Please use this identifier to cite or link to this item: http://rportal.lib.ntnu.edu.tw:80/handle/77345300/32045
Title: Image-based height measuring systems for liquid or particles in tanks
Authors: 國立臺灣師範大學電機工程學系
M.-C. Lu
W.-Y. Wang
H.-H. Lan
Issue Date: 23-Mar-2004
Abstract: In this paper, an image-based height measuring system for liquid or particulate material, which does not use pixels to measure distance, is proposed to measure the material height inside of a storage tank. Two laser projectors, fixed on a base, define a vertical plane to produce two projected bright spots on the surface of the material in the tank. A timer, instead of pixel counter, for measuring distance and a circuit for counting the number of clock pulses between the two bright spots are employed to calculate the distance between the two projected bright spots in the video images. Since the two laser projectors form an isosceles triangle, there is a simple relationship between the actual measured height and the distance of the two bright spots. The actual height of liquid in the tank can be calculated from a simple formula. One does not have to use a expensive high speed DSP microprocessor to identify the bright spots, but just use a simple voltage comparator to identify them. Experimental results have demonstrated the effectiveness of the proposed system.
URI: http://rportal.lib.ntnu.edu.tw/handle/77345300/32045
Other Identifiers: ntnulib_tp_E0604_02_068
Appears in Collections:教師著作

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