Design of a static Fourier transform long-wave infrared imaging spectrometer using interferometric supersampling and the rolling shutter method

Abstract

Temporally-spatially modulated Fourier transform imaging spectrometers employing interferometric dimension supersampling technology enable precise spectral reconstruction, even when the Nyquist sampling rate is not satisfied. Traditional super-resolution methods often require multiple focal plane detector shifts during a single super-resolution process, leading to low timing resolution. This study introduces a novel super-resolution technique leveraging detector rolling shutter exposure. By modifying the exposure time delay across multiple rows of the detector during its movement, the method achieves evenly spaced exposures within the time required for the detector to shift by a single pixel. The results demonstrate that under conditions of a 6000 μm lateral shear and a detector resolution of 384 × 288 pixels, the instrument achieves a spectral resolution performance of 2.67 cm-1 with an 8 × supersampling factor. Notably, the supersampling process requires only 33 milliseconds, significantly faster than the 614 milliseconds reported in previous studies. This study was conducted at the National Key Discipline Laboratory of Color Science and Engineering, Beijing Institute of Technology, Beijing, China, during the fourth quarter of 2024.