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Laser-based headlights offer the advantages of high luminance and compact size. Combining laser headlights with MEMS scanning mirror technology will be the key to enable new adaptive illumination functionality with high pixel resolution. This paper reports on applying a resonant biaxial MEMS scanning mirror in a laser phosphor illumination system....
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In fringe projection profilometry (FPP), the geometric calibration of the projector is based mainly on the assumption of the anti-camera model. But that model is not adequate for the non-camera model illumination devices, such as the lens-less laser projector based on MEMS, thus inducing errors in measurement results. Here we present a solution to...
Citations
... However, the main drawback of these coatings is that they exhibit high mechanical stress, which may have a negative impact on the reflective surface roughness [34]. To eliminate this problem, the mirror's thickness should be increased, for example, to 700 µm, but this leads to the afore-mentioned problem of the increased moment of inertia, which limits the fast steering, and in some cases, results in six orders of magnitude lower bandwidth [37]. ...
This paper presents a state-of-the-art overview of fine beam steering mechanisms for free-space optical communication on satellites. Precise beam pointing is a critical task for the successful operation of free-space optical communication systems. Based on past research and ongoing projects, the use of fast steering mirrors (FSMs) is still the most popular solution for free-space optical communication applications. Although a variety of commercial off-the-shelf (COTS) FSM solutions exist, there is limited publicly available data on these solutions in the space environment. Three main actuation principles are considered (electro-static force actuated, magnetic force actuated, piezo-effect actuated) and reviewed using available data from past space missions. The article describes the most important criteria in the choice of a fine beam steering solution for free-space optical communication in space.
In this research, an omnidirectional scanning micromirror fabricated using a three-dimensional (3D) printing process and manual assembly is presented. The core part of the scanning micromirror is printed with photocurable resin using vat polymerization based on digital light processing. Externally fabricated 6mm-diameter aluminum-coated silicon mirror plate, self-supported coils, and permanent magnets were assembled with the printed part to provide a reflective surface and electromagnetic actuation. Two types of devices with different spring shapes were designed and tested. Modal analyses were performed for each model with different magnet combinations in the design phase. To optimize the 3D printing process, resin mixtures with various mixing ratios were tested. An optical scan angle of 8.98° has been obtained for model #1 printed with an ABS-like resin at 309 Hz and an input current of 0.2 Arms. For model #2 printed with a 9:1 mixture of ABS-like resin and B9R-2-Black resin, an optical scan angle of 6.04° at 356 Hz an input current of 0.2 Arms has been obtained. Spiral scan patterns with various modulation depths were generated using model #1.
