A Study of the Effects of Multiple Pulse Laser Exposure on Increment Thresholds PDF Download
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Author: Peter Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Author: Peter Smith
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Little is known about the effects of brief, repetitive laser pulses in the microsecond and sub-microsecond range on visual adaptation. Although it is generally acknowledged that, for pulsed light exposures from 1 to 150 ms, the total energy of a flash (intensity x duration) determines its brightness or adaptation potential, there are little data supporting this reciprocal relationship in human subjects. The purpose of this study was to compare the increment threshold for a spot target superimposed on an extended source image of a pulsed laser source, and to evaluate whether reciprocity holds. Eight subjects completed a method-of-adjustment determination of increment threshold for a 023 white test spot viewed superimposed on an extended source image (0.61) of a green (532 nm) laser beam. The laser pulse durations were 10 micro s, 100 micro s, 1 ms and 10 ms at 3 Hz and 10Hz. In addition, the effect of continuous wave (CW) exposure was determined. The time-average laser exposure was held constant across all the laser conditions. For the 3 Hz pulse condition, the threshold luminance was much lower than for the CW condition and there was no effect of pulse width, i.e. reciprocity was observed. However, thresholds for the 1 ms and 10 ms pulses at 10 Hz were higher than for the DW case, and this reciprocity failure was interrupted as a brightness enhancement effect More pulse durations and pulse rates must be studied before this failure can be more fully understood.
Author:
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Category : Power resources
Languages : en
Pages : 1332
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Author:
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Category : Aeronautics
Languages : en
Pages : 1134
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Author:
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ISBN:
Category : Laser materials
Languages : en
Pages : 424
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Author: William P. Roach
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Eye
Languages : en
Pages : 694
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Book Description
This volume contains key papers that document the initial probing of the limits of subnanosecond pulses and the resulting discoveries of nonlinear effects. The papers tell the story of effects previously thought to be impossible to produce in tissue. If you read all the references carefully, you will see the studies evolve from speculation to experimentation to theory, and culminate in policy recommendations.
Author: Alexander J. Glass
Publisher:
ISBN:
Category : Laser materials
Languages : en
Pages : 372
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Author:
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Category : Weights and measures
Languages : en
Pages : 460
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Author: D. H. Sliney
Publisher: Springer Science & Business Media
ISBN: 1489935967
Category : Medical
Languages : en
Pages : 1042
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Book Description
Nearly a decade aga a general review article on the evaluation of optical radia tion hazards was published in Applied Optics (Sliney and Freasier, 1973). This arti cle received many favorable comments but also prompted many inquiries regarding specific optical hazard problems. From this it became evident that a monograph rather than a supplemental and expanded article was needed to fill this literature gap relating to laser and optical radiation hazards. The present work is designed to fill that gap, and is structured to permit either classroom or self-study use. Much of the material in this book was developed in eonnection with short courses on laser safety and radiometry in which we have participated, as weIl as from our previous articles. In particular, the sequenee of chapters is based upon the experiences which we have had in lecturing in courses with different schedules. One of the great difficulties in developing a text of this nature is that a broad, multidisciplinary background must be included in order that the reader can comprehend all of the subjeet matter readily. For this reason, the material presented on anatomy and physiology is orien ted toward the engineer or physical scientist, while the review material on basic optical physics is intended more for the physician or life scientist.
Author:
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Category : Toxicology
Languages : en
Pages : 884
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