Application of ARM Microcontroller in Ultrasonic Measurements for Suspended Sediment Concentrations
Date Issued
2014
Date
2014
Author(s)
Yen, Hui-Chia
Abstract
Because the rivers in Taiwan are short and steep, the great amount of sediment which scours through the rivers cause environmental disasters during the torrential rain season. Therefore, the suspended sediment concentration is the most important information for hydrological characteristics. Among of many methods used to measure suspended sediment concentrations, the bottle sampling is the most accurate method. However, time-consuming, working space limitation and non-continuous recording are disadvantages of the bottle sampling method. As the result, the development of the suspended sediment concentration measurement is the purpose of this study. ARM microcontroller is used to control the operation of the system to improve the performance of the sediment distribution monitoring and estimation of sediment concentration. Experiments were carried out by using two transducers with the operation frequency of 1 MHz. The distance between two transducers was set at 20 cm. A microcontroller was used to synchronize the transmitter and receiver, and the user interface was also developed to start the system, display and store the measured data. The relationship of the signal attenuation in dB scale and
concentration was established. Therefore, the concentrations could be determined by the measured signal attenuation. Experimental results show the concentration range from 0 mg/L to 450,000 mg/L can be determined and the measurement error can also be reduced to less than 6%. In addition, there is no significant impact on the measured data at different temperatures. Therefore, the proposed technique successfully detects suspended sediment concentration.
Subjects
泥砂濃度
超音波
超音波衰減法
ARM 微控制器
人機介面
Type
thesis
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