We report on recent advances in laser material processing using a novel pulsed fiber platform providing pulse shape agility at the nanosecond time scale and high repetition rates. The shapes can be programmed with resolution of 2.5 ns an amplitude 10 bits. Depending desired performances, pulses are generated either by directly modulating drive current seed diode or output operated CW electro-optic modulators. amplified amplifier chain MOPA configuration. Advanced polarization maintaining LMA...

The translation of CARS imaging towards real time, high resolution, chemically selective endoscopic tissue applications is limited by a lack sensitivity in scanning probes sufficiently small for incorporation into endoscopes.We have developed here custom double clad fiber (DCF)-based probe which designed to suppress the contaminant Four-Wave-Mixing (FWM) background generated within and integrated it based head few millimeters diameter.The DCF includes large mode area (LMA) core as first...

To achieve higher profitability, an important objective in mining applications is to minimize the cost per ton of material moved, which leads use more efficient machines and systems. Among open-cut excavating machines, preference often given electric draglines rope shovels due their high productivity efficiency. Since they are biggest a mine, any efficiency improvements systems would result significant energy savings. The dc distribution has been historically known as effective method power...

Techniques for parameter determination of induction and doubly fed machines are well established. However, these techniques do not apply directly to the brushless reluctance machine (BDFRM). Even though mathematical model this is like that a double-fed machine, complexity magnetic fields due differing winding pole numbers interacting with rotor preclude standard testing. Very high leakage inductances affect use normal locked test, nonsinusoidal air gap fluxes complicate modeling stand still...

This paper proposes a new method for measurement-based modeling of nonlinear loads in power systems. The proposed includes combination binary tree algorithm with autoregressive exogenous input (NARX) identification. demonstrates that the performs well without any prior knowledge system structure. In contrast to other load methods, which are typically aimed particular studies or types, can be used type and study. Accurate is particularly important industrial networks grids. study described,...

We demonstrate the usefulness of INO's pulse-shaping fiber laser platform to rapidly develop complex micromachining processes. The versatility such sources allows for straightforward control emitting energy envelop on nanosecond timescale create multi-amplitude level pulses and/or multi-pulse regimes. are amplified in an amplifier chain a MOPA configuration that delivers output per pulse up 60 μJ at 1064 nm repetition rate 200 kHz with excellent beam quality (M² < 1.1) and...

This paper proposes the use of DC distribution systems in mining applications. In a considerable attention is paid to cost optimization per ton material moved. Therefore, there continuous push more efficient machines and systems. Electric dragline largest excavating machine used mining, with least highest productivity. Any improvement their electrical system would result significant energy saving. On other hand, an effective method power delivery which offers number advantages including...

The Broadband Radiometer (BBR) is an instrument being developed for the ESA EarthCARE satellite. BBR objective to provide top-of-atmosphere (TOA) radiance measurements in two spectral channels, and over three along-track directions. has fixed telescopes (one each view) containing a broadband detector. Each detector consists of uncooled 30-pixel linear focal plane array (FPA) coated with gold black order ensure uniform responsivity from 0.2 μm 50 μm. FPA hybridized readout integrated circuit...

Recently, DC microgrids have become a viable option for mining distribution systems. Fault diagnostics and protection are known challenges in microgrids. In this paper, we present an overview of the existing strategies fault microgrid apply them to open cut mine scenario, which includes large electric excavators. We propose comprehensive tolerance strategy based on analysis electrical mechanical operations rope shovel identification its working cycle. Based strategy, case fault, will be able...

Optical fiber amplifiers used in a MOPA architecture open up lot of possibilities for developing flexible laser sources, thanks to their efficiency, high single-pass gain, broad spectral gain bandwidth and intrinsic beam quality stability. Combining with advanced digital electronics, synchronizing modulating high-speed signals the generation programmable nanosecond pulse shapes bursts picosecond pulses, can make remarkable sources offering unprecedented opportunities exploration laser-matter...

The reinjection of a small fraction the output beam back into laser cavity is shown to improve signal-to-noise ratio cw multilongitudinal mode Ar+ efficiently. argon coupled an external terminated by phase-conjugate mirror in order obtain self-aligned cavity. With cavity, has been significantly improved. low-frequency noise components are reduced up 15 dB, and frequency spectrum longitudinal-mode beating attenuated factors reaching 46 dB.

This paper reports on the development of a fully packaged focal plane array broadband microbolometers. The detector makes use gold black thin film to expand its absorption range from 3 14 μm. A low temperature packaging process was developed minimize sintering absorber during vacuum sealing bolometer package. also laser trimmed prevent lateral diffusion heat and promote better MTF. resulting FPAs show NETD lower than 25 mK at frame rate 50 Hz

We have used coherent photon seeding to reduce the noise in an actively mode-locked extended-cavity semiconductor laser. Feedback is provided by auxiliary cavity terminated either a wedge plate or phase-conjugate mirror. Both conventional and feedback can low-frequency components (0-5 MHz) as much 36 dB, hence drastically reducing pulse fluctuations. A reduction of 18 dB also observed 0.01-3.0-GHz frequency range. obtained these results while preserving duration (26 ps) improving...

This paper assesses the potential of detecting explosives (RDX, TNT, PETN, HMX, HMTD, Urea Nitrate) from a distance with spectroscopic lidar system. For study, temporal and spectral resolutions laser induced fluorescence prototypes were enhanced. The integrated breadboards used easily available Nd:YAG wavelengths (266 nm, 355 532 nm) to remotely detect Raman signatures in traces deposited on surfaces. setup allows for time resolved measurements high resolution. spectra are observable, even...

This paper reports the infrared spectral responses of 17 and 35 μm uncooled bolometers fabricated at INO. They are measured by making use an external readout circuit along with a monochromator. As expected, absorption strongly depends on bolometer stack as well pixel layout. By proper selection design parameters, response can be made flat from 3 to 14 without significant deterioration detector figure merit.

This paper proposes a new method for measurements-based modeling of nonlinear loads in power systems. includes combination binary tree algorithm with Nonlinear Auto-Regressive Exogenous Input (NARX) identification. The demonstrates that the performs well without any prior knowledge system structure. In contrast to other load methods, which are typically aimed particular studies or types, proposed can be used type and study. Accurate is particularly important industrial networks grids. this...

We introduce a new representation of coherent laser beams that are usually described in circular cylindrical coordinates. This is based on the decomposition beam given azimuthal order into exhibiting Cartesian symmetry. These beams, which we call constituent waves, diffract along only one their transverse dimensions and propagate noncollinearly with propagation axis. A cylindrically symmetric then considered superposition waves represented by an integral over angular variable. Such allows...

In this paper a prototype brushless doubly-fed reluctance machine is investigated which aimed meeting commercial performance figures. The has 4 and 8 pole 3-phase stator windings 6 radially-laminated ducted rotor. using finite element analysis (FEA), static torque tests with DC current excitation, MATLAB/Simulink model, experimentally direct control (DTC). investigations show that the can perform match found in industrial drives controllable. This step forward from work been published...

The commercial availability of fiber lasers based on MOPA architectures with arbitrary temporal pulse shaping capabilities offers completely new possibilities for laser material processing. In this study, numerical modeling results in the nanosecond regime case silicon at 1064 nm wavelength, we show that not only single ablation efficiency depends shape but, also demonstrate how a stochastic approach can be applied order to reach an optimized maximizing vaporization rate given energy and...

We show experimentally how diffracting and nondiffracting laser beams can be characterized through their one-dimensional constituent wave. Such a wave stems from an angular decomposition applicable to any cylindrically symmetric beam. In our experiment, spatial filtering in 4-f system is used generate the of each beam under study. Standard root-mean-square (rms) parameters, such as propagation factor generalized Rayleigh range, are then applied determine regime characterize.

In mining power systems, voltage sag caused by the starting currents of direct-on-line asynchronous machines can affect adjacent plant. This paper utilises a STATCOM installed on terminals an machine, implementing support algorithm, to correct sag. Experimental results are presented from three phase, low system showing local correction Further, this presents first experiment conducted in IDEA laboratory, initiative between CRCMining and Power Group at University Newcastle, Australia.