JLA Vol:7 Iss:2 (A study of polarization‐maintaining fiber characteristics with applications to force and displacement sensing)
Authors:
P. V. P. Yupapin
K. Weir
K. T. V. Grattan
A. W. PalmerAn experimental investigation of three different types of highly birefringent fiber sensor element configured as a force and a displacement sensor is described. From the coupling of power between the two eigenmodes, the magnitude of the force and the position of the coupling point can then be determined using ‘white‐light interferometric’ techniques.
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JLA Vol:15 Iss:4 (Design and performance of multilevel phase fan-out diffractive optical elements for laser materials processing)
Authors:
Keiji Fuse
Takayuki Hirai
Toshihiko Ushiro
Takeshi Okada
Kenichi Kurisu
Keiji Ebata
Itami R&D Laboratories, Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka 554-0024, JapanA multilevel phase fan-out diffractive optical element (DOE) has been developed and introduced into various kinds of laser materials processing such as drilling, cutting, welding, and soldering. The larger the number of arrayed spots the DOE generates on the surface of the workpiece, the more sensitive the intensity uniformity of the spots becomes to fabrication errors, which are deviations between designed and fabric...
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JLA Vol:20 Iss:1 (Optimization of production rate in diode laser hardening)
Authors:
Edoardo Capello
Barbara Previtali
Dipartimento di Meccanica, Politecnico di Milano, Via Bonardi 9, 20133 Milano, ItalyThe present paper is a contribution to the definition of optimal laser hardening conditions with production rate as the main goal. When the part to be treated is given, the optimization problem can be expressed in terms of minimal execution time subjected to two constraints: the depth of treatment and hardness of transformed layer. When the analytical expression of the objective function and the constraints was determined, the feasibility area was described and analyzed. Finally, an optimization algorithm was applied to identify the optimal solut...
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JLA Vol:9 Iss:5 (Experimental development of a machining database for the CO<sub>2</sub> laser cutting of ceramic tile)
Authors:
S. A. J. Livingstone
K. L. Chua
I. Black
Department of Mechanical and Chemical Engineering, Heriot‐Watt University, Riccarton, Edinburgh EH14 4AS, U.K.This paper covers the cutting of commercially‐available ceramic tiles using a CO2 laser cutting machine, with the object of producing a laser beam machining database which contains the essential parameter information for their successful processing. Various laser cutting parameters were investigated that would generate a cut in ceramic tile which required minimal posttreatment. The effects of various shield gases, multipass cutting and underwater cutting were also examined.
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JLA Vol:3 Iss:3 (Fusion Zone Structures in Laser Welded Al‐SiC Composites)
Authors:
Mary H. McCay
T. Dwayne McCay
Narendra B. Dahotre
C. Michael Sharp
Center for Laser Applications, University of Tennessee Space Institute, Tullahoma, Tennessee 37388Metal matrix composites continue to be desirable structural materials but difficulties in joining limit their usefulness. This paper describes the results of a study on the laser welding of A356‐AI/SiC particulate composites. Three separate processing regimes are identified based upon analytical model predictions and metallographic analysis of the solidification structures.
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