Application Study of LED Light Source Image on Water Level Measurement
|關鍵字:||易淹水地區水位計;光學三角測距量測法;光學形心法;water level gauge for flood-prone areas;optical triangulation method;centroid method|
本研究設計之試驗儀器，為三角光學式測距水位計。影像擷取鏡頭使用市售價格低廉之網路攝影機，計算部分利用三角測距量測法(Optical Triangulation Method) 結合光學形心法(Centroid Method)，追蹤計算EPS浮板上之光源形心位置及變化量，反推其水位。
This study aims at the development of water level gauge for flood-prone areas. To overcome common level gauges, expensive cost and not being able to applied to flood-prone areas, this research focuses on five directions: low cost of hardware of the instrument, the availability of internal components, the convenience to set up the instrument, high accuracy of measurement, and the potential of development in the future. Optical triangulation water level gauge is designed in this study. Webcam with low price is used to capture the image in this study. The combination of optical triangulation method and centroid method is applied in the calculation. By tracing the position and the variation of the centroid of light source on the EPS kickboard, water level can be deduced. Experiments of water level are divided into static and dynamic parts. In the experiment of static water level, optical triangulation water level gauge was put in the static sink and measured with two different resolutions; measurements for the two resolutions were compared with the actual water level, and the both error were calculated and compared, too. As for dynamic experiment, flux of water was fixed, and the inaccuracy was measured by putting the optical triangulation water level gauge into sinks with different water levels. The measurements were compared with two submersible pressure sensors and another float sensor. Measurement of the triangulation water level gauge reveals that error range of the static water level is smaller than 0.01ft, which is the standard of precision of measurement set by United States Environmental Protection Agency.
|Appears in Collections:||Thesis|
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