Location

La Jolla, CA

Start Date

1-1-1998 12:00 AM

Description

The use of modulated laser pulses to generate ultrasonic tonebursts has been demonstrated in recent years for improving the signal to noise ratio of laser generated ultrasound waves [1]. Q-switched laser pulses generate broadband signals that can be difficult to measure because statistically, white noise is also broadband. If narrowband ultrasound can be generated then bandpass filters can be used to narrow the bandwidth of the ultrasonic reception system, the signal to noise ratio is inversely proportional to bandwidth, so signal enhancement can be achieved by using modulation. This is the primary motivation for modulating laser pulses in ultrasonic nondestructive testing.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

17A

Chapter

Chapter 2: Emerging Technologies

Section

Laser/Optical Ultrasonics

Pages

683-689

DOI

10.1007/978-1-4615-5339-7_88

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Analysis of Intensity Modulated Pulse Train Length for Laser Ultrasonic NDT

La Jolla, CA

The use of modulated laser pulses to generate ultrasonic tonebursts has been demonstrated in recent years for improving the signal to noise ratio of laser generated ultrasound waves [1]. Q-switched laser pulses generate broadband signals that can be difficult to measure because statistically, white noise is also broadband. If narrowband ultrasound can be generated then bandpass filters can be used to narrow the bandwidth of the ultrasonic reception system, the signal to noise ratio is inversely proportional to bandwidth, so signal enhancement can be achieved by using modulation. This is the primary motivation for modulating laser pulses in ultrasonic nondestructive testing.