Results 221 to 230 of about 60,127 (297)

In-Fiber Bragg-Grating Sensors

Optical Fiber Sensors, 1988
In 1978. K. O. Hill and colleagues1 reported the formation of refractive index gratings in germanosilicate core, silica clad fibers by injection of 488 and 514.5 nm argon-ion laser radiation into one end of the core. A few years later, Lam and Garside2 showed the grating strength increased as the square of the power flux, suggesting a two-photon ...
G. Meltz, W. W. Morey, W. H. Glenn, J. D. Farina   +3 more
openaire   +1 more source

Temperature-insensitive fiber Bragg grating tilt sensor

Applied Optics, 2008
A temperature-insensitive optical fiber tilt sensor is presented. The sensor scheme uses a prestrained fiber Bragg grating to sense the strain, which depends on the tilt angle. To compensate for the temperature effect, materials that have different linear thermal expansion behaviors are used for implementation of the sensor body. The differentiation in
Hsuan-Jen, Chen, Likarn, Wang, W F, Liu
openaire   +2 more sources

Fiber Bragg grating sensor and waveguide grating sensor

SPIE Proceedings, 2011
Several new designes of different type fiber Bragg grating(FBG) sensors, including long range strain sensor, pressure sensor, and displacement sensor, have been introduced. A new concept of sliced fiber Bragg grating as free space optical element has been presented. Some new waveguide Bragg grating writing technologies have been introduced.
openaire   +1 more source

Multiplexing fiber bragg grating sensors

Fiber and Integrated Optics, 1991
Abstract Bragg reflection gratings and out-coupling taps for sensors can be written holographically within the core of many commercial fibers available today. The gratings appear to be permanent and have been tested to temperatures in excess of 500°C.
W. W. Morey, J. R. Dunphy, G. Meltz
openaire   +1 more source

A fiber optic Bragg grating seismic sensor

SPIE Proceedings, 2007
Here we present a fiber optic seismic waves sensor based on in-fiber Bragg gratings. Fiber Bragg Grating sensors have been demonstrated to have very high sensitivity to dynamical strain in the sub-micro-strain range and very extended dynamical response from static to very high frequency. The seismic sensing system is based on the integration of three
A. Laudati, F. Mennella, M. Esposito, CUSANO, ANDREA, M. Giordano, BREGLIO, GIOVANNI, S. Sorge, C. Calisti Tassini, A. Torre, G. D’Altrui, CUTOLO, ANTONELLO   +10 more
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Fiber Bragg grating as ultrasonic wave sensors

SPIE Proceedings, 2004
In this work, the response of fiber Bragg gratings (FBG) subjected to longitudinal ultrasonic (US) field has been theoretically and numerically investigated. US field interaction has been modeled taking into account the direct deformation of the grating pitch combined with changes in local refractive index due to elasto-optic effect.
Minardo A, Cusano A, Bernini R, Zeni L, Giordano, M   +5 more
openaire   +2 more sources

Refractive Index and Temperature Sensor Based on D-Shaped Fiber Combined With a Fiber Bragg Grating

IEEE Sensors Journal, 2019
A novel D-shaped fiber structure combined with a fiber Bragg grating for refractive index (RI) and temperature sensing is proposed and experimentally investigated.
Yue Dong, S. Xiao, Beilei Wu, H. Xiao, S. Jian   +4 more
semanticscholar   +1 more source

Fiber Bragg Grating Magnetic Field Sensor

2006 IEEE Instrumentation and Measurement Technology Conference Proceedings, 2006
In this paper we demonstrate experimentally a magnetic field sensor using a fiber Bragg grating. The shift in the Bragg condition as a result of strain applied on the fiber mounted on a nickel base by the magnetic field gives an indirect measure of the field.
K.V. Madhav, K. Ravi Kumar, T. Srinivas, S. Asokan   +3 more
openaire   +2 more sources

A Novel Miniaturized Fiber Bragg Grating Vibration Sensor

IEEE Sensors Journal, 2019
In order to meet the needs of small space vibration detection, a novel miniaturized fiber Bragg grating (FBG) vibration sensor is proposed. With adopting the hinges and elastic plate as the elastic body, the miniaturization of sensor and suppression of ...
Li Wei, Dazhou Jiang, Lingling Yu, Hengchun Li, Zhuang Liu   +4 more
semanticscholar   +1 more source

Polarimetric heterodyning Bragg-grating fiber-laser sensor

Optics Letters, 1993
We report the operation of an active, single-frequency, polarimetric, Bragg-grating fiber-laser strain sensor. The short Bragg-grating fiber-laser design limited lasing to two orthogonal polarization modes that, when optically mixed, yielded a single beat frequency that varied at a rate of -4.1 MHz/mstrain for linear strain and -0.37 MHz/(deg/cm) for ...
G A, Ball, G, Meltz, W W, Morey
openaire   +2 more sources