Ice thickness is one of the most critical physical indicators in the ice science and ice engineering research, and it is very necessary to research the in-situ automatic observation technologies of the ice thickness. This paper has introduced the principle of three new technologies of in-situ sea ice thickness automatic observation and provided the findings of its in-situ or laboratory application study. Such three new technologies of ice thickness observation can meet different needs of fixed-point ice thickness observation and realize the simultaneous measurement in order to accurately judge the ice thickness.
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