8 May 2012 Optical characterization of a miniaturized large field of view motion sensor
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Abstract
In this paper we discuss the geometrical and optical characterization of a miniaturized very wide field-of-view (FOV) motion sensor inspired by the working principle of insect facet eyes. The goal of the sensor is to detect movement in the environment and to specify where in the surroundings these changes took place. Based on the measurements of the sensor, certain actions can be taken such as sounding an alarm in security applications or turning on the light in domotic applications. The advantage of miniaturizing these sensors is that they are low-cost, compact and more esthetical compared to current motion detectors. The sensor was designed to have a very large FOV of 125° and an angular resolution of 1° or better. The micro-optics is built up of two stacked polymer plates consisting each out of a five by five lens array. In between there is a plate of absorbing material with a five by five array of baffles to create 25 optically isolated channels that each image part of the total FOV of 125° onto the detector. To geometrically characterize the lens arrays and verify the designed specifications, we made use of a coordinate measuring machine. The optical performance of the designed micro-optical system was analyzed by sending white light beams with different angles of incidence with respect to the sample through the sensor, comparing the position of the light spots visible on the detector and determining optical quality parameters such as MTF and distortion.
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Els Moens, Heidi Ottevaere, Youri Meuret, Hugo Thienpont, "Optical characterization of a miniaturized large field of view motion sensor", Proc. SPIE 8428, Micro-Optics 2012, 842813 (8 May 2012); doi: 10.1117/12.922203; https://doi.org/10.1117/12.922203
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