JLA Vol:4 Iss:2 (Dynamic Laser Doppler Velocimetry on Solid Surfaces)
Authors:
Milind M. Rajadhyaksha
Warren H. Stevenson
Applied Optics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, U.S.A.This paper presents the results of a detailed analytical and experimental investigation into the accuracy of a differential laser Doppler velocimeter (LDV) for dynamic, solid surface velocity measurements made over very short averaging times on the order of one millisecond. Accuracy limitations are derived, along with operating conditions and signal processing considerations needed to optimize LDV performance. An experiment is described which demonstrates the use of an LDV to instantaneously and accurate...
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JLA Vol:4 Iss:2 (Fracture Characteristics of an Aluminum Oxide Ceramic during Continuous Wave Carbon Dioxide Laser Cutting)
Authors:
R. N. Smith
R. P. Surprenant
D. A. Kaminski
Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, New York 12180‐3590A series of experiments was conducted to determine the influence of workpiece thickness, cutting speed, and beam power on the onset of fracture in aluminum oxide (Al2O3) during continuous wave CO2 laser cutting. Samples of Coors AD‐96 substrate of thickness 0.040, 0.050, and 0.080 in. thick, respectively, were cut at combinations of feedrates and power levels to determine the conditions at which fracture of this ceramic occu...
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JLA Vol:4 Iss:2 (On‐The‐Fly Drilling with a Fiber Delivered Face Pumped Laser Beam)
Authors:
Angel L. Ortiz
General Electric Corporate Research and Development, 1 River Road, P.O. Box 8, Bldg. KWC‐617, Schenectady, New York 12301A high power Neodymium: Yttrium‐Aluminum‐Garnet (Nd:YAG) Total‐lnternal‐Reflection Face Pumped Laser (TIR‐FPL) coupled with a fiber delivery system has been proven to be a powerful processing tool for On‐The‐Fly (OTF) drilling [1–3]. Single‐Pulse OTF drilling, (i.e., one laser pulse per hole with continuous part motion) at shallow angles to the surface with material thicknesses up to 50 mils can be easily accomplished generating good quality holes. Optical sensors...
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JLA Vol:4 Iss:3 (ANSI Laser Safety Standard Historical Development)
Authors:
M. L. Wolbarsht
D. H. Sliney$25.00
JLA Vol:4 Iss:3 (Engineered Safety: First Line of Defense)
Authors:
Melvin D. Barger$25.00
JLA Vol:4 Iss:3 (High Tech or High Risk — The laser on your manufacturing floor)
Authors:
Tom Wiley
Lumonics Industrial Products Division$25.00
JLA Vol:4 Iss:3 (In the Canadian World: No Second Chances)
Authors:
Jeff Elie$25.00
JLA Vol:4 Iss:3 (Laser Safety in Health Care Facilities — Revision of ANSI Z136.3‐1988)
Authors:
Rocco V. Lobraico
Co‐chairman Z136.3 subcommittee$25.00
JLA Vol:4 Iss:3 (Laser Safety Incident Records Illustrate Deficiencies in Reporting and Training)
Authors:
Sidney S. Charschan
Editor‐in‐Chief JLA and chairman ANSI Z136 Accredited Standards Committee$25.00
JLA Vol:4 Iss:3 (Laser Safety Primer Outline for Industrial/Medical Users)
Authors:
T. J. Glynn
M. Walsh
National Centre for Laser Applications, Physics Dept., University College, Galway, IrelandLaser safety standards are detailed technical documents arising from the complexity of the different mechanisms, depending on the parameters of the laser beam, by which lasers interact with living tissue. As a result, their interpretation by non‐expert laser users, who are concerned about safety issues, can cause many difficulties. Based on experience in advising industrial and medical laser users, we have developed a primer which (
i ) provides step‐by‐step guidance in the interpretation and use of the laser saf...$25.00