Abstract
Snapshot spectral imaging technology plays an important role in many fields. However, most existing snapshot imaging spectrometers have the shortcomings of a large volume or heavy computational burden. In this paper, we present a novel snapshot imaging spectrometer based on the pixel-level filter array (PFA), which can simultaneously obtain both spectral and spatial information. The system is composed of a fore-optics, a PFA, a relay lens, and a monochromatic sensor. The incoming light first forms an intermediate image on the PFA through the fore-optics. Then, the relay lens reimages the spectral images on the PFA onto the monochromatic sensor. Through the use of the PFA, we can capture a three-dimensional (spatial coordinates and wavelength) datacube in a single exposure. Compared with existing technologies, our system possesses the advantages of a simple implementation, low cost, compact structure, and high energy efficiency by removing stacked dispersive or interferometric elements. Moreover, the characteristic of the direct imaging mode ensures the low computational burden of the system, thus shortening the imaging time. The principle and design of the system are described in detail. An experimental prototype is built and field experiments are carried out to verify the feasibility of the proposed scheme.
Highlights
Imaging spectrometers are dedicated devices used for capturing both spatial and spectral information simultaneously
The capability of capturing data during a single integration time of the imaging sensor guarantees a great extent of synchronization between multiple snapshot imaging spectrometers, a property utilized in remote sensing to acquire estimates of bidirectional reflectancedistribution function by a fleet of spatially, directionally, and temporary coordinated devices [13]
Compared with the existing snapshot imaging spectrometers, as the data are directly obtained by our system, the post-processing requires less of a computation load, enabling its application in time-crucial tasks
Summary
Imaging spectrometers are dedicated devices used for capturing both spatial and spectral information simultaneously. Spectral-scanning imaging spectrometers based on filter wheel or variable filters, such as acousto-optic filters (AOTF) [8] and liquid crystal tunable filters (LCTF), can provide a high data acquisition speed, but suffer from low transmission efficiency [9]. Snapshot imaging spectrometers can acquire spatial and spectral data within the single integration time of the imaging sensor [10,11,12].
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