Homodyne detection of ultrasonic surface displacements using two-wave mixing in photorefractive polymers

Marvin B. Klein; Gerald David Bacher; Anders Grunnet-Jepsen; Daniel Wright; William E. Moerner

doi:10.1117/12.339966

4 February 1999 Homodyne detection of ultrasonic surface displacements using two-wave mixing in photorefractive polymers

Marvin B. Klein, Gerald David Bacher, Anders Grunnet-Jepsen, Daniel Wright, William E. Moerner

Author Affiliations +

Proceedings Volume 3589, Process Control and Sensors for Manufacturing II; (1999) https://doi.org/10.1117/12.339966
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

Abstract

In recent years, a number of adaptive interferometers have been used for the remote detection of laser-generated ultrasonic waves in parts under inspection. One type of adaptive interferometer uses two-wave mixing in a photorefractive material to form a real-time hologram, or adaptive beamsplitter. In this work we describe such an interferometric receiver based on two-wave mixing in photorefractive (PR) polymers. The PR polymers have a number of very promising technical features for this application which will be described in detail. In addition, the polymer composition can be tailored to specific requirements and the materials can be processed into a variety of different shapes and forms. Finally, when compared with inorganic photorefractive crystals, the polymers are inexpensive and simple to fabricate. We have taken advantage of the above features to demonstrate homodyne detection in the PR polymers with a sensitivity that is within a factor of three of the limit for an ideal homodyne system. We have also used a laboratory receiver to detect ultrasonic waves with good signal-to-noise. In this talk we will discuss the physical features of our polymer-based receiver and describe our experiments to characterize this system.

Citation Download Citation

Marvin B. Klein, Gerald David Bacher, Anders Grunnet-Jepsen, Daniel Wright, and William E. Moerner "Homodyne detection of ultrasonic surface displacements using two-wave mixing in photorefractive polymers", Proc. SPIE 3589, Process Control and Sensors for Manufacturing II, (4 February 1999); https://doi.org/10.1117/12.339966

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