Monday, 19 February 2018 Livable Cities: DBM launches assistance program for developing vibrant and sustainable public open spaces Wednesday, 17 January 2018 DBM conducts forum on execution of 2018 budget and preparation of 2019 budget. Properties dialog box. Under the Power Schemes tab, set both Turn off monitor and Turn off hard disks to Never. Insert the installation CD. Run the Setup.exe file. When Figure 2-1 appears, click Accept.
Conference Chairs., Lumoptix, LLC (United States)., Honeywell Technology (United States)., Columbia Gorge Research LLC (United States) Conference Co-Chairs., Columbia Gorge Research (United States)., Virginia Tech (United States) Program Committee., Weatherford International Ltd. (United States)., Technical Univ.
Of Denmark (Denmark)., BaySpec Inc. (United States)., Optiphase, Inc. (United States)., Univ. Of Pittsburgh (United States)., Univ. Of Strathclyde (United Kingdom). Abdessama Elyamani, Northrop Grumman Navigation Systems (United States)., Univ. Of Michigan (United States).
Yoel Fink, Massachusetts Institute of Technology (United States)., US Sensor Systems, Inc. (United States)., Micron Optics, Inc. (United States)., Univ.
Of Nebraska-Lincoln (United States). Hajime Haneda, National Institute for Materials Science (Japan). Daniel Homa, Virginia Polytechnic Institute and State Univ.
(United States). Grayson will present on “Mosaic Warfare”, DARPA’s strategy for conducting joint multi-domain battle at speed. Instead of focusing on developing new, highly capable platforms, Mosaic Warfare focuses on speed and adaptation; networking sensors; command and control; and effects together across domains to form kill chains that adapt to dynamic threats and environments. Unlike today’s monolithic systems and rigid architectures that take decades to develop, Mosaic Warfare will utilize rapid machine-to-machine interoperability and AI to network manned and unmanned systems together, creating resilient and distributed architectures at campaign, and eventually, mission speeds. Grayson will introduce the audience to this Mosaic Warfare concept, and discuss both key technology enablers and challenges that will need to be addressed to make it a reality.
A distributed sensor based on wavelength-multiplexed sapphire fiber Bragg gratings (FBGs) was designed and fabricated for temperature measurement in commercial boilers under field conditions. The sensor was deployed in an operating commercial boiler.
The tests were performed in a coal-fired boiler, and the signal was recorded and analyzed by an onsite interrogation system in real time. The performance of the sensor was consistent during the entire test duration of 42 days, measuring temperatures up to 700 °C. The system has a demonstrated temperature measurement range from 25 °C to 1200 °C. Optical Frequency Domain Reflectometry (OFDR) is notable for its ability to characterize a fiber distributed reflection profile with high spatial resolution and high sensitivity in a single laser sweep, allowing for the measurement of strain and temperature with millimeter spatial resolution over short ranges (tens of meters up to a few kilometers). We investigate how spatially resolved characterization of the polarization properties of light reflected or transmitted by a fiber can enable additional sensing capabilities, including distributed polarization mode dispersion and polarization extinction measurements, with applications in distributed pressure, electric field, and transverse stress sensing. New developments in LIDAR and atmospheric sensing experiments highlight the need for studies of the optical bandwidth and wavelength dependence of multi-watt, large bandwidth, high dynamic range polarization-maintaining optical amplifiers in the 2—2.1 µm band.
In this paper we detail experimental studies of the signal wavelength dependence over 2004—2108 nm of a PM hybrid HDFA/TDFA with a single clad Ho-doped preamplifier and a double clad Tm-doped power amplifier. Our hybrid Ho-Tm-doped design provides a PM fiber amplifier with a combination of large output optical signal-to-noise ratio, broad operating bandwidth, and high Pout of 25 W. We simulate supercontinuum generation for various shapes of a dispersion varying As2S3 waveguides on MgF2 substrate with air cladding. The supercontinuum generation is simulated for pulses of 2000 W peak power and 50 fs pulse width centered at 1.55 µm wavelength. For a uniform waveguide the generated spectrum is considerably narrower than that for a non-uniform waveguide. This is because the non-uniform waveguide allows a continuous phase matching of the generated waves through nonlinear interaction. We have demonstrated that a high coefficient of nonlinear refractive index is necessary for generating supercontinuum with large bandwidths.
Larger supercontinuum bandwidth is predicted for waveguides with increasing As2S3 thickness along the propagation direction. Results will be compared with experiments on uniform waveguides. An embeddable, robust and cost-effective optical interferometric strain sensor with nano-scale strain resolution is reported in this paper. The calibration result showed that our prototype sensor can realize a measurement resolution of 30 nanostrain and a sensitivity of 10.01 microstrain/micrometer over a range of 1000 microstrains.
Monitoring the shrinkage strain of a cubic brick of mortar in real time during the drying process was conducted. The sensor was compared with a commercial linear variable displacement transducer, and the comparison results in four weeks demonstrated that our sensor had much higher measurement resolution and gained more detailed and useful information. Spectral-domain interferometry, or simply spectral interferometry, is a key category of fiber-optic sensing that offers ultra-high sensitivity and dynamic range. While broad advances have been made in recent years, some key questions remain elusive. Here we present a theoretical framework for the quantitative assessment of system sensitivity and resistance to demodulation discontinuity (phase jump).
Methods will be discussed to achieve the Cramer-Rao bound on sensitivity and to calculate and minimize the probability of phase jump occurrences. This paper presents the low-cost fabrication of plasmonic fiber-optic based sensors using microsphere photolithography.
Extraordinary Optical Transmission sensors are fabricated in an aluminum film coated on the tip of cleaved single mode fiber. A self-assembled lattice of microspheres is used as an optical element to pattern multiple sensors in parallel. The study shows that despite defects and a lack of alignment to the core, viable sensors can be created at low cost.
The fabricated sensors are tested in various concentrations of sugar water and compared to simulation results. Tuesday 16 April 2019 6:00 PM - 8:00 PM Location: Conv.
307-310 All symposium attendees – You are invited to attend the evening Poster Session to view the high-quality posters and engage the authors in discussion. Enjoy light refreshments while networking with colleagues in your field. Authors may set up their posters between 10:00 am and 5:00 pm the day of their poster session. Special daytime previewing prior to the session from 10:00 am to 5:00 pm. Attendees are required to wear their conference registration badges to access the poster session.:::: Posters that are not set up by the 5:00 pm cut-off time will be considered no-shows, and their manuscripts may not be published. Poster authors should accompany their posters from 6:00 to 8:00 pm to answer questions from attendees.
All posters and other materials must be removed no later than 8:30 pm. Any posters or materials left behind at the close of the poster session will be considered unwanted and will be discarded.
SPIE assumes no responsibility for posters left up after the end of each poster session. A hollow coaxial cable Fabry-Perot resonator for displacement and strain measurement up to 1000 °C is presented here. Inspired by optical fiber Fabry-Perot interferometers, a Fabry-Perot resonator is implemented on a homemade hollow coaxial cable by introducing two highly-reflective reflectors along the cable.
By tracking the shift of the amplitude reflection spectrum of the microwave resonator, the displacement and strain can be determined. The displacement measurement experiment showed the sensor could function properly up to 1000 °C. The sensor was also employed to measure the thermal strain of a steel plate during the heating process from 100 to 900 °C. Inspired by Rayleigh backscattering based sensing methodology on an optical fiber, we present a novel sensing concept based on the random inhomogeneities on a coaxial cable. As an analogy of Rayleigh backscattering along an optical fiber length, “backscattering” also exists from a commercial cable due to its inherent defects along a cable length which induce a local variation. The accumulated back-scattered signals along the cable can be obtained using frequency domain reflectometry.
By analyzing the shift in the local back-scattered signal, the local perturbations can be determined, so that truly distributed sensing capability using a coaxial cable can be achieved. In this study, a simple bidirectional Time Wavelength Division Multiplexed-Passive Optical Network (TWDM-PON) system is designed, simulated and optimized. A remarkable system capacity of 80 Gbps is achieved. Eight optical channels each with eight time slots and 10 Gbps/channel synchronous bit rate for upstream and downstream transmission simultaneously are realized. A power optimization process is carried out to enhance the system bit error rate (BER). A launched optical power/channel of 5 to 10 dBm can maintain a maximum BER of 10-13 over a transmission distance between 20 and 50 km. This architecture is suitable for a fiber to the home (FTTH) cost efficient scheme.
A detailed comparison with the related literature is provided showing the importance and the merits of this study. We develop a novel approach to temperature sensing in extreme environments (e.g., explosions) utilizing an optical temperature sensing technique called two color thermometry. This method involves quantifying the temperature-dependent photoluminescence signal of a phosphor, which can then be used to determine temperature.
Our sensors are based on Dy:YAG, which is coated as a thin film on a sapphire fiber. The thinness of this film allows for fast temperature sensing. We demonstrate our technique in a number of high temperature environments and compare the experimental results to modeling. Traditional fiber quality measurements on single crystal optical fiber usually requires a cut-back method or multiple transmission measurements.
These methods require polishing both fiber ends which is time consuming and highly variable. Recently, we developed an on-line fiber attenuation monitoring method to aid the fabrication of single crystal fibers during Laser Heated Pedestal Growth. The in-situ monitoring helps optimize the growth conditions include the growing speed, rod-to-fiber ratio, position of the crystallization interface; as well as monitoring the impacts from laser power instability.
Fiber optic-based probes are promising candidates for many applications in radiation therapy dose assessment and quality assurance due to their unique practical advantageous properties including the ability to perform in vivo, real-time, and intracavity measurements with high spatial resolution. Significant issues related to fiber optic dosimetry of photon and proton therapies are Čerenkov radiation contamination and ionization quenching effect, respectively. We designed, fabricated, and characterized fiber probes composed of solid core and hollow core fibers in conjunction with scintillators for photon therapy dosimetry. Using a spectroscopic method to subtract the Čerenkov contamination, we showed good agreement between our fiber probe and standard ionization chamber measurements. We also investigated using bare plastic and silica glass fibers for proton therapy dosimetry with minimal ionization quenching effect. The effect of two-photon absorption (TPA) on all-optical logic operation in quantum-dot semiconductor optical amplifier (QD-SOA) has been carried out.
The rate equation was modeled with the TPA effect for the logic XOR gate, AND gate, and, for pseudo-random bit sequence (PRBS) generation. The output Q-factor (quality) has increased due to the implementation of TPA induced pumping. The results show that the quality of the output depends on the input pulse width and the speed of operation. The PRBS system has been shown to operate at 250 Gb/s and 320 Gb/s and the Q-factor decreases with an increase in pulse width. The absence of a proper cladding has been a major hurdle in utilizing single crystal fibers for commercial purposes.
This work discusses the development of high temperature cladding for sapphire fibers using wet chemical methods. Magnesium aluminate spinel has been chosen as a primary material for the cladding as it has a lower refractive index compared to sapphire and does not undergo significant inter-diffusion with sapphire at temperatures below approximately 1200°C. Different sol-gel based approaches have been pursued to develop polycrystalline cladding layers with thicknesses more than a micron. For sapphire fibers, the effect of the cladding layer on optical characteristics like numerical aperture and transmission losses have been studied. High temperature stability of these cladded fibers has also been investigated.
This work details a new sensing element with the potential to extend the detection range of DAS systems. The fibre possesses superior Rayleigh backscatter properties at discrete intervals along the fibre. Optical time domain reflectometry measurements have shown increases in the backscatter signal two orders of magnitude greater than current commercially available sensing fibres. Optical side scattering radiometry measurements have predicted an attenuation of 0.3 dB per km (based upon a reflector placed every meter.). We propose and demonstrate multimode fiber sensors using Rayleigh backscatter to make quantitative acoustic measurements that are immune to signal fading.
While most sensors use single mode fiber, multimode fiber sensors can use higher light levels due to an increased threshold for non-linear effects and can avoid signal fading by simultaneously detecting many spatial modes. We use a high-speed camera to record the entire backscattered field and demonstrate new methods that use off-axis holography to recover quantitative strain information from the time-dependent field data. The multimode fiber sensor exhibits a linear response and a noise level better than 6 pε/√Hz.
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