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 = {Tue Mar 16 00:00:00 EST 1993},
month = {Tue Mar 16 00:00:00 EST 1993}
}