An Acousto-Optic Colorimeter
Abstract
Uniform color spaces and color-difference formulae rest on visual data obtained almost entirely with surface samples and conventional displays, whose primaries confine the measurements to a limited chromaticity range. The highly saturated region of color space is therefore the least measured part of human color perception, at the moment when quantum-dot, microLED, and laser displays have begun to operate inside it. Closing this gap requires stimuli more saturated than any fixed-primary device can produce, together with the stability and uniformity demanded by visual experiments. We present an acousto-optic colorimeter built for this purpose. A four-channel acousto-optic tunable filter selects narrow spectral components from a supercontinuum laser over the calibrated range of 443--660~nm, with measured linewidths of 1.37--3.20~nm; the wavelength and radiance of every component are set electronically, so the primary set itself becomes an experimental variable. A compact diffuser--light-pipe homogenizer combines the selected components into a uniform observation field, and spectral feedback stabilizes their intensities. The calibrated primary set covered 95\% of the area enclosed by the CIE 1964 10∘ spectral locus in the x,y chromaticity plane. The calculated maximum luminance reached 1406~cd\,m−2, with 328~cd\,m−2 available at the gray Robertson chromaticity. Across an 18-mm observation field the mean spatial ΔE00 difference was 0.913, and five Robertson color centers reproduced under continuous feedback gave mean target errors of 0.34--1.26~ΔE00 over 10-min intervals. The instrument thus delivers calibrated, uniform, and stable highly saturated stimuli, and is intended to extend the empirical basis of color-difference measurement into the region where data are still absent.
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BibTeX
@misc{aksentsev2026acoustooptic,
title = {{An Acousto-Optic Colorimeter}},
author = {Pavel Aksentsev and Georgiy Lobarev and Sergey Korchagin and Olga Polschikova and Egor Ershov},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.07988},
eprint = {2610.07988},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.07988},
}
RIS
TY - UNPB
TI - An Acousto-Optic Colorimeter
AU - Pavel Aksentsev
AU - Georgiy Lobarev
AU - Sergey Korchagin
AU - Olga Polschikova
AU - Egor Ershov
PY - 2026
DA - 2026/10/06
PB - arXiv
DO - 10.48550/arxiv.2610.07988
UR - https://arxiv.org/abs/2610.07988
AB - Uniform color spaces and color-difference formulae rest on visual data obtained almost entirely with surface samples and conventional displays, whose primaries confine the measurements to a limited chromaticity range. The highly saturated region of color space is therefore the least measured part of human color perception, at the moment when quantum-dot, microLED, and laser displays have begun to operate inside it. Closing this gap requires stimuli more saturated than any fixed-primary device can produce, together with the stability and uniformity demanded by visual experiments. We present an acousto-optic colorimeter built for this purpose. A four-channel acousto-optic tunable filter selects narrow spectral components from a supercontinuum laser over the calibrated range of 443--660~nm, with measured linewidths of 1.37--3.20~nm; the wavelength and radiance of every component are set electronically, so the primary set itself becomes an experimental variable. A compact diffuser--light-pipe homogenizer combines the selected components into a uniform observation field, and spectral feedback stabilizes their intensities. The calibrated primary set covered 95\% of the area enclosed by the CIE 1964 10^∘ spectral locus in the x,y chromaticity plane. The calculated maximum luminance reached 1406~cd\,m^−2, with 328~cd\,m^−2 available at the gray Robertson chromaticity. Across an 18-mm observation field the mean spatial ΔE_00 difference was 0.913, and five Robertson color centers reproduced under continuous feedback gave mean target errors of 0.34--1.26~ΔE_00 over 10-min intervals. The instrument thus delivers calibrated, uniform, and stable highly saturated stimuli, and is intended to extend the empirical basis of color-difference measurement into the region where data are still absent.
ER -