Abstract
We have developed a basic approach and a design for snapshot recording of multispectral information, based on a dispersive polychromator with mirror objectives. By means of numerical modeling, we have shown that the halfwidth of the blur spots for 11 spectral bands in the 400–700 nm range, for imaging points at the center and on the periphery of the object field, is not greater than 15 μm for a focal length of the camera mirror equal to 100 mm. Owing to the use of simple optical elements, the design can serve as the basis for making inexpensive devices for a wide range of spatially resolved imaging spectroscopy applications.
Highlights
In spatially resolved imaging spectroscopy, a popular method for generating a data cube (the dependences of the intensity I(x, y, λ) on the coordinates of the object image х, у and the radiation wavelength λ) is to record a set of spectra I(xi, yi, λ) for a set of image points (xi, yi) [1, 2]
Such an approach has a number of fundamental limitations, due to incomplete suppression of light transmission beyond the spectral band nominally to be selected by an individual optical filter
The indicated deficiency becomes an even greater obstacle to obtaining reliable spectral and spatial information as the widths of the bands to be selected by the optical filter decrease: the background transmission integrated over the spectrum may be comparable with the spectral transmission within the narrow band to be selected
Summary
In spatially resolved imaging spectroscopy, a popular method for generating a data cube (the dependences of the intensity I(x, y, λ) on the coordinates of the object image х, у and the radiation wavelength λ) is to record a set of spectra I(xi, yi, λ) for a set of image points (xi, yi) [1, 2] Another method presumes that for a set of relatively narrow spectral bands with centers at λk, a set of "quasimonochromatic images" I(х, у, λk) is recorded: "multispectral imaging" [3]. There is certainly interest in a design based on diffraction spectral filtering which can provide higher spectral resolution and effective suppression of the background Such dispersive devices can be called image monochromators. Besides the obvious gain in capability for making on-the-fly measurements (a short time is required to obtain the data cube), such an approach lets us record I(x, y, λ) for a broad class of nonstationary objects
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