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KMID : 1137820080290050384
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의공학회지
2008 Volume.29 No. 5 p.384 ~ p.391
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Object Search Using Synchronous Ultrasonic Wave Emission for the Blind Guide system
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Kim Chang-Geol
Song Byung-Seop
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Abstract
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For use in the guide system for the people who are visually impaired, an obstacle searching device using synchronous ultrasonic wave emission was proposed and developed. Generally, the conventional obstacle detection methods use the ultrasonic distance measuring device with successive scan method. However, the scan method causes a theoretical error and it couldn’t estimate accurate obstacle distances. The proposed synchronous firing method use the plural number of ultrasonic sensors which emit ultrasonic wave simultaneously and estimate the distance to the closest obstacle relatively accurately. We analytically analyzed the errors of the conventional and proposed methods and compared the quantitative differences of the errors. The differences verified by obstacle search experiments. Using the proposed ultrasonic wave synchronous firing method, 3 dimensional obstacle location estimating device was designed and implemented. The results of the 3 dimensional obstacle detecting experiments showed the proposed method had good performances and it would be sufficiently use in the guide system for the people who are visually impaired.
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KEYWORD
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guide system, ultrasonic detection, the blind, assistive technology
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