The snapshot image mapping spectrometer (IMS) is a hyper-spectral imaging system that simultaneously captures spatial and spectral information about an object in a single integral time. The spectral calibration can help to obtain accurate 3D datacube of the objects. This paper proposes a new approach to improve the spectral calibration accuracy of the instrument. By adding a slit mask into the optical path to reduce crosstalk, the accuracy of each sub pupil center and spectral channel location can be improved. The calibration process is simulated to analyze the effects of the size and position designed for the mask. The analysis results show that the calibration accuracy of each sub pupil center position and spectral channel position for IMS is 3μm, which is significantly improved than the calibration accuracy 10.5μm without the mask.
The snapshot image mapping spectrometer (IMS) is the development of modern optical imaging instruments that combine advanced technologies in medical, biomedicine, remote sensing, etc. The technology has the potential of becoming a fundamental research for high-resolution and high-throughput optical imaging system. The image mapper is the most critical component in the IMS technology and consists of many mirror facets fabricated with a 2D tilt angle. However, these components are very difficult to fabricate and often become the limiting factor in the performance of the system. Therefore, the mirror 2D tilt angle errors are presented for analyzing the center of pupils to be displaced in the virtual apertures in the system. In this research, to accurately describe the relation between reflected light’s steering angle and corresponding mirror facet’s tilt angle. We propose a light ray tracing model which provides a rigorous analytical solution for the relation between mirror facet’s tilt angle and reflected light’s steering angle. Then the mirror tilt angle error model was established to analyze the influence of the image mapper based on reflected light’s steering angle. The results indicate that the tilt angle error increased causes the deviation from the center of the sub aperture, decrease the image intensity and loss of light throughput. The proposed method can be used to estimate the accuracy of sub pupil’s center position, and the conclusions will be helpful in the design and manufacture of the image mapper.
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