NASA Logo, External Link
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed AddThis share icon
 

Record Details

Record 1 of 4785
A magnetostatic-coupling based remote query sensor for environmental monitoring
External Online Source: doi:10.1088/0022-3727/32/12/308
Author and Affiliation:
Grimes, C. A.(The University of Kentucky, Department of Electrical Engineering, Lexington, KY 40506, United States)
Stoyanov, P. G.
Liu, Y.
Tong, C.
Ong, K. G.
Loiselle, K.
Shaw, M.
Doherty, S. A.
Seitz, W. R.
Abstract: A new type of in situ, remotely monitored magnetism-based sensor is presented that is comprised of an array of magnetically soft, magnetostatically-coupled ferromagnetic thin-film elements or particles combined with a chemically responsive material that swells or shrinks in response to the analyte of interest. As the chemically responsive material changes size the distance between the ferromagnetic elements changes, altering the inter-element magnetostatic coupling. This in turn changes the coercive force of the sensor, the amplitude of the voltage spikes detected in nearby pick-up coils upon magnetization reversal and the number of higher-order harmonics generated by the flux reversal. Since the sensor is monitored through changes in magnetic flux, no physical connections such as wires or cables are needed to obtain sensor information, nor is line of sight alignment required as with laser telemetry; the sensors can be detected from within sealed, opaque or thin metallic enclosures.
Publication Date: Jan 01, 1999
Document ID:
20040088366
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Journal of physics D: Applied physics (ISSN 0022-3727); Volume 32; 12; 1329-35
Publisher Information: United Kingdom
Contract/Grant/Task Num: ECS9-701733; 1-R21-GM057240-01; EPS-9452895; NAG5-4594
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt MD United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ENVIRONMENTAL MONITORING; GLUCOSE; MAGNETIC PROPERTIES; MAGNETOSTATICS; POLYMERS; REMOTE SENSORS; HUMIDITY; ION CONCENTRATION; IRON COMPOUNDS; NICKEL; TIME DEPENDENCE
Other Descriptors: BIOSENSING TECHNIQUES/INSTRUMENTATION; ENVIRONMENTAL MONITORING/INSTRUMENTATION; GLUCOSE/ANALYSIS; MAGNETICS; POLYMERS; EQUIPMENT DESIGN; FERRIC COMPOUNDS; HUMIDITY; HYDROGEN-ION CONCENTRATION; NICKEL; SUPPORT, U.S. GOV'T, NON-P.H.S; SUPPORT, U.S. GOV'T, P.H.S; TIME FACTORS; NASA DISCIPLINE LIFE SCIENCES TECHNOLOGIES; NON-NASA CENTER
Availability Source: Other Sources
› Back to Top
NASA Logo, External Link
NASA Official: Gerald Steeman
Site Curator: STI Program
Last Modified: August 23, 2011
Contact Us