TY - JOUR N2 - Ice thickness is one of the most critical physical indicators in the ice science and engineering. It is therefore very necessary to develop in-situ automatic observation technologies of ice thickness. This paper proposes the principle of three new technologies of in-situ automatic observations of sea ice thickness and provides the findings of laboratory applications. The results show that the in-situ observation accuracy of the monitor apparatus based on the Magnetostrictive Delay Line (MDL) principle can reach ±2 mm, which has solved the “bottleneck” problem of restricting the fine development of a sea ice thermodynamic model, and the resistance accuracy of monitor apparatus with temperature gradient can reach the centimeter level and research the ice and snow substance balance by automatically measuring the glacier surface ice and snow change. The measurement accuracy of the capacitive sensor for ice thickness can also reach ±4 mm and the capacitive sensor is of the potential for automatic monitoring the water level under the ice and the ice formation and development process in water. Such three new technologies can meet different needs of fixed-point ice thickness observation and realize the simultaneous measurement in order to accurately judge the ice thickness. L1 - http://www.journals.pan.pl/Content/89981/PDF/Journal10178-VolumeXIXIssue3_15.pdf L2 - http://www.journals.pan.pl/Content/89981 PY - 2012 IS - No 3 EP - 592 DO - 10.2478/v10178-012-0051-6 KW - ice thickness KW - observation KW - MDL KW - resistance KW - capacitive induction. A1 - Yinke Dou A1 - Xiaomin Chang PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2012 T1 - In-situ automatic observations of ice thickness of seas SP - 583 UR - http://www.journals.pan.pl/dlibra/publication/edition/89981 T2 - Metrology and Measurement Systems ER -