(a) Schematic design of the CT instrument. L 1 and L 2 are afocal telescopes to collimate incoming light. The rotating DVP disperses light as a function of wavelength, and L 3 acts as a focusing lens to produce an image on the detector array. Distances, D, are in mm. (b) The material and geometry of the direct vision prism.
The spectral displacement curve in terms of the angular spectral dispersion of the prism and the total displacement in pixels at the detector array for a 0° field angle.
The shift in displacement Δr at the array as a function of three input field angles θ I to the prism; θ I = 0.1° (solid line), θ I = 0.5° (dashed line), and θ I = 1.0° (dotted line).
An example of the peaks fit to the extracted Ne spectrum in the 3D reconstructed imagery. The dotted line is the data; the solid line represents the fitted peaks.
The spatial resolution results for the black body source (o), spectral sources (□), and the measured spatial resolution in the 3D reconstructed data (▲). The dashed curve is the predicted resolution from the model of the system after adjusting for the detector coupling.
The expected PRF from the model of the system. The spatial resolution of the collection system is shown as the dotted line. The spatial resolution in the reconstructed 3D hyperspectral data is shown as the dashed line.
The measured spectral resolution from the 3D R(x,y,λ) data (o), the predicted spectral resolution from the system (solid line), and the expected resolution given estimated error in reconstruction (■).
The predicted spectral displacement r(λ) compared to that measured in the P(x,y,θ) sets: θ = 0° (♦), θ = 90° (□), θ = 180° (o), and θ = 270° (x). Residuals in terms of pixels and wavelength, λ, are shown below the plot with a noticeable correlation between the P(x i ,y i ,0°) and P(x i ,y i ,90°) data and the P(x i ,y i ,180°) and P(x i ,y i ,270°) data.
The residuals between the measured and modeled dispersion after a linear correction is applied based on measurements of the spectral dispersion in the data used in this experiment. The symbols are the same as those in Figure 8.
Prominent pen lamp wavelengths (nm).
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