NDLI: Statistical moments of backscattered ultrasound in porous fiber reinforced composites

Content Provider	IEEE Xplore Digital Library
Author	Grolemund, D. Tsai, C.S.
Copyright Year	1986
Abstract	Statistical moments are important tools for understanding wave propagation in random media and are applied here to backscatter measurements in porous, fiber-reinforced polyimide composites. High temperature resins, such as PMR-15, used in load critical components are much more prone to void production than traditional epoxies. Porosity was induced in thin laminates by cure cycle perturbations and quantified destructively as to void content (0.3 to 8.1%) and radius distribution (10 to 250 /spl mu/m). Measurements of the statistical moments of the scattered field were made using a single, large aperture transducer. Backscatter signals were acquired and used to calculate the rectified ensemble average, and the point signal-to-noise ratio. The lateral and axial full-width half-maximum (FWHM) were extracted from a two-dimensional auto-covariance of the field and compared to the limiting values set by the diffraction pattern and bandwidth of the measurement transducer. Results confirm that the statistical behavior of the echo amplitudes from porous fabric laminates follow predictions based on circular Gaussian statistics for void contents in the range 2 to 5%. Deviations from these predictions occur for void contents outside this range primarily due to changes in the void distribution. These results are important to the development of better void content measurement techniques and are particularly crucial when imaging specularly reflecting defects embedded in a porous volume because spatial and contrast resolution are limited by speckle and the image signal-to-noise.
Page Count	10
File Size	417472
Starting Page	295
Ending Page	304
File Format	PDF
ISSN	08853010
Volume Number	45
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Backscatter Laminates Transducers Random media Ultrasonic variables measurement Polyimides Temperature Resins Production
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Phase-Insensitive Detection for Measurement of Backscattered Ultrasound

Multilayer piezoelectric resonators for medical ultrasound transducers

Air-Coupled Ultrasound: A Novel Technique for Monitoring the Curing of Thermosetting Matrices

Three-dimensional spatial and temporal temperature imaging in gel phantoms using backscattered ultrasound

Accurate measurement of microbubble response to ultrasound with a diagnostic ultrasound scanner

Development and characterization of a tissue-mimicking material for high-intensity focused ultrasound

Suppression of propagating second harmonic in ultrasound contrast imaging

Modeling and optimization of high-frequency ultrasound transducers

Ultrasonic scattering measurements of a live single cell at 86 MHz

Statistical moments of backscattered ultrasound in porous fiber reinforced composites

Similar Documents

Phase-Insensitive Detection for Measurement of Backscattered Ultrasound

Multilayer piezoelectric resonators for medical ultrasound transducers

Air-Coupled Ultrasound: A Novel Technique for Monitoring the Curing of Thermosetting Matrices

Three-dimensional spatial and temporal temperature imaging in gel phantoms using backscattered ultrasound

Accurate measurement of microbubble response to ultrasound with a diagnostic ultrasound scanner

Development and characterization of a tissue-mimicking material for high-intensity focused ultrasound

Suppression of propagating second harmonic in ultrasound contrast imaging

Modeling and optimization of high-frequency ultrasound transducers

Ultrasonic scattering measurements of a live single cell at 86 MHz

Statistical moments of backscattered ultrasound in porous fiber reinforced composites