초록 ▼

An apparatus and method for measuring the height of a liquid above a reference level in which short pulses of subnanosecond duration are coupled to a dual-mode transmission line immersed in a liquid to propagate thereon in a plurality of modes. A surface wave propagating on the outer conductor is re

An apparatus and method for measuring the height of a liquid above a reference level in which short pulses of subnanosecond duration are coupled to a dual-mode transmission line immersed in a liquid to propagate thereon in a plurality of modes. A surface wave propagating on the outer conductor is reflected from the surface of the liquid, and coaxial-mode propagating within the transmission line is reflected from the reference level. These reflected pulses propagate back along the transmission line, coupled to a receiver for detection, the detected pulses processed to determine the liquid height above a reference level.

대표청구항 ▼

An apparatus for measuring the height of a liquid in a container above a reference level comprising, first transmission line means coupled to receive short pulses for propagation in a first mode, second transmission line means coupled at a first end to said first transmission line, and coupled to si

An apparatus for measuring the height of a liquid in a container above a reference level comprising, first transmission line means coupled to receive short pulses for propagation in a first mode, second transmission line means coupled at a first end to said first transmission line, and coupled to signal reflecting means at a second end at the bottom of the container, said second transmission line means having an inner conductor and an outer conductor with inner and outer surfaces, for propagating pulsed signals therealong, means for launching short pulses in a second mode between said inner conductor and said inner surface of said outer conductor and for launching short pulses in said first mode to said outer surface of said outer conductor whereby: pulses in said first mode propagating on said outer surface of said outer conductor are reflected from said surface of said liquid and short pulses in said second mode propagating between said inner conductor and said inner surface of said outer conductor are reflected from said signal reflecting means, means for coupling said first mode reflected pulses and said second mode reflected pulses from said second transmission line means to said first transmission line means in said first mode for propagation therealong, receiver means coupled to said first transmission line for detecting said reflected pulses and for determining said liquid level therefrom.