The application of laser triangulation method on the blind guidance

Jih-Huah Wu; Jinn-Der Wang; Wei Fang; Yi-Chia Shan; Shih-Hsin Ma; Hai-Ko Kao; Joe-Air Jiang; Yun-Parn Lee

doi:10.1117/12.893000

14 September 2011 The application of laser triangulation method on the blind guidance

Jih-Huah Wu, Jinn-Der Wang, Wei Fang, Yi-Chia Shan, Shih-Hsin Ma, Hai-Ko Kao, Joe-Air Jiang, Yun-Parn Lee

Proceedings Volume 8133, Dimensional Optical Metrology and Inspection for Practical Applications; 81330V (2011) https://doi.org/10.1117/12.893000
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

A new apparatus for blind-guide is proposed in this paper. Optical triangulation method was used to realize the system. The main components comprise a notebook computer, a camera and two laser modules. One laser module emits a light line beam on the vertical axis. Another laser module emits a light line beam on the tilt horizontal axis. The track of the light line beam on the ground or on the object is captured by the camera, and the image is sent to the notebook computer for calculation. The system can calculate the object width and the distance between the object and the blind in terms of the light line positions on the image. Based on the experiment, the distance between the test object and the blind can be measured with a standard deviation of less than 3% within the range of 60 to 150 cm. The test object width can be measured with a standard deviation of less than 1% within the range of 60 to 150 cm. For saving the power consumption, the laser modules are switched on/off with a trigger pulse. And for reducing the complex computation, the two laser modules are switched on alternately. Besides this, a band pass filter is used to filter out the signal except the specific laser light, which can increase the signal to noise ratio.

Citation Download Citation

Jih-Huah Wu, Jinn-Der Wang, Wei Fang, Yi-Chia Shan, Shih-Hsin Ma, Hai-Ko Kao, Joe-Air Jiang, and Yun-Parn Lee "The application of laser triangulation method on the blind guidance", Proc. SPIE 8133, Dimensional Optical Metrology and Inspection for Practical Applications, 81330V (14 September 2011); https://doi.org/10.1117/12.893000

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