基于微電極水膜傳感器的研究
[Abstract]:Because of the bad weather such as rain and snow every year, a large number of casualties are caused, so it is very important to get the weather information of road surface in time. As an important part of road surface sensing system, water film sensor plays a key role, but at present the domestic market is basically monopolized by European and American countries, and the detection technology is also controlled by people. Therefore, the main work of this paper is to study a cheap and practical device for measuring the thickness of water film. In this paper, a contact sensor for measuring the thickness of pavement water film is studied. Based on the conductivity of water and the volt-ampere characteristic of microelectrode, the working model of water film detection is established. In combination with the microelectronic fabrication process, the distance between the microelectrodes was processed to 0.5 mm, and the area of a single detection electrode was 0.2 mm 2 mm. The sensor outputs the water film thickness information in the form of voltage signal, rectifies the AC voltage signal into DC signal through hardware circuit, and then filters and calibrates and amplifies it into A / D acquisition. The driving signal is improved to input the pulse signal of positive and negative alternating 1MHz with zero static DC potential in the common electrode. The corrosion phenomenon of the electrode is improved by reducing the corrosion potential difference between the electrodes and matching the high impedance in the detection of electric extremes to reduce the current. This paper analyzes the instability of measurement data of water film sensor and selects more stable platinum as electrode material through the comparison experiment of electrode material. The collected data are interpolated by interpolation algorithm, and the results are retrieved by the least square method, and the water film thickness with the smallest error is outputted. The error of the water film sensor is controlled within 0.6%, the measuring range of the sensor is 0-80 mm, and the measuring precision is 0.5 mm. Finally, the data of measuring the thickness of water film is displayed through the page of the upper computer, which realizes the effective monitoring and statistical recording of the thickness of liquid film.
【學位授予單位】:南京信息工程大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TP212
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