1 November 2000 Stripe illuminator based on LED array and parabolic mirror for active triangulation sensors used on mobile robots
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Abstract
This article proposes a new, efficient and cost effective stripe illuminator for active optical triangulation sensors. The long distance stripe-shaped collimation of the light radiated by a linear LED array is achieved by means of a cylindrical parabolic mirror with a focus line coinciding with the internal reflectors of the LEDs. A computer based design process using a model of the LED is presented to find the optimal parabolic shape, radiating aperture and mounting tolerances. A very simple and inexpensive mechanical construction of the light source was realized. Test measurements showed that the light source produces a light stripe with an average incidence between 0.6-5.5 mW/cm2 depending on the range, which enables the detection of objects even with very low reflectivity. The width of the light stripe is 6-10 cm in the 0-2 m range, which allowed a resolution of 5-15 cm using it in a special stripe lighting sensor setup. Test results on an autonomous mobile robot are briefly presented. The eye safety of the source is also discussed.
Laszlo Domjan, Laszlo Domjan, Laszlo Kocsanyi, Laszlo Kocsanyi, Peter I. Richter, Peter I. Richter, Sandor Varkonyi, Sandor Varkonyi, } "Stripe illuminator based on LED array and parabolic mirror for active triangulation sensors used on mobile robots," Optical Engineering 39(11), (1 November 2000). https://doi.org/10.1117/1.1290580 . Submission:
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