The Research On Automatic Measurement Of Settlement And Horizontal Displacement In Reservior Dam

With the rapid development of social economy,the country vigorously the development of water resources for the benefit of mankind,had built a lot of dam projects,so ensure the safe operation of the reservoir dam is very important.At present,small and medium-sized reservoir dam in our country displacement monitoring system mainly uses the "wired" mode,can accurately achieve signal acquisition,data were analyzed offline,anti interference is strong;but it requires a large amount of network wiring,unable to realize the real-time comprehensive analysis of dam structure,operation etc..According to the existing shortcomings,introduces a monitoring method of CMOS imaging technology based on Wireless Sensor Network,can observing the dam displacement in real time.It uses the laser image detection method,laser collimator is fixed on the end away from the dam,many multiple monitoring points are fixed on the dam,through the light sensor(CMOS)gathering spot image,image processing to get the spot center coordinates,calculate the actual displacement,the data is transmitted to the monitor center through the wireless network,real-time analysis and storage.This method has the advantage of high efficiency,low cost,integration,can make up for the shortcomings of the wired network sensor.This paper mainly research the wireless network monitoring system hardware of image acquisition module,image processing module and the software module development,further research the laser spot image processing algorithm.When the environment with strong interference factors,the traditional algorithm of spot image,often has some scattered spots or edge detection is not complete,even resulting in serious deviation of spot center location.Combined with the traditional method,design a kind of target spot center location algorithm baed on differential operation.Firstly collects a plurality of image background and objectives,respectively median trement,and get the background image corresponding(no spot) and the target image(spot),after Differential Operational noise removing,and get the image clear objectives and identify the spot,at the same time,median filtering and morphological opening and closing operation to filter out the noise,enhance anti jamming algorithm;calculate the reasonable gradient operator,for the spot center positioning combined with the circle fitting calculation method to improve the accuracy.Through experiment,the laser spot image acquisition capture center point respectively use the center of gravity method and the method of circle fitting in the interference environment,proving the improved algorithm has higher precision after the analyzing data.Based on the wireless network and CMOS image processing technology of displacement measurement method,it has the steady,quickly,accurate,simple operation etc.,it can monitor the vertical displacement and horizontal displacement of dam at the same time and make up the lack of manual measurement,it is a new kind of dam displacement monitoring method.