Method and apparatus for determining a fluid level in the vicinity of a transmission line

摘要

A method and apparatus for detecting fluid level in a tank in the vicinity of a transmission line (1), the fluid level being such as to cause reflection of a signal transmitted along the transmission line. The method includes the steps of: a) transmitting a signal along the transmission line; b) monitoring the transmission line for any reflections of the signal; c) generating an analysis window of time (t1, t2, t3) if the magnitude of a given characteristic of the reflected signal is greater than a predetermined threshold value; and d) analyzing the reflected signal received during the period of an analysis window to provide the required information on the fluid level.