High-resolution dynamic photoelastic study of laser-generated sound in polymer

David C. Emmony; M. K.B. Suaidi; Y. H. Jin; Barry Ward

doi:10.1117/12.145789

1 January 1993 High-resolution dynamic photoelastic study of laser-generated sound in polymer

David C. Emmony, M. K.B. Suaidi, Y. H. Jin, Barry Ward

Proceedings Volume 1801, 20th International Congress on High Speed Photography and Photonics; (1993) https://doi.org/10.1117/12.145789
Event: 20th International Congress on High Speed Photography and Photonics, 1992, Victoria, BC, Canada

Abstract

The interaction of laser radiation with materials can lead to the generation of thermal and acoustic transients. If the laser pulse is of short duration and high power as in the case of a Q switched Nd YAG laser, then shock waves may be formed with fast rising pressure fronts. The optical diagnostics of laser generated sound waves therefore requires high spatial, approximately 10 micrometers , and high temporal, approximately 10 ns, resolution, in order to make quantitative measurements. A nitrogen laser pumped dye laser with a pulse length of 0.4 ns has been used as the light source for a Mach-Zehnder interferometer. The interferometer was modified to enable dynamic photoelastic interferograms to be taken. Recording was by means of a CCD video camera and computer controlled digitizing frame grabber. This system has been employed to study laser generated waves at water-polymer boundaries and the diffraction of ultrasound by defects in the solid material. The isochromatic fringe patterns, together with an approximate Abel inversion procedure, allow the radial pressure distribution in the polycarbonate test samples to be calculated. The ultimate aim is to obtain the near field diffraction coefficients for use in NDT modeling.

Citation Download Citation

David C. Emmony, M. K.B. Suaidi, Y. H. Jin, and Barry Ward "High-resolution dynamic photoelastic study of laser-generated sound in polymer", Proc. SPIE 1801, 20th International Congress on High Speed Photography and Photonics, (1 January 1993); https://doi.org/10.1117/12.145789

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Geometrical optics

Photoelasticity

Solids

Acoustics

Neodymium

Diffraction

Pulsed laser operation

Show All Keywords

Keywords/Phrases

Search In:

Publication Years