Approaches for non-uniformity correction and dynamic range extension for acoustography

Don J. Roth; Ameya Mandlik; Jaswinder Sandhu; Lucien Hertert

doi:10.1117/12.601034

9 May 2005 Approaches for non-uniformity correction and dynamic range extension for acoustography

Don J. Roth, Ameya Mandlik, Jaswinder Sandhu, Lucien Hertert

Proceedings Volume 5770, Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring; (2005) https://doi.org/10.1117/12.601034
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

Abstract

Acoustography is a full-field ultrasonic imaging process where a high resolution 2D acousto-optic sensor based on liquid crystal technology is employed to directly convert the ultrasound into a visual image in near real time. Unprocessed acoustography images typically suffer from non-uniformity due to spatial variations in the optical brightness response of the acousto-optic sensor field to ultrasonic intensity. Additionally, dynamic range of the acousto-optic sensor is limited to approximately 20 to 30 db. The nonuniformity and dynamic range limitation can result in difficulty in acoustography image interpretation, impracticality for large field application, and difficulty for use on samples having a wide range of attenuation. The approach of this ongoing study is to apply various methodologies that address these limitations in hopes of extending the usefulness and applications of acoustoography for nondestructive testing. This article shows initial results of methodologies developed to correct for image non-uniformity and explains the proposed approach to extend the dynamic range of acoustography images.

Citation Download Citation

Don J. Roth, Ameya Mandlik, Jaswinder Sandhu, and Lucien Hertert "Approaches for non-uniformity correction and dynamic range extension for acoustography", Proc. SPIE 5770, Advanced Sensor Technologies for Nondestructive Evaluation and Structural Health Monitoring, (9 May 2005); https://doi.org/10.1117/12.601034

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