Monochromatic spatial response measurement for focal plane array with an heterodynally referenced optical grating
Abstract
Accurate generation of well-defined spatial frequencies remains a key challenge in many imaging applications. A particularly demanding case is the spatial response measurement of focal plane arrays (FPAs). For small-pitch FPAs, where pixel size approaches the wavelength, classical optical systems act as stronger filters than the detectors themselves, making reliable modulation transfer function evaluation difficult. Uncertainty in the optical transfer function of the projection system, and thus in the projected spatial frequencies, further undermines measurement accuracy. In hyperspectral imaging, this challenge is compounded by the need for monochromatic response measurements at multiple wavelengths. To address these limitations, we introduce a novel type of grating that generates two-dimensional sparse spatial frequencies whose amplitudes are quantitatively encoded along the optical axis through a longitudinal heterodyne signature. As this signature depends on both spectral and spatial parameters, the proposed grating provides a robust approach for precise monochromatic transfer function characterization of FPAs.
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BibTeX
@article{arrondeau2026monochromatic,
title = {{Monochromatic spatial response measurement for focal plane array with an heterodynally referenced optical grating}},
author = {Pierre Arrondeau and Edouard Huard de Verneuil and Jérôme Primot and Clémentine Durnez and Sophie Derelle},
journal = {Optics Communications},
year = {2026},
month = nov,
doi = {10.1016/j.optcom.2026.133370},
url = {https://hal.science/hal-05856696v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Monochromatic spatial response measurement for focal plane array with an heterodynally referenced optical grating
AU - Pierre Arrondeau
AU - Edouard Huard de Verneuil
AU - Jérôme Primot
AU - Clémentine Durnez
AU - Sophie Derelle
PY - 2026
DA - 2026/11/09
JO - Optics Communications
DO - 10.1016/j.optcom.2026.133370
UR - https://hal.science/hal-05856696v1
AB - Accurate generation of well-defined spatial frequencies remains a key challenge in many imaging applications. A particularly demanding case is the spatial response measurement of focal plane arrays (FPAs). For small-pitch FPAs, where pixel size approaches the wavelength, classical optical systems act as stronger filters than the detectors themselves, making reliable modulation transfer function evaluation difficult. Uncertainty in the optical transfer function of the projection system, and thus in the projected spatial frequencies, further undermines measurement accuracy. In hyperspectral imaging, this challenge is compounded by the need for monochromatic response measurements at multiple wavelengths. To address these limitations, we introduce a novel type of grating that generates two-dimensional sparse spatial frequencies whose amplitudes are quantitatively encoded along the optical axis through a longitudinal heterodyne signature. As this signature depends on both spectral and spatial parameters, the proposed grating provides a robust approach for precise monochromatic transfer function characterization of FPAs.
SN - 0030-4018
SN - 1873-0310
ER -