm.

*Note that some angle pairs are unavailable when the light source occludes the detector. This happens when the illumination and detection are separated by 15°or nearer.

In cases requiring non-standard geometries, we work closely with Avian Rochester, LLC. Our colleagues at Avian Rochester have access to a wide variety of flexible instrumentation to meet every customized measurement need.


All measurements are charged with a fixed setup fee, which includes instrument set up, calibration, verification, and documentation, plus a fee for each set of measurements. Quantity discounts are available. Contact us for pricing information for both standard and custom measurement services.

We pride ourselves in the quick turnaround of highly accurate and traceable measurements, typically within one week of receiving samples.

All data is reported in either 10 or 25 nm increments at 1 nm (UV-Vis) or 5 nm (UV-Vis-NIR) increments. Graphical data is presented. All samples are double or triple scanned and averaged.


Contact us to discuss your measurement needs.