A method to improve spatial resolution and spectral resolution of aotf imaging

Abstract

The invention relates to the field of the acousto-optic turnable filter (AOTF) spectral imaging technology and relates to a method for improving the imaging spatial resolution and the spectral resolution of an AOTF. An optimization algorithm is provided to approach to true value through repeated iteration. At a certain wavelength, the light intensity of each pixel imaged by a charge coupled device (CCD) is subtracted by the light intensity of an obtrusive light under the broadening effect of the spectrum and the diffraction angle so as to obtain the true value of the light intensity, wherein the true value is obtained through repeated iteration. Therefore, the final imaging spatial resolution and the spectral resolution are improved through the repeated iteration process of the data cube of two-dimensional images and one-dimensional spectrums obtained by the AOTF. The method comprises the steps of firstly, conducting the broadening measurement on the diffraction angle of the AOTF; secondly, conducting the broadening measurement on the diffraction spectrum of the AOTF, and obtaining the diffraction efficiency eta (xi+m, yj, lambda k, md lambda) based on the above two measurement results; thirdly, obtaining the light intensity I0 (xi, yj, lambda k) of a to-be-measured target at the pixel (xi, yj) of the CCD through the spectral imaging process of the AOTF; fourthly, conducting the repeated iteration operation according to a formula. The above method is mainly applied in the spectral imaging aspect.

Description

technical field [0001] The present invention relates to the technical field of AOTF spectral imaging, and more specifically, relates to a method for improving the spatial resolution and spectral resolution of AOTF imaging, which is a method for improving the spatial resolution and spectral resolution of AOTF by using multiple iterative optimization algorithms according to the characteristics of AOTF diffraction. resolution method. Background technique [0002] Compared with traditional spectroscopic elements, Acousto-optic tunable filter (AOTF) has the advantages of small size, fast tuning speed, wide spectral range, and high diffraction efficiency. In recent years, AOTF-based imaging spectroscopy technology has attracted more and more attention from researchers. AOTF-based imaging spectrometers have found applications in remote sensing, environmental monitoring, biomedicine, and food testing. The spatial resolution and spectral resolution of the AOTF imaging spectroscopy ...

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Problems solved by technology

However, this method only considers the image shift phenomenon caused by the dispersion of the central wavelength of the main peak after AOTF filtering, and does not consider the side lobes and certain broadening of the spectrum after AOTF filtering, that is, there are still differences in diffraction angle and wavelength in AOTF diffraction. Broadening, which will lead to a lower spatial resolution of the imaging of the AOTF in the diffraction direction, and also lead to a decrease in spectral resolution

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