Poudel A.,Southern Illinois University Carbondale |
Shrestha S.S.,Southern Illinois University Carbondale |
Sandhu J.S.,Santec Systems, Inc. |
Chu T.P.,Southern Illinois University Carbondale |
Pergantis C.G.,U.S. Army
Composites Part B: Engineering
This paper presents the use of a novel through-transmission ultrasonic (TTU) Acoustography non-destructive evaluation (NDE) method to detect foreign object inclusion (FOI) defects in graphite epoxy composite laminates. The study employed three different composite test standards with varied size FOI defects embedded at varying depth within the composite laminates. For validation, Acoustography results were directly compared with conventional immersion TTU testing and infrared thermography (IRT) methods. From results obtained, it was demonstrated that the Signal-to-Noise Ratio (SNR) measurements for Acoustography were more than 6:1 and were in good correlation with immersion TTU and IRT results. The defect sizing ability of TTU Acoustography for FOI defects in graphite epoxy composite laminates were also in strong correlation with immersion TTU and IRT techniques. Finally, for the three laboratory systems employed in this study, typical panel TTU Acoustography inspection time was just about three minutes to scan a 300 mm × 300 mm (11.8″ × 11.8″) area, which was more than three times faster compared to IRT and sixty times faster to conventional immersion TTU C-Scan techniques. This is a very significant finding for the reason that Acoustography is being developed as a faster, more efficient, and affordable alternative to traditional ultrasonic inspection systems for composite manufacturing quality control and quality assurance (QC/QA) and field maintenance of composite structure applications. © 2015 Elsevier Ltd. All rights reserved. Source
Santec Systems, Inc. | Date: 2014-08-21
Plumbing fixtures and fittings, namely, faucets, tubs for bathing and shower, toilets, toilet bowls, toilet tanks, toilet tank levers, urinals, bidets, sinks, strainers for water lines, traps, whirlpools, spas with units providing a massaging effect by emitting a stream of water and pumps, inlets and suction fittings therefor, valves, tub-waste assemblies, shower and tub fixtures, namely, shower heads and hand-held showers, electric hot air hand dryers, dehumidifiers, and aerators for attachment to faucets, hydromassage products, namely, bathtubs with hydromassage units, combination shower and bathtubs with hydromassage units, spas with hydromassage units, tubs with hydromassage units, and water pumps, inlets and suction fittings for hydromassage units. Bath and shower accessories, namely, wash basins, toilet paper holders, soap dishes, towel rings, racks and bars, tumbler and toothbrush holders, wall-mounted handrails for the bathroom, cabinet and drawer knobs made of porcelain, ceramic or glass, decorative metal plates, and soap dispensers.
Agency: Department of Health and Human Services | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 115.25K | Year: 2010
DESCRIPTION (provided by applicant): The objective of this project is to use a 2D area detector called Acousto-Optic (AO) sensor to provide an acoustic output monitoring method for HIFU transducers, where the need for two separate methods, radiation force balance and hydrophone scanning, is circumvented. The AO sensor provides an instant 2D image of the radiated HIFU field, which currently requires the very slow point-by-point scanning of a needle hydrophone by a trained operator. Unlike the radiation force balance, the AO sensor provides a direct measure of the acoustic intensity as opposed to just total power. Successful completion of this work will provide a superior method for monitoring acoustic output HIFU transducers, which is critical for ensuring correct ultrasound dose delivery by the HIFU transducer for effective cancer treatment and minimizing collateral damage to healthy tissue. PUBLIC HEALTH RELEVANCE: The successful development of the proposed AO sensor based acoustic output monitoring device could enable routine, on-site assessment of HIFU transducer performance, which is imperative to insure correct dose delivery for HIFU cancer treatment. Current practice of using a combination of hydrophone and radiation force balance methods to establish HIFU transducer output are laboratory based, and do not lend themselves for on-site assessment of HIFU transducers.
Agency: Department of Defense | Branch: Army | Program: SBIR | Phase: Phase I | Award Amount: 99.96K | Year: 2003
Novel acousto-optic (AO) sensors that overcome the limitations of current AO sensor will be developed. These sensors will be used to demonstrate feasibility of an ultrasonic evaluation system to provide simple, fast and low-cost method for NDE of fieldedstructures. The proposed approach will circumvent the need for cumbersome, multi axes mechanical scanning equipment required in conventional ultrasonic scanning. The operator skill requirements are expected to be relatively low, since data is provided inimage form as opposed to an electronic signal. There is a significant potential for the proposed work to address the health monitoring needs of the Dept. of Defense aviation and other structures.
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 0.00 | Year: 2002
In this project, new liquid crystal materials will be developedto achieve significant improvements in the acosutic detectionsensitivity and transient response of present liquid crystalbased acoustic detectors. The new detectors will be employed inthe underwater acoustic imaging camera, developed in Phase I, toproduce images of mine-like targets with high image quality,large dynamic range and adequate frame rates.BENEFITS: This work could lead to the development of a practical, low cost acoustic imaging camera device for military and commercial applications (e.g. mine detection, nondestructive testing, medical imaging, etc.).