fotomeetrial

Fotomeetrial is a proposed multidisciplinary approach to quantifying how light interacts with materials, combining elements of photometry, metrology, and materials science to assess irradiation effects, color stability, and light-induced changes. The term is used in niche publications and industry discussions as a framework for systematic measurement, rather than as a widely formalized discipline.

Etymology and scope: The name appears to be a portmanteau of photo- (light) and metrical or measurement concepts. Fotomeetrial encompasses the assessment of optical properties such as luminous flux, illuminance, spectral power distribution, transmittance, reflectance, and color coordinates, as well as photochemical and physical changes caused by light exposure.

Principles and methods: Practice typically involves calibrated light sources (for example, LEDs or broad-spectrum lamps), integrating spheres, and sensors such as spectroradiometers and colorimeters. Measurements are conducted under standardized sample geometries and environmental conditions, with data interpreted in color spaces like CIE XYZ or L*a*b*. Photochemical indicators, degradation metrics, and aging indicators may be tracked alongside traditional radiometric values to capture both instantaneous and time-dependent effects.

Applications: Fotomeetrial concepts are relevant to evaluating the lightfastness of pigments, inks, and coatings; studying photo-induced aging in polymers and textiles; calibrating photoresists and imaging materials; and informing lighting design for art conservation, museums, and display environments where material appearance and durability under light are critical.

Standards and status: There is no dedicated international standard specific to fotomeetrial as of now. Practitioners typically rely on established photometry, colorimetry, and durability standards (for example, ISO, CIE, and ASTM guidelines) to structure measurements and compare results across studies. See also: Photometry, Metrology, Colorimetry, Photodegradation, Lightfastness.