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Abstract
We present a wide field of view (FOV) infrared scanning system, designed for single-pixel near-infrared thermal imaging. The scanning system consisted of a two-axis micro-electromechanical system (MEMS) mirror that was incorporated within the lens. The optical system consisted of two groups of lenses and a silicon avalanche photodiode. The system was designed for both the production of thermal images and also to utilize the techniques of radiation thermometry to measure the absolute temperature of targets from 500°C to 1100°C. Our system has the potential for real-time image acquisition, with improved data acquisition electronics. The FOV of our scanning system was ±30° when fully utilizing the MEMS mirror's scanning angle of ±5°. The pixel FOV (calculated from the distance to target size ratio) was 100:1. The image quality was analyzed, including the modulation transfer function, spot diagrams, ray fan plots, lateral chromatic aberrations, distortion, relative illumination, and size-of-source effect. The instrument was fabricated in our laboratory, and one of the thermal images, which was taken with the new lens, is presented as an example of the instrument optical performance.
Highlights
Temperature is an essential measurement in metrology that pervades our daily life
Where f 0 is the focal length, α is the fraction of enclosed radiant power percent of the measurement area, and Dp is the diameter of the avalanche photodiode (APD) active area
We have presented the design and realization of an infrared scanning system with an integrated MEMS mirror
Summary
Temperature is an essential measurement in metrology that pervades our daily life. It represents the average kinetic energy of particles in an object, which can be linked to many physical and chemical phenomena. The camera can produce high resolution thermal images of an object, directly benefiting from the large pixel count of a typical FPA detector [11]. This property raises challenges to the design of a quantitative temperature measurement system, because of the nonuniformity of spectral responsivity and. Different algorithms are adopted to reconstruct the image, which is one of the main advantages These systems do not have the problem of the nonuniformity of spectral responsivity and cross talk due to use of an SPD. Considering the limitations of radiation thermometers, thermal cameras, and DMD-based single-pixel imaging systems, we found it necessary to develop a multipurpose instrument to map temperatures accurately, traceably, and quickly across an object. The instrument was fabricated in our laboratory and used to produce thermal images of targets illuminated by an approximate blackbody furnace
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