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Haiying Huang - One of the best experts on this subject based on the ideXlab platform.

  • Compact optical fiber whitelight interferometric Distance Sensor for arbitrary small Distance measurement
    Applied Optics, 2009
    Co-Authors: Ayan Majumdar, Haiying Huang
    Abstract:

    A compact optical fiber Distance Sensor that is capable of measuring arbitrary small Distance is produced by fabricating a microsized polymer core at the end of a single mode fiber. The polymer core introduces an additional reflective interface to a conventional Fabry-Perot cavity. As such, sufficient fringes are presented in the whitelight reflectance spectrum of the Distance Sensor so that arbitrary small Distances can be demodulated using the Fourier transformation technique. The performance of the Distance Sensor is verified experimentally.

  • Development of an in-fiber whitelight interferometric Distance Sensor for small Distance measurement
    Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2008, 2008
    Co-Authors: Ayan Majumdar, Haiying Huang
    Abstract:

    The development of an in-fiber whitelight interferometric Distance Sensor based on the mode coupling effect of a Long Period Fiber Grating (LPFG) for absolute Distance measurement has been investigated. Unlike the Fabry-Perot interferometric Distance Sensor that uses a regular single mode fiber as the Sensor probe, the LPFG-based Distance Sensor employs a single mode fiber whose cladding region is coated with a reflective film and having a LPFG located at a Distance from the cleaved fiber end. The LPFG serves as a beam splitter that separates the light into a core mode and a cladding mode and recombines the two light waves to generate interference, from which the absolute Distance can be deducted. Because the optical path difference of the LPFG-based interferometric Distance Sensor is contributed by both the free-space cavity Distance and the Distance between the LPFG and the fiber end, it does not impose a limit on the minimum measurable Distance. In this paper, the experimental setup for mechanically inducing LPFG in the optical fiber is first described. It is demonstrated that the transmission characteristics of the LPFG can be easily controlled by adjusting the grating period and the applied pressure. The implementation and data analysis of an LPFG-based whitelight interferometric Distance Sensor are then discussed in detail. Experimental results verified that the Distance Sensor is capable of measuring small Distances that can not be measured by a Fabry-Perot interferometric Distance Sensor.

  • Simulation, implementation, and analysis of an optical fiber bundle Distance Sensor with single mode illumination
    Applied Optics, 2008
    Co-Authors: Haiying Huang, Uday Tata
    Abstract:

    A simulation model for an optical fiber bundle Distance Sensor with a single mode fiber as the illumination fiber and a multimode fiber as the receiving fiber is presented. Approximating the illumination light exiting the single mode fiber as having a Gaussian intensity profile, a closed-form solution of the reflected light coupled into the receiving fiber was derived. A Distance Sensor was implemented and the measured Sensor outputs were compared with the simulation data to verify the theoretical model. The performance of the Distance Sensor with different design parameters was analyzed. Design guidelines for achieving desired Sensor performances are suggested.

  • Development of an in-fiber white-light interferometric Distance Sensor for absolute measurement of arbitrary small Distances
    Applied Optics, 2008
    Co-Authors: Amlan Majumdar, Haiying Huang
    Abstract:

    The fabrication, implementation, and evaluation of an in-fiber white-light interferometric Distance Sensor that is capable of measuring the absolute value of an arbitrary small Distance are presented. Taking advantage of the mode-coupling effect of a long-period fiber grating, an additional cavity Distance is added to the optical path difference of the Distance Sensor; therefore, it can generate a sufficient number of fringes for Distance demodulation even if the free-space cavity Distance is very small. It is experimentally verified that the Distance Sensor is capable of measuring small Distances that are beyond the capability of a Fabry-Perot interferometric Distance Sensor.

  • Fabrication and evaluation of a LPFG-based whitelight interferometric Distance Sensor
    Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2007, 2007
    Co-Authors: Haiying Huang, Ayan Majumdar
    Abstract:

    Optical fiber whitelight interferometers for Distance measurement have attracted a lot of attention recently because they offer absolute measurement, ultrahigh accuracy, large dynamic range, and robustness. In this paper, the development of an in-fiber whitelight interferometric Distance Sensor based on the mode coupling effect of a long period fiber grating (LPFG) is presented. Unlike the Fabry-Perot interferometric (FPI) Distance Sensor that has a minimum requirement on the measurable Distance, the LPFG-based Distance Sensor can measure a Distance that is as small as several nanometers. Therefore, it can be applied for near-field surface profiling of micro/nano-sized components. The principle of operation of the LPFG-based Distance Sensor is first explained and an innovative micro-photolithographic technique to fabricate the Sensor probe is described in detail. The performance of the Distance Sensors using two different types of LPFGs, laser-machined LPFG and mechanically induced LPFG, were evaluated and the experimental results are presented.

Kaneo Mohri - One of the best experts on this subject based on the ideXlab platform.

  • Distance Sensors Using Domain Wall Propagation Driven by a Wire Current Pulse Train in Amorphous Magnetostrictive Wires
    IEEE Translation Journal on Magnetics in Japan, 1994
    Co-Authors: M. Mizutani, L.v. Panina, Kaneo Mohri
    Abstract:

    A new Distance Sensor described in this paper uses stepwise propagation of a domain wall by a pulse wire current train in a twisted magnetostrictive amorphous wire. A Distance Sensor of simple construction and with a length of 1000 mm was obtained. The Sensor characteristics are controlled by applying torsion, and a suitable amount of torsion, with minimal nonlinearity, was identified. To improve the resolution of the Sensor while preserving the good linearity, we tried changing the pulse shape of the driving current by adding a bias current to the pulse train current. A digital type Distance Sensor with a resolution of about 1 mm and nonlinearity of about 1% over the length of the 1000 mm long wire was achieved.

  • Distance Sensors Utilizing a Current-Exciting Large Barkhausen Effect in Twisted Amorphous Magnetostrictive Wires
    IEEE Translation Journal on Magnetics in Japan, 1994
    Co-Authors: M. Mizutani, L.v. Panina, H. Katoh, Tsuyoshi Uchiyama, Kaneo Mohri
    Abstract:

    A Distance Sensor which uses the large Barkhausen effect in amorphous wires magnetized by a current is described. A helical anisotropy is created in an Fe 77.5 Si 7.5 B 15 amorphous wire (cold-drawn and then tension-annealed) by applying torsion, and consequently the wire can be magnetized by the circumferential magnetic field created by the wire current. This type of Distance Sensor does not require a long exciting solenoid coil, and its construction is simple. The characteristics of the Sensor are controlled by the number of turns used to apply the torsion. The smallest deviation from linearity, ?=0.4%/FS for a 1000 mm long wire, was obtained when the torsion was 10 turns/m. Domain wall motion in a twisted amorphous wire was also analyzed. The domain wall velocity increases linearly with the wire current, and its mobility decreases with increasing torsion.

  • Distance Sensors utilizing large Barkhausen effect excited by wire current pulse train in twisted amorphous magnetostrictive wires
    IEEE Transactions on Magnetics, 1993
    Co-Authors: M. Mizutani, L.v. Panina, Kaneo Mohri, H. Katoh, F.b. Humphrey
    Abstract:

    A new Distance Sensor utilizing stepwise domain wall propagation caused by a pulse wire current train in a twisted magnetostrictive amorphous wire is presented. A 1000-mm long digital Distance Sensor having a nonlinearity of 0.5% FS and a simple construction is realized. The Sensor characteristics are controlled by applying torsion. The stepwise domain wall propagation characteristics are compared with those for a steady state domain wall propagation. >

M. Mizutani - One of the best experts on this subject based on the ideXlab platform.

  • Distance Sensors Using Domain Wall Propagation Driven by a Wire Current Pulse Train in Amorphous Magnetostrictive Wires
    IEEE Translation Journal on Magnetics in Japan, 1994
    Co-Authors: M. Mizutani, L.v. Panina, Kaneo Mohri
    Abstract:

    A new Distance Sensor described in this paper uses stepwise propagation of a domain wall by a pulse wire current train in a twisted magnetostrictive amorphous wire. A Distance Sensor of simple construction and with a length of 1000 mm was obtained. The Sensor characteristics are controlled by applying torsion, and a suitable amount of torsion, with minimal nonlinearity, was identified. To improve the resolution of the Sensor while preserving the good linearity, we tried changing the pulse shape of the driving current by adding a bias current to the pulse train current. A digital type Distance Sensor with a resolution of about 1 mm and nonlinearity of about 1% over the length of the 1000 mm long wire was achieved.

  • Distance Sensors Utilizing a Current-Exciting Large Barkhausen Effect in Twisted Amorphous Magnetostrictive Wires
    IEEE Translation Journal on Magnetics in Japan, 1994
    Co-Authors: M. Mizutani, L.v. Panina, H. Katoh, Tsuyoshi Uchiyama, Kaneo Mohri
    Abstract:

    A Distance Sensor which uses the large Barkhausen effect in amorphous wires magnetized by a current is described. A helical anisotropy is created in an Fe 77.5 Si 7.5 B 15 amorphous wire (cold-drawn and then tension-annealed) by applying torsion, and consequently the wire can be magnetized by the circumferential magnetic field created by the wire current. This type of Distance Sensor does not require a long exciting solenoid coil, and its construction is simple. The characteristics of the Sensor are controlled by the number of turns used to apply the torsion. The smallest deviation from linearity, ?=0.4%/FS for a 1000 mm long wire, was obtained when the torsion was 10 turns/m. Domain wall motion in a twisted amorphous wire was also analyzed. The domain wall velocity increases linearly with the wire current, and its mobility decreases with increasing torsion.

  • Distance Sensors utilizing large Barkhausen effect excited by wire current pulse train in twisted amorphous magnetostrictive wires
    IEEE Transactions on Magnetics, 1993
    Co-Authors: M. Mizutani, L.v. Panina, Kaneo Mohri, H. Katoh, F.b. Humphrey
    Abstract:

    A new Distance Sensor utilizing stepwise domain wall propagation caused by a pulse wire current train in a twisted magnetostrictive amorphous wire is presented. A 1000-mm long digital Distance Sensor having a nonlinearity of 0.5% FS and a simple construction is realized. The Sensor characteristics are controlled by applying torsion. The stepwise domain wall propagation characteristics are compared with those for a steady state domain wall propagation. >

L.v. Panina - One of the best experts on this subject based on the ideXlab platform.

  • Distance Sensors Using Domain Wall Propagation Driven by a Wire Current Pulse Train in Amorphous Magnetostrictive Wires
    IEEE Translation Journal on Magnetics in Japan, 1994
    Co-Authors: M. Mizutani, L.v. Panina, Kaneo Mohri
    Abstract:

    A new Distance Sensor described in this paper uses stepwise propagation of a domain wall by a pulse wire current train in a twisted magnetostrictive amorphous wire. A Distance Sensor of simple construction and with a length of 1000 mm was obtained. The Sensor characteristics are controlled by applying torsion, and a suitable amount of torsion, with minimal nonlinearity, was identified. To improve the resolution of the Sensor while preserving the good linearity, we tried changing the pulse shape of the driving current by adding a bias current to the pulse train current. A digital type Distance Sensor with a resolution of about 1 mm and nonlinearity of about 1% over the length of the 1000 mm long wire was achieved.

  • Distance Sensors Utilizing a Current-Exciting Large Barkhausen Effect in Twisted Amorphous Magnetostrictive Wires
    IEEE Translation Journal on Magnetics in Japan, 1994
    Co-Authors: M. Mizutani, L.v. Panina, H. Katoh, Tsuyoshi Uchiyama, Kaneo Mohri
    Abstract:

    A Distance Sensor which uses the large Barkhausen effect in amorphous wires magnetized by a current is described. A helical anisotropy is created in an Fe 77.5 Si 7.5 B 15 amorphous wire (cold-drawn and then tension-annealed) by applying torsion, and consequently the wire can be magnetized by the circumferential magnetic field created by the wire current. This type of Distance Sensor does not require a long exciting solenoid coil, and its construction is simple. The characteristics of the Sensor are controlled by the number of turns used to apply the torsion. The smallest deviation from linearity, ?=0.4%/FS for a 1000 mm long wire, was obtained when the torsion was 10 turns/m. Domain wall motion in a twisted amorphous wire was also analyzed. The domain wall velocity increases linearly with the wire current, and its mobility decreases with increasing torsion.

  • Distance Sensors utilizing large Barkhausen effect excited by wire current pulse train in twisted amorphous magnetostrictive wires
    IEEE Transactions on Magnetics, 1993
    Co-Authors: M. Mizutani, L.v. Panina, Kaneo Mohri, H. Katoh, F.b. Humphrey
    Abstract:

    A new Distance Sensor utilizing stepwise domain wall propagation caused by a pulse wire current train in a twisted magnetostrictive amorphous wire is presented. A 1000-mm long digital Distance Sensor having a nonlinearity of 0.5% FS and a simple construction is realized. The Sensor characteristics are controlled by applying torsion. The stepwise domain wall propagation characteristics are compared with those for a steady state domain wall propagation. >

Ayan Majumdar - One of the best experts on this subject based on the ideXlab platform.

  • Compact optical fiber whitelight interferometric Distance Sensor for arbitrary small Distance measurement
    Applied Optics, 2009
    Co-Authors: Ayan Majumdar, Haiying Huang
    Abstract:

    A compact optical fiber Distance Sensor that is capable of measuring arbitrary small Distance is produced by fabricating a microsized polymer core at the end of a single mode fiber. The polymer core introduces an additional reflective interface to a conventional Fabry-Perot cavity. As such, sufficient fringes are presented in the whitelight reflectance spectrum of the Distance Sensor so that arbitrary small Distances can be demodulated using the Fourier transformation technique. The performance of the Distance Sensor is verified experimentally.

  • Development of an in-fiber whitelight interferometric Distance Sensor for small Distance measurement
    Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2008, 2008
    Co-Authors: Ayan Majumdar, Haiying Huang
    Abstract:

    The development of an in-fiber whitelight interferometric Distance Sensor based on the mode coupling effect of a Long Period Fiber Grating (LPFG) for absolute Distance measurement has been investigated. Unlike the Fabry-Perot interferometric Distance Sensor that uses a regular single mode fiber as the Sensor probe, the LPFG-based Distance Sensor employs a single mode fiber whose cladding region is coated with a reflective film and having a LPFG located at a Distance from the cleaved fiber end. The LPFG serves as a beam splitter that separates the light into a core mode and a cladding mode and recombines the two light waves to generate interference, from which the absolute Distance can be deducted. Because the optical path difference of the LPFG-based interferometric Distance Sensor is contributed by both the free-space cavity Distance and the Distance between the LPFG and the fiber end, it does not impose a limit on the minimum measurable Distance. In this paper, the experimental setup for mechanically inducing LPFG in the optical fiber is first described. It is demonstrated that the transmission characteristics of the LPFG can be easily controlled by adjusting the grating period and the applied pressure. The implementation and data analysis of an LPFG-based whitelight interferometric Distance Sensor are then discussed in detail. Experimental results verified that the Distance Sensor is capable of measuring small Distances that can not be measured by a Fabry-Perot interferometric Distance Sensor.

  • Fabrication and evaluation of a LPFG-based whitelight interferometric Distance Sensor
    Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems 2007, 2007
    Co-Authors: Haiying Huang, Ayan Majumdar
    Abstract:

    Optical fiber whitelight interferometers for Distance measurement have attracted a lot of attention recently because they offer absolute measurement, ultrahigh accuracy, large dynamic range, and robustness. In this paper, the development of an in-fiber whitelight interferometric Distance Sensor based on the mode coupling effect of a long period fiber grating (LPFG) is presented. Unlike the Fabry-Perot interferometric (FPI) Distance Sensor that has a minimum requirement on the measurable Distance, the LPFG-based Distance Sensor can measure a Distance that is as small as several nanometers. Therefore, it can be applied for near-field surface profiling of micro/nano-sized components. The principle of operation of the LPFG-based Distance Sensor is first explained and an innovative micro-photolithographic technique to fabricate the Sensor probe is described in detail. The performance of the Distance Sensors using two different types of LPFGs, laser-machined LPFG and mechanically induced LPFG, were evaluated and the experimental results are presented.