The Application Research Of Ice Detecting Based On The Characteristic Difference Of Resistance And Temperature Among Air, Water And Ice

This paper is an application foundation research which is aided by the item of national natural science fund "the research of the ice layer thickness sensor and its detecting method" (60672028). The ice layer thickness sensor based on the difference of resistance value among air> water and ice has been actually used in the 21st and the 22nd Chinese Antarctic Scientific Expedition. After analyzing a great deal of data which is obtained in the course of detecting Antarctic sea ice, we discover that the method using the difference of resistance value to measure sea ice thickness is comparatively precise in judging air-ice interface, but has some error in judging ice-water interface. Based on this result, the author of this paper proposed a new detecting method that using the characteristic difference of resistance and temperature to detect ice thickness, this new method is helpful to improve the precision of judging ice-water interface. At the same time, when the discrepancy of ice temperature and air temperature is comparatively wide, we can use the difference of temperature to judge air-ice interface, so the new method can improve the precision of judging above interface and realize multi-parameter detection. From the data obtained, we can analyze ice thickness, water level under ice and ice properties inside, it will help us to forecast ice layer's change trend. So the research of this item has important scientific research value and practical application value.Through analyzing a quantity of earlier experimental data, we find the characteristic difference of resistance and temperature among air, water and ice. It provide us theory base of making sensor. After comparing all kinds of temperature sensors on sale, choose DS18B20 to realize multi-point temperature detecting. It has high precision, small volume, simple circuit, low price and can work under low temperature.We make a lab model which can collect and store data automatically. In this model, we use temperature's change to control collecting and storing data, not time collecting and storing data. The data obtained is more reasonable and more usable. After a lot of lab's low temperature experiments, combining with questions in using, the author analyzed the data deeply. Then, based on the model, we design and make new ice thickness sensor. The new sensor is improved from its shape, material to its structure according to actual working condition. Under similar working circumstance, we do low temperature experiments and acquired large numbers of data. The analysis of experimental data is good for improving sensor's performance.Through multi-parameter (resistance, temperature) detecting, the new ice thickness sensor monitoring system has been actually used in the 24th Chinese Antarctic Scientific Expedition. The precision and reliability of the system has been improved significantly, especially the precision of judging ice-water interface. At the same time, this new method not only provided a new theory, but also supplied a reference model for further research on the ice thickness monitoring system.