Coaxial probe for high temperature and high pressure applications

Patent 6642807 Issued on November 4, 2003. Estimated Expiration Date:

April 29, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor: Eason

Inventor

Gard, Alan Moravec

Application

No. 10/134885 filed on 04/29/2002

US Classes:

333/24R, COUPLING NETWORKS333/245, LONG LINE ELEMENTS AND COMPONENTS73/866.5PROBE OR PROBE MOUNTING

Examiners

Primary: Callahan, Timothy P.
Assistant: Luu, An T.

Attorney, Agent or Firm

Wood, Phillips, Katz, Clark & Mortimer

International Classes

G01F 23/284 (20060101)
G01F 23/26 (20060101)
G01F 23/22 (20060101)
H01Q 13/08 (20060101)
H01Q 9/00 (20060101)
G01S 13/88 (20060101)
G01S 13/00 (20060101)
G01S 7/03 (20060101)

Abstract

A guided wave radar probe defines 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 includes a center conductor for conducting the pulses. A conductive outer sleeve is coaxial with the center conductor. The conductive outer sleeve has a process end and a connector end. The process end is exposed, in use, to a process environment being measured. A first cylindrical seal element between the center conductor and the outer sleeve is at the sleeve process end. The first cylindrical seal element is of a first material adapted to withstand a relatively high temperature. A second cylindrical seal element is between the center conductor and the outer sleeve disposed between the first cylindrical seal element and the connector end. The second cylindrical seal element is of a second material adapted to withstand a lower temperature than the first cylindrical seal element.