3 edition of Generalized pulse equations for through-transmission evaluation of multilayered structures found in the catalog.
Generalized pulse equations for through-transmission evaluation of multilayered structures
by National Aeronautics and Space Administration, Goddard Space Flight Center, For sale by the National Technical Information Service] in Greenbelt, MD, [Springfield, Va
Written in English
|Statement||E. James Chern, Hatsumi T. C. Nielsen.|
|Series||NASA technical memorandum -- 100752.|
|Contributions||Nielsen, Hatsumi T. C., Goddard Space Flight Center.|
|The Physical Object|
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A set of equations is constructed based on the fact that the sum of the currents owing into any node in the circuit is zero. In microwave circuits the nodal equations are usually set up in the denite form; that is, the voltage of each node is taken with respect to a designated node . In ultrasonic nondestructive evaluation (NDE) applications, a large number of materials have multilayered structures. NDE of multilayered structures leads to some specific problems, such as penetration, echo overlap, high attenuation and low signal-to-noise ratio.
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Generalized transit time and pulse amplitude equations have been derived for modeling the ultrasonic through-transmission wave propagation of an arbitrary n-layered structure. The equations can be programmed into an expert system and used to identify and predict the through-transmission pulse signals from the critical interfaces of a multilayered : E.
James Chern, Hatsumi T. Nielsen. Get this from a library. Generalized pulse equations for through-transmission evaluation of multilayered structures. [E James Chern; Hatsumi T C Nielsen; Goddard Space Flight Center.].
Generalized pulse equations for through-transmission evaluation of multilayered structures [microform]  Chern, E. James. Greenbelt, MD: National Aeronautics and Space Administration, Goddard Space Flight Center ; [Springfield, Va. Full text of "Monthly catalog of United States government publications" See other formats.
The three-dimensional method of generalized ray is formulated to analyze the propagation of transient elastic waves in a multilayered solid. An integral representation, referred to as a ray integral, of the multiply reflected and transmitted spherical wave is derived. A system of linear equations is presented, giving the opportunity to find the model for both pulse-echo and through-transmission measurements.
A thorough effort is made on the parameter estimation. Ultrasound velocity was used to study developmental changes of stem tissues in cereal plants. The velocity of longitudinal waves, MHz, was measured with pulsed through-transmission method in axial direction of stem.
The v determined on the same stem position varied from m/s to m/s as the plants grew and matured. The equations for DPSM modeling in viscous fluids are derived in this paper by decomposing the linearized viscous fluid equations into two components-dilatational and rotational components.
By considering complex P- and S-wave numbers, the acoustic fields in viscous fluids can be calculated following similar calculation steps that are used for. The obtained result highlight a very good fitting between the predicted results (calculated one) and the real evaluation.
These equations will be used in a near future in the frame of the. Proc. SPIEAdvanced Microwave and Millimeter-Wave Detectors, pg 2 (14 September ); doi: / You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read.
Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Sensors, an international, peer-reviewed Open Access journal. Dear Colleagues, Acoustics has profoundly affected today’s world in a broad range of technologies, including underwater sonar, audio communication, industrial non-destructive testing (NDT), industrial sensing, chemical and biological sensing, smart city, precision actuation, material processing and manufacturing, medical imaging.
Journal of Non Destructive Testing & Evaluation About the cover page: Volume 11 issue 2 September Contents Chapter News. 9 Basics - Modelling and simulation for Nondestructive Evaluation. Objectives-aims-examples of monitoring and diagnosis-control structures for machine diagnosis-utilization of diagnostic results.
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pma advanced applied mathematics * 3 1 0 4 4 2. Mean burst pulse duration was s 共SDrange s - s兲. Seven segments with high signal to noise ratios were manually selected for analysis in Matlab. Mean pulse rate was Hz 共SDrange Hz - Hz兲.
These durations and pulse rates. Destructive Testing – pulse echo system through transmission and reflection modes - A,B and C – scan displays, Medical applications - Sonogram UNIT V PHOTONICS AND FIBRE OPTICS 9 Spontaneous and stimulated emission- Population inversion -Einstein’s A and B coefficients - derivation.
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