Title :
Remotely interrogated temperature sensors based on magnetic materials
Author :
Fletcher, Richard R. ; Gershenfeld, Neil A.
Author_Institution :
Media Lab., MIT, Cambridge, MA, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
A family of remotely interrogated passive temperature sensors is presented. These sensors are comprised of several layers of magnetic materials having either a resonant frequency or harmonic spectrum which varies with temperature. By incorporating a magnetic bias layer and a magnetically permeable layer, it is possible to create sensors which respond to a temperature threshold (reversibly or nonreversibly) or produce a signal which continuously and monotonically varies with temperature. In this paper, a 30%/70% Ni-Fe layer was used in conjunction with amorphous alloy strips to produce three distinct types of wireless temperature sensors operating over the range 20°-70°C
Keywords :
amorphous magnetic materials; cobalt alloys; ferromagnetic materials; iron alloys; magnetic multilayers; magnetic sensors; nickel alloys; temperature sensors; 20 to 70 degC; FeNiCoBSi-NiFe; amorphous alloy strips; harmonic spectrum; magnetic bias layer; magnetically permeable layer; passive temperature sensors; remotely interrogated temperature sensors; resonant frequency; temperature threshold; wireless temperature sensors; Amorphous magnetic materials; Amorphous materials; Magnetic materials; Magnetic resonance; Magnetic sensors; Soft magnetic materials; Temperature dependence; Temperature distribution; Temperature sensors; Wireless sensor networks;
Journal_Title :
Magnetics, IEEE Transactions on
