Low Frequency Noise of Anisotropic Magnetoresistors in AC-excited Magnetometers
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F12%3A00194968" target="_blank" >RIV/68407700:21230/12:00194968 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Low Frequency Noise of Anisotropic Magnetoresistors in AC-excited Magnetometers
Original language description
Magnetoresistors can replace induction sensors in applications like nondestructive testing and metal detection, where high spatial resolution or low frequency response is required. Using an AC excitation field the magnetic response of eddy currents is detected. Although giant magnetoresistive (GMR) sensors have higher measuring range and sensitivity compared to anisotropic magnetoresistors (AMR), they show also higher hysteresis and noise especially at low frequencies. Therefore AMR sensors are chosen to be evaluated in low noise measurements with combined processing of DC and AC excitation field with respect to the arrangement of processing electronics. Circuit with a commercial AMR sensor HMC1001 and AD8429 preamplifier has the noise of 125 pT/rtHz at 1 Hz using the flipping technique. Without the flipping, the noise combined with the 1/f noise of the amplifier results in 246 pT/rtHz at 1 Hz.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
JB - Sensors, detecting elements, measurement and regulation
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GD102%2F09%2FH082" target="_blank" >GD102/09/H082: Sensors and intelligent sensor systems</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů