Improvements in time domain reflectometry

Details Improvements in time domain reflectometry Improvements in time domain reflectometry

G - Physics

01

F

G01F 23/284 (2006.01) G01S 13/02 (2006.01) G01S 13/88 (2006.01)

Patent

CA 2286439

A time domain reflectometry method for determining positions of upper and lower interfaces of a first liquid floating on a second liquid within a vessel, using a system includes a probe in the form of a transmission line extending vertically within the vessel from a point above a highest level to be measured of the upper interface to below a lowest level to be measured of the lower interface, and an impulse radar system connected to the upper end of the transmission line, the micro impulse radar system including a microwave pulse generator. The method includes the steps of constructing and installing the transmission line so as to have a pulse response substantially free of internal reflections except at its ends, matching the radar system to the upper end of the probe sufficiently well to avoid the generation of noise or spurious echoes having an amplitude which is comparable to the magnitude of first and second return pulses due to reflections occurring at the upper and lower interfaces, while generating a readily detectable reflection forming a fiducial return pulse marking the end of the probe, and determining the positions of the upper and lower interfaces of the liquid being calculated by determining the time of flight between the fiducial return pulse and the first return pulse and calculating therefrom distance along the probe to the first interface, and determining the time of flight between the first and second return pulses and applying thereto a scaling factor dependent of the dielectric constant of the first liquid so as to determine a distance between the first and second interface. The method is preferably implemented using an MIR system, and sampling of reflected energy is preferably under control of a time base generator whose output delay is linearized by negative feedback.

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