Date of Award

Spring 1998

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical Engineering

Committee Director

Amin N. Dharamsi

Committee Member

Sacharia Albin

Committee Member

Linda L. Vahala

Call Number for Print

Special Collections LD4331.E55 X829

Abstract

Pulsed diode laser optoacoustic diagnostics were carried out to characterize solid sample materials. The apparatus developed is compact, portable, cost-effective and therefore very promising for both industrial as well as laboratory applications. To our knowledge, this is the first time that optoacoustic characterization and measurement have been performed with a diode laser. The method was successfully applied to measure the thickness of a multilayer structure non-intrusively. Internal cracks of the material were detected by this technique.

A theory for optoacoustic signal generation, propagation and detection is given. A numerical analysis technique is developed to solve for the expected signal. In addition, the analogy between electromagnetic and acoustic field theory is discussed. Aspects of attenuation and dispersion that result from the presence of nonzero conductivity (in electromagnetic fields) and nonzero viscosity (in acoustic fields) are discussed and compared. The results of our numerical analysis show excellent agreement with the acoustic transmission line model and demonstrate the validity of the former. The experimental results obtained are compared with the theoretical results from our numerical analysis technique and the two sets of results show very good agreement.

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DOI

10.25777/82tc-rv95

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