Process and apparatus to measure the height of a product in a surrounding medium having a different thermal behaviour than that of the product being measured, notably for measuring the height of a layer of snow

摘要

A measuring rod carrying a plurality of temperature sensors distributed over its height is placed in such a way that at least its lower part is embedded in the product of which the height is to be measured. Signals produced by the sensors and representing the temperatures in the locations of the various sensors on the rod are picked up and the variation in time of the picked-up signals is monitored in order to identify the lowest situated sensor which delivers a signal of which the variation is higher than a predetermined threshold.