We demonstrate a fiber-optic magnetic field sensor based on a micro-optical resonator. The optical resonator is formed by nanocrystals-incorporated PDMS (Ni-PDMS) microsphere. The external magnetic field sets up a body force within the microsphere and a magnetic pressure acting on its surface. The experimental results show that the sensitivity of the 170-μm-diameter microsphere (the ferromagnetic particle mass fraction is 10%) is 20 pm/mT, and gradually tends to be saturated in the magnetic field range of 0 ~ 15 mT.
KEYWORDS: Magnetism, Magnetic sensors, Sensors, Ferromagnetics, Polymers, Nanocrystals, Manganese, Single mode fibers, Reflectivity, Temperature metrology
In this paper, a three-beam Fabry-Perot interferometric senor for magnetic field and temperature measurement is proposed, which is based on a polymer capped on the cleaved end of a single mode fiber and another SMF is aligned with it. The employed polymer is polydimethylsiloxane (PDMS) incorporated with ferromagnetic nanocrystals (Mn3O4). The proposed structure is compact and easy to fabricate, which can improve the sensitivity. The measured sensitivity of magnetic field is -560 pm/mT around 1550 nm. The proposed sensor possesses the following potential applications, such as petroleum survey, electric power industry, biomedicine, aerospace engineering and other fields.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.