Wide-field grating-prism imaging spectrometer: optical design and implementation

Abstract

A wide-field imaging spectrometer based on a grating prism is proposed. The grating and prism parameters are discussed to balance spectral distortion over the entire band. The design method of the grating-prism (GP) dispersive module and the catadioptric optics of the spectrometer are discussed in detail. A high optical speed (F/2.4) and long slit (29.4 mm) visible and near-infrared design with high image quality and small distortion is presented. The results show that the optical performance of the GP imaging spectrometer is excellent. The tolerance analysis indicates that the GP spectrometer can be easily manufactured and implemented. The prototype has been tested in the laboratory and outdoors, and the results confirmed that the design will be useful in the fields of aeronautics and astronautics.

Location and spectral extraction algorithm for a static broadband snapshot imaging spectrometer

“…However, for high-energy targets, such as the flash from an explosion, the plume from a missile or rocket, or even a small-scale nuclear explosion, which have location and spectral information that typically changes rapidly in time, conventional imaging spectrometers are often unable to acquire their spatial and spectral information in a very short time. For example, interferometric imaging spectrometers 6 – 13 require a long time to modulate spectra, filter-based imaging spectrometers 14 – 17 require a long time to separate spectral information, and dispersive imaging spectrometers 18 – 21 require a long time to collect spatial information perpendicular to the slit. Therefore, conventional imaging spectrometers are not well suited for locating and identifying the aforementioned high-energy targets.…”

High-Precision Ultra-Long Air Slit Fabrication Based on MEMS Technology for Imaging Spectrometers

“…The imaging spectrometer stands out due to its high spatial and spectral resolution. The growing need for accurate and efficient collection of spectral imaging data across diverse fields has prompted advancements in hyperspectral remote sensing technology, aiming for faster responses, wider coverage [16], higher spatial resolution, higher temporal resolution, and a higher signal-to-noise ratio. On the one hand, the satellite-borne spectrometer is set in a geostationary orbit, with its position relative to the ground being maintained at static and high orbit altitude.…”