J. Stuart Nelson
Michael W. Berns
Beckman Laser Institute and Medical Clinic, University of California, Irvine, 1002 Health Sciences Road East, Irvine, California 92715
A. Edward Profio
T. F. Khoury
Department of Chemical and Nuclear Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106 U.S.A.
School of Medicine, University of British Columbia, Vancouver, B.C., Canada
The effective absorbed dose in photodynamic therapy is proportional to the concentration of the photosensitizer, as well as to the radiant energy fluence and concentration of oxygen. The concentration of dihematoporphyrin ether/ester (DHE) has been measured in tissue specimens by chemical extraction followed by spectrofluorimetry against a standard solution, and by an in vivo fluorometer probe calibrated ag...
Laser‐Aided Materials Processing Laboratory, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana‐Champaign, 1206 West Green Street, Urbana, Illinois 61801, U.S.A.
Synthesis of nonequilibrium phases provides an opportunity to engineer new materials with novel properties. The technique of laser surface modification (LSM) provides a unique means of synthesizing novel non‐equilibrium materials by taking advantage of the inherent rapid heating and cooling rate of the process. LSM can be used to obtain specific surface properties significantly diffe...
James W. Wagner
The Johns Hopkins University, Center for Nondestructive Evaluation, Maryland Hall 102, Baltimore, Maryland 21218
Optical methods for detection of ultrasonic signals offer the potential for performing noncontact and remote sensing for ultrasonic inspection and acoustic emission testing of materials and structures. These capabilities are of particular advantage for sensing applications at elevated temperatures or in hostile environments. While a number of optical detection methods have been employed in the past, most efforts have involved the development of interferometric techniques of one form or another. Technological advances in conventional and holographic...
Richard P. Felten
Senior Chemist, Radiation Biology Branch, Center for Devices and Radiological Health, Food and Drug Administration
John M. Kokosa
GMI Engineering & Management Institute, Flint, Michigan 48504 U.S.A.
Beckman Laser Institute, Irvine, California 92715 U.S.A.
Lasers are assuming an increasingly important role in surgical procedures. However, several studies have shown that the smoke produced by laser‐tissue interaction is an airway irritant. Preliminary studies in our laboratories have shown that potentially hazardous chemicals, including benzene, formaldehyde and acrolein are present in the smoke plume resulting from CO2 and Nd:YAG laser interaction with animal tissue, even at low power densities. Since these chemicals are classified a...
JLA Vol:1 Iss:3 (CO<sub>2</sub> Laser Engraving System for Relief Plate to Print Corrugated Cardboard)
NEC Corporation, Laser Equipment Div., 1120, Shimokuzawa, Sagamihara, JAPAN
A very compact and economical CO2 laser engraving system to make relief plates for the purpose of printing corrugated cardboard has been developed. This system consists of a highly stable 500W CO2 laser and a high speed, easy handling image processing sub‐system. In this paper several new developments are described. This image processing technique for CO2 laser raster scanning and engraving has been newly developed. Every binary image is converted to the relief plate more easier than other reported engraving systems.
W. D. Bachalo
Aerometrics, Inc., Sunnyvale Technology Center, 894 Ross Drive, Unit 105, Sunnyvale, CA 94089
A discussion of the practical aspects of particle sizing using light scatter detection is presented. The primary focus is on single particle counter methods for performing in situ size and velocity measurements. One objective of the presentation is to provide information on the applicability and limitations of these methods when measurements in practical environments are required. The problem of dealing with irregularly‐shaped particles is considered. Light scattered by such particles is not easily analyzed except in the near‐forward direction. Examples o...
E. A. Metzbower
U.S. Naval Research Laboratory, Code 6324, Washington DC 20375‐5000, U.S.A.
E. A. Metzbower
U.S. Naval Research Laboratory, Code 6324, Washington, DC 20375‐5000, U.S.A.