Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Geoffrey A. Cranch"'
Autor:
Janet W. Lou, Geoffrey A. Cranch
Publikováno v:
AIP Advances, Vol 10, Iss 10, Pp 105219-105219-11 (2020)
The optical light shift effect is an all-optical technique to create magnetic bias fields to determine the vector components of the magnetic field using a scalar optically pumped magnetometer. We show that the measurement of the induced bias fields i
Externí odkaz:
https://doaj.org/article/9c5da1eac1b74f58a7daa7b6251f8cf3
Autor:
Caitlin R. S. Williams, Meredith N. Hutchinson, Joseph D. Hart, Marriner H. Merrill, Peter Finkel, William R. Pogue III, Geoffrey A. Cranch
Publikováno v:
APL Photonics, Vol 5, Iss 3, Pp 030803-030803-10 (2020)
Detection and location of the source of acoustic emission in a thin aluminum panel is demonstrated using a multichannel fiber laser sensor system. Acoustic emission generated by a crack in an aluminum panel used as a test coupon in an accelerated fat
Externí odkaz:
https://doaj.org/article/62e41de0726a4a089fd156036bd25c16
Autor:
Janet W. Lou, Geoffrey A. Cranch
Publikováno v:
AIP Advances, Vol 8, Iss 2, Pp 025305-025305-8 (2018)
The dephasing time of spin-polarized atoms in an atomic vapor cell plays an important role in determining the stability of vapor-cell clocks as well as the sensitivity of optically-pumped magnetometers. The presence of a buffer gas can extend the lif
Externí odkaz:
https://doaj.org/article/47588b3f39064ec7b2b3bf99e61ab73e
Publikováno v:
Journal of Lightwave Technology. 40:179-190
Calculations involving polarization propagation in dielectric media require the adoption of various, often unstated, conventions, an important one of which is the sign of the complex argument ±i(ωt - βz). In this paper we show that the form of the
Autor:
Caitlin R. S. Williams, Joseph D. Hart, Seth J. Meiselman, Sanjay R. Varma, Janet W. Lou, Charles G. Pelzman, Gary A. Miller, Geoffrey A. Cranch
Publikováno v:
27th International Conference on Optical Fiber Sensors.
Distributed fiber optic strain and temperature measurements are demonstrated on an Expeditionary Fast Transport ship during normal operation for real-time condition monitoring.
Publikováno v:
Optical Fiber Sensors Conference 2020 Special Edition.
A passive detection scheme enabling single fiber remote operation of an optically pumped magnetometer is demonstrated. Polarization analysis occurs at the sensor head, while the Larmor precession frequency is detected after fiber propagation.
Publikováno v:
Optical Fiber Sensors Conference 2020 Special Edition.
We demonstrate a fiber laser sensor used to detect acoustic emissions generated by stress corrosion cracking in sensitized aluminum. Several performance metrics closely match those of industry standard piezo-electric sensors.
Autor:
Geoffrey A. Cranch, Anbo Wang
Publikováno v:
Optical Fiber Sensors Conference 2020 Special Edition.
The 27th International Conference on Optical Fiber Sensors was to be held on June 8th 2020 in Alexandria, Virginia USA. By March of 2019, over 330 papers had been scheduled for presentation with eight invited speakers, two workshops and eight.
Autor:
Janet W. Lou, Geoffrey A. Cranch
Publikováno v:
Applied optics. 59(7)
Atomic vapor magnetometers have demonstrated very high sensitivity to the magnitude of the magnetic field. Vector field measurements are possible using bias fields applied to the vapor. For remote operation, the bias field can be generated using the
Publikováno v:
Optics Express. 29:44300
In distributed strain or temperature sensing applications such as structural health monitoring, optical frequency domain reflectometry (OFDR) is often used to interrogate all-grating fiber (AGF), which consists of many weak, nominally identical Bragg