Sensors play a large role in monitoring and ensuring that environmental parameters satisfy industrial requirements. They offer crucial safety measures the early detection of hazards. Conventional electrical sensors possess several drawbacks hinder their use sensing. Research has explored optimized optical-based because they are more robust, immune to electromagnetic interference multiplexing capabilities for sensor arrays accompanied by ease modification cater different measurands. Fibre...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We report a compact two-dimensional accelerometer based upon simple fiber cantilever constructed from short length of multicore optical fiber. Two-axis measurement is demonstrated up to 3 kHz. Differential between Bragg gratings written in the provides temperature-insensitive measurements. </para>

We present high average power picosecond and nanosecond pulse delivery at 1030 nm 1064 wavelengths respectively through a novel hollow-core Negative Curvature Fiber (NCF) for high-precision micro-machining applications.Picosecond pulses with an above 36 W energies of 92 µJ, corresponding to peak density 1.5 TWcm -2 have been transmitted the fiber without introducing any damage input output end-faces.High-energy (>1 mJ), which are ideal successfully delivered NCF coupling efficiency...

The fabrication, characterization and encapsulation of a fiber optic temperature sensor based upon micro Fabry-Perot (F-P) cavity is presented. F-P formed between reflective in-fiber metallic splice the air-fiber boundary at end sensor. A change in modifies optical length, this observed as reflected interference spectrum. has been demonstrated for high-temperature measurement up to 1100 °C. stability system ~10 °C over period exceeding 300 h Furthermore, sealed capillary used protective enclosure.

Additive manufacturing (AM) offers the possibility of creating a complex free form object as single element, which is not possible using traditional mechanical machining. Unfortunately typically rough surface finish additively manufactured parts unsuitable for many applications. As result AM must be post-processed; mechanically machined and/or and polished either chemical or techniques (both have their limitations). Laser based polishing on remelting very thin layer it potential highly...

We present the delivery of high energy microsecond pulses through a hollow-core negative-curvature fiber at 2.94 µm. The densities delivered far exceed those required for biological tissue manipulation and are order 2300 J/cm(2). Tissue ablation was demonstrated on hard soft in dry aqueous conditions with no detrimental effects to or catastrophic damage end facets. is guided well confined single mode allowing small controllable focused spot flexibly point operation. Hence, mechanically...

We report the design of a metal powder bed fusion system for in-situ monitoring build process during additive manufacture. Its open-architecture was originally determined to enable access x-rays melt pool, but it also provides area range other measurement techniques. The is sufficiently automated single tracks and high-density, multiple layer components be built. It easily transportable measurements at different facilities its modular enables straightforward modification specific being made....

Single-mode optical fibers with thin nickel coatings (outer diameter ~350 μm) are successfully embedded into stainless steel (SS) 316 components using bespoke laser-based additive manufacturing technology. In our approach, we manufacture SS selective laser melting, incorporating U-shaped grooves dimensions suitable to hold nickel-coated fibers. Coated containing fiber Bragg gratings for strain monitoring and temperature sensing placed in the groove. The embedding is completed by melting...

We report, for the first time, bandgap guidance above 3 mum in a silica based air-core photonic crystal fiber. The peak of is at 3.14mum with typical attenuation ~ 2.6 dB m-1. By further optimization structure, modeling suggests that loss below 1 m-1 should be achievable, greatly extending useful operating range silica-based single-mode fibers. Such fibers have many potential applications mid-IR, offering an alternative to fluoride, tellurite or chalcogenide glass optical chemical and...

Conventional manufacturing of microfluidic devices from glass substrates is a complex, multi-step process that involves different fabrication techniques and tools. Hence, it time-consuming expensive, in particular for the prototyping low quantities. This article describes laser-based enables rapid enclosed micro-structures by laser micromachining microwelding two 1.1-mm-thick borosilicate plates. The was carried out only with picosecond (Trumpf TruMicro 5×50) used for: (a) generation...

A prototype of a scalable and potentially low-cost stacked array piezoelectric deformable mirror (SA-PDM) with 35 active elements is presented in this paper. This characterized by 2 μm maximum actuator stroke, 1.4 sag (measured for 14 mm × area the unpowered SA-PDM), ±200 nm hysteresis error. The initial proof concept experiments described here show that can be successfully used shaping high power laser beam order to improve machining performance. Various shapes have been obtained SA-PDM...

In this paper the delivery of high power Er:YAG laser pulses through a silica hollow core photonic crystal fibre is demonstrated.The wavelength 2.94 µm well beyond normal transmittance bulk but unique guidance allows to guide in regime.We have demonstrated for first time ability deliver energy an all-silica at µm.These fibres are mechanically and chemically robust, biocompatible low sensitivity bending.A maximum pulse 14 mJ was delivered fibre.This, our knowledge, has been shown transmit μm...

Smart materials with integrated sensing capabilities are now ubiquitous in many structures and devices manufactured from composite they offer enhanced safety, reliability efficiency such smart devices. This paper explores the application of embedded sensors to components using additive layer manufacturing (ALM) technology. ALM offers ability create physical parts little or no restriction shape complexity. In this paper, optical fiber incorporating Bragg gratings inside a component made by,...

This paper reports the methods of embedding into 3-D printed metal components a fused silica capillary designed to accept an in-fiber Fabry-Perot cavity-based extreme high-temperature sensor. The are manufactured in stainless steel (SS316) by additive manufacturing using selective laser melting (SLM). temperature sensor consists standard single-mode optical fiber with F-P located at distal end being inserted capillary. is either directly embedded structure during SLM build process or brazed...

We describe the characterization of temperature and strain responses fiber Bragg grating sensors by use an interferometric interrogation technique to provide absolute measurement wavelength. The response was found be nonlinear over range -70 °C 80 °C. nonlinearity observed a quadratic function temperature, arising from linear dependence on thermo-optic coefficient silica glass this range, is in good agreement with theoretical model.

We have measured electron yields from the beam entrance and exit surfaces of thin carbon foils (d\ensuremath{\approxeq}4--700 \ensuremath{\mu}g/${\mathrm{cm}}^{2}$) bombarded with swift (13.6 MeV/u) highly charged (q=16--18) argon ions. The dependence on target thickness charge state ions is analyzed within framework an extended semiempirical model. Due to high velocity ions, it possible distinguish production in primary ionization (related stopping power effective ions) secondary due...

We propose an accelerometer based on a micro-cantilever fabricated onto the side of single mode optical fiber using combination ps-laser machining and focused ion beam (FIB) processing. FIB is also used to fabricate 45° mirror end that accurately aligned with core. This provides reliable means optically address components attached fiber, such as cantilever. Using interferometry monitor deflection cantilever results in device capable measuring two-axis acceleration. Acceleration up 6 g...

The focus of this review is our recent work to develop microstructured hollow core fibers for two applications where the flexible delivery a single mode beam desired. Also, other fiber based solutions included. High power, short-pulsed lasers are widely used micro-machining, providing high precision and quality. However, lack truly systems limits their application processing relatively small planar components. To address this, we developed hollow-core optical 1 μm green wavelength ranges....

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThreshold Photoelectron Spectroscopy of Cl2 and Br2 up to 35 eVA. J. Yencha, A. Hopkirk, Hiraya, R. Donovan, G. Goode, Maier, C. King, KvaranCite this: Phys. Chem. 1995, 99, 19, 7231–7241Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 1995https://pubs.acs.org/doi/10.1021/j100019a004https://doi.org/10.1021/j100019a004research-articleACS PublicationsRequest reuse permissionsArticle...

We describe the use of arrayed waveguide gratings (AWGs) in interrogation fiber Bragg (FBGs) for dynamic strain measurement. The ratiometric AWG output was calibrated a static deflection experiment over +/-200 microepsilon range. Dynamic measurement demonstrated with FBG conventional single-mode mounted on surface vibrating cantilever and piezoelectric actuator, giving resolution 0.5 at 2.4 kHz. present results this technique extended to measure differential between two pairs within...

Distributed transverse load sensing, along an extended length of polarization-maintaining (PM) fibre, has been demonstrated using high spatial resolution (2 cm) optical frequency domain reflectometry (OFDR) which is based on recording a characteristic Rayleigh scatter 'fingerprint' single mode fibre. Application to PM fibre induces localized differential changes the refractive index slow and fast axes, can be monitored simultaneously separately. The magnitude variation affects distributed...

In this paper, we propose techniques to fabricate micro-cantilevers onto the end of standard single mode optical fibres using a combination picosecond laser machining and focused ion beam milling demonstrate their use as temperature sensors. Using approach cantilever can be pre-aligned with core fibre during fabrication, therefore offering stable straightforward means optically addressing cantilever. The is designed measure deflection over range 10 µm simple readout technique. A phase...