Super-resolution for a dispersive spectrometer using a tilted area sensor and spectrally varying blur kernel interpolation

Opt Express. 2021 Jan 18;29(2):2809-2818. doi: 10.1364/OE.414479.

Abstract

The grating, lens, and linear sensor determine a spectrometer's wavelength resolution and measurement range. While conventional methods have tried to improve the optical design to obtain a better resolution, they have a limitation caused by the physical property. To improve the resolution, we introduce a super-resolution method from the computer vision field. We propose tilting an area sensor to realize accurate subpixel shifting and recover a high-resolution spectrum using interpolated spectrally varying kernels. We experimentally validate that the proposed method achieved a high spectral resolution of 0.141nm in 400-800nm by just tilting the sensor in the spectrometer.