Guided wave radar probe reference target
AssigneeMagnetrol International, Incorporated
InventorPaul G. Janitch
Life of this patent
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Abstract
A probe defining a transmission line is used with a measurement instrument including a pulse circuit connected to the probe for generating pulses on the transmission line and receiving reflected pulses on the transmission line. The probe comprises an adapter for mounting to a process vessel. A conductive outer sleeve is secured to the adapter. A center conductor is coaxial with the outer sleeve for conducting the pulses. The conductive outer sleeve has a connector end proximate the adapter and a distal end to extend into a processed liquid. The outer sleeve has a geometric discontinuity defining a referenced target producing an impedance change at a position between the adapter and the distal end at a location in a process vapor region above a processed liquid.
Claims20
A probe defining a transmission line for use with a measurement instrument including a pulse circuit connected to the probe for generating pulses on the transmission line and receiving reflected pulses on the transmission line, the probe comprising:
- an adapter for mounting to a process vessel;
- a conductive outer sleeve secured to the adapter;
- and a center conductor coaxial with the outer sleeve for conducting the pulses, the conductive outer sleeve having a connector end proximate the adapter and a distal end to extend into a process liquid, the outer sleeve having a geometric discontinuity defining a reference target producing an impedance change at a position between the adapter and the distal end at a location in a process vapor region above a process liquid.
A probe defining a transmission line for use with a measurement instrument including a pulse circuit connected to the probe for generating pulses on the transmission line and receiving reflected pulses on the transmission line, the probe comprising:
- a connector for electrical connection to the pulse circuit;
- a conductive outer sleeve secured at a connector end to the connector and having a distal end to extend into a process liquid;
- and a center conductor coaxial with the outer sleeve for conducting the pulses, the outer sleeve having a geometric discontinuity defining a reference target producing an impedance change at a position between the connector end and the distal end at a location in a process vapor region above a process liquid.
A probe defining a transmission line for use with a measurement instrument including a pulse circuit connected to the probe for generating pulses on the transmission line and receiving reflected pulses on the transmission line, the probe comprising:
- a connector for electrical connection to the pulse circuit;
- a conductive outer sleeve secured at a connector end to the connector and having a distal end to extend into a process liquid;
- and a center conductor coaxial with the outer sleeve for conducting the pulses, the probe having a reference target producing an impedance change at a position between the connector end and the distal end at a location in a process vapor region above a process liquid, wherein any reflected pulse at the reference target location has an opposite polarity to a process liquid reflected pulse at the process liquid level.
Dependencies are inferred from the claim text.