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Pseudo-Random Modulation of a Laser Diode for Generation Ultrasonic (1999)
| Venue: | Longitudinal Waves,” 26 th Annual Review of Progress in Qualitative Nondestructive Evaluation |
| Citations: | 4 - 3 self |
BibTeX
@INPROCEEDINGS{Madaras99pseudo-randommodulation,
author = {Eric I. Madaras and Robert F. Anastasi},
title = {Pseudo-Random Modulation of a Laser Diode for Generation Ultrasonic},
booktitle = {Longitudinal Waves,” 26 th Annual Review of Progress in Qualitative Nondestructive Evaluation},
year = {1999}
}
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Abstract
INTRODUCTION Laser generated ultrasound systems have historically been more complicated and expensive than conventional piezoelectric based systems, and this fact has relegated the acceptance of laser based systems to niche applications for which piezoelectric based systems are less suitable. Lowering system costs, while improving throughput, increasing ultrasound signal levels, and improving signal-to-noise are goals which will help increase the general acceptance of laser based ultrasound. One current limitation with conventional laser generated ultrasound is a material's damage threshold limit. Increasing the optical power to generate more signal eventually damages the material being tested due to rapid, high heating [1,2]. Generation limitations for laser based ultrasound suggests the use of pulse modulation techniques as an alternate generation method. Pulse modulation techniques can spread the laser energy over time or space, thus reducing laser power densities and minimizing dam
Keyphrases
laser diode pseudo-random modulation generation ultrasonic pulse modulation technique high heating current limitation alternate generation method system cost introduction laser generation limitation ultrasound signal level optical power conventional laser general acceptance laser power density ultrasound system laser energy
