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... distances. A light beam is projected on a surface forming an "object point", s. The scattered light from the point on the surface is collected by a converging lens [13]. The "image point" s is produced after the lens and is registered by a detection system. If a displacement ∆ of the surface under test is made, the object point is displaced (Fig. 2). Therefore, the position of the image point on the detector is also displaced. The image displacement δ on the detection system allows us to know which was the displacement of the object point and, therefore, of the surface. The angle θ is the one between the laser beam, which incides perpendicularly on the surface under test, and the ...
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Citations
... A través del fotodetector del sensor acusto-óptico, se miden las posiciones de los máximos del patrón de difracción proyectados y las distancias entre los mismos. Por lo tanto, una configuración adecuada para el diseño del detectoróptico es un arreglo de fotodiodos discretos [21] [22]. En una etapa del diseño del sensor posterior a la optimización del sistema de iluminación y proyección, en la que se diseñará e implementará el fotodetector, será muy importante tener en cuenta las especificaciones de relación señal a ruido, ancho de banda y margen de fase [23]. ...
Trabajo extendido del poster presentado en el XIV Encuentro de Estudiantes de Óptica y Fotónica (EEOF) / XIX Taller de Óptica y Fotónica (TOPFOT) 2024 en el Instituto Balseiro, San Carlos de Bariloche, Río Negro, Argentina, en marzo de 2024.
Abstract: In previous works we presented a novel multiparametric sensor to simultaneously measure the refractive index and the speed of sound in a liquid by means of the acousto-optic effect. The sensor requires an illumination system that expands the laser beam so that it interacts effectively with the liquid under study. Also, a projection system is necessary in order to adequately capture the diffraction pattern at the cell exit. In this article, we present the optimization of the sensor illumination and projection system using the optical design computational tool Zemax OpticStudio. The considered range of refractive indices of the liquid samples is between 1.33 and 1.51. The results show a correct expansion of the incident beam on the cell, and the projection system achieves an image with very few aberrations and an adequate angular separation between the maxima of the diffraction pattern. Based on the resulting dimensions of the sensor after optimizing the illumination and projection system, we confirm that it is compact and portable.
Optical detection systems design is a complex task involving coupled constraints. We propose a merit function and a genetic algorithm that has several advantages over other methods, such as systematic search or Monte Carlo.
https://www.frontiersinoptics.com/home/eposters/poster/?id=3795901
