Base Information
Volume
V52 - N4 / 2019 Ordinario
Reference
51028: 1-7
DOI
http://dx.doi.org/10.7149/OPA.52.4.51028
Language
English
Keywords
Obstacle's detection, Blind, Visual disability, Infrared emission and detection.
Abstract
In this paper, the design, manufacturing process and testing of a device able to detect obstacles at head level is presented. The device's functionality is based on emission and detection of infrared light and the tactile stimulus. The design was performed in order to detect objects, from the head and up to 150 cm away. The fabrication was done using both an infrared emitter and detector with a 940 nm wavelength; for the signals processing a commercial LM567 Texas Instruments® chip was used. Tests were performed on closed and open spaces, obtaining tactile response with objects placed at 150 cm on closed spaces and placed at 100 cm in open spaces. To further improve the device's performance on open spaces an optical filter was used on the phototransistor.
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