Apparatus and method for sensing fluid level

Details Apparatus and method for sensing fluid level Apparatus and method for sensing fluid level

1996-06-04

1997-08-12

Bieger, Ronald L.

Measuring and testing

Liquid level or depth gauge

G01F 2300

Patent

active

056567740

ABSTRACT:
A method and apparatus (10) for sensing a surface level (24) of fluid (12) in a tank (14) having an electrically conducting pickup tube (20) extending through a wall (16) of the tank (14) and into the fluid (12) includes a time domain reflectometry circuit (40) connected to the tube (20) for generating an incident pulse (68) that travels down the tube (20) and a portion of which is reflected at the surface (24) as a reflected pulse (70, 72) which travels back along the tube (20) and is sensed by the circuit (40). The circuit (40) utilizes the elapsed time between the generation of the incident pulse (68) and the receipt of the reflected pulse to determine the position of the surface (24) relative to a reference point. The robe (20) forms a transmission line with one of a plate (48), an outer tube (110) and a return tube (130).

REFERENCES:
patent: 3812422 (1974-05-01), De Carolis
patent: 3832900 (1974-09-01), Ross
patent: 3995212 (1976-11-01), Ross
patent: 4359902 (1982-11-01), Lawless
patent: 5457394 (1995-10-01), McEwan
patent: 5457990 (1995-10-01), Oswald et al.

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