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Title: Noninvasive valve monitor using alternating electromagnetic field

Abstract

One or more electrical coils are carefully located on the outside of a valve body. An alternating current passing through the coil(s) results in an alternating electromagnetic field being transmitted into the valve body and valve internals. The electromagnetic field varies in intensity and polarity in the valve. As the position of a valve internal part is changed, the electromagnetic field throughout the valve body and its internals is altered. A passive receiver coil carefully located on the outside of the valve body detects the intensity of the electromagnetic field at that location as an induced electrical voltage in the coil. With the change in position of the valve internal part, there is a corresponding change in the induced voltage as a result of the alteration in the alternating electromagnetic field at that location. Changes in the voltage provide an indication of the position and motion of valve internals.

Inventors:
; ;
Issue Date:
OSTI Identifier:
6213460
Patent Number(s):
5193568
Application Number:
PPN: US 7-718453
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States)
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Resource Relation:
Patent File Date: 20 Jun 1991
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; VALVES; ELECTROMAGNETIC TESTING; ELECTRIC CURRENTS; ELECTROMAGNETIC FIELDS; POSITIONING; CONTROL EQUIPMENT; CURRENTS; EQUIPMENT; FLOW REGULATORS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; TESTING; 420500* - Engineering- Materials Testing

Citation Formats

Eissenberg, D M, Haynes, H D, and Casada, D A. Noninvasive valve monitor using alternating electromagnetic field. United States: N. p., 1993. Web.
Eissenberg, D M, Haynes, H D, & Casada, D A. Noninvasive valve monitor using alternating electromagnetic field. United States.
Eissenberg, D M, Haynes, H D, and Casada, D A. Tue . "Noninvasive valve monitor using alternating electromagnetic field". United States.
@article{osti_6213460,
title = {Noninvasive valve monitor using alternating electromagnetic field},
author = {Eissenberg, D M and Haynes, H D and Casada, D A},
abstractNote = {One or more electrical coils are carefully located on the outside of a valve body. An alternating current passing through the coil(s) results in an alternating electromagnetic field being transmitted into the valve body and valve internals. The electromagnetic field varies in intensity and polarity in the valve. As the position of a valve internal part is changed, the electromagnetic field throughout the valve body and its internals is altered. A passive receiver coil carefully located on the outside of the valve body detects the intensity of the electromagnetic field at that location as an induced electrical voltage in the coil. With the change in position of the valve internal part, there is a corresponding change in the induced voltage as a result of the alteration in the alternating electromagnetic field at that location. Changes in the voltage provide an indication of the position and motion of valve internals.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {3}
}