The optical design of a reflective objective system of a thermal camera for a syndromic surveillance system that captures bio-clinical signals, like temperature, directly related to the physical symptoms of the COVID-19 disease through thermal images is presented. The design is based on an off-axis four mirror system that allows for correcting spherical, coma, astigmatism, and field curvature aberrations. The OFOS design works on wavelengths of 7.5 μm - 14 μm, with an f-number less than 5, and a field of view (FOV) greater than 10 degrees.
We present a new optical design of an off-axis three-mirror system (OTS) that is corrected for spherical, coma, astigmatism, and field curvature aberrations. Our design methodology begins using paraxial theory and continues with the third-order approach for a coaxial three-mirror system (CTS) with a wide field of view and high resolution. We propose to use only two optical elements because the primary and tertiary mirrors will be integrated in a single optical element, the secondary mirror will be the other optical element. For our final design, we will use only off-axis surfaces. Thus it will be possible to obtain a compact, light, easy-to-align optical system with high stability. However, when the CTS is transformed into an OTS, new aberrations are generated. The last step in our methodology is to use freeform surfaces to compensate for new aberrations. With this methodology, a limited diffraction system is obtained.
In this study was made a comparison between the optical coherence tomography and microscope images. We obtain
images from different biological tissues, and from a designed epoxy phantom to analyze if the SR-OCT 930 can obtain
images similar to microscopy images. The result is that the OCT images and the microscopy images are similar. Also
developed a software to analyze the OCT images without distorting the structures in the image when the image is obtain
in different image sizes.
The optical coherence tomography images are useful to see the internal profile and the structure of material samples. In
this work, OCT images were recorded in 10 volunteers with different skin tone which were related to Raman spectra.
The areas where we obtained OCT images and Raman spectra were a) index finger nail, b) between index finger and
middle finger, c) middle finger tip, d) half of middle finger, e) the thumb finger tip and f) between index finger and
thumb, areas measured were for the purpose of finding extracellular fluids with contain triglycerides, cholesterol and
glucose that are reported in the literature. The excitation wavelength used for this work was 785 nm, a spectrometer of
6 cm-1 resolution. The spectral region used ranges from 300 to 1800 cm-1. We use an OCT with 930 nm of Central
Wavelength, 1.6 mm of Image Depth, 6 mm of image width and 6.2 μm of axial resolution.
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