SURFACE ROUGHNESS AFFECTS BOTH THE SHAPE OF AN ULTRASONIC IMPULSE TRANSMITTED THROUGH AN INTERFACE AND ITS POWER SPECTRUM.

Award Information
Agency: Department of Defense
Branch: Army
Contract: N/A
Agency Tracking Number: 4026
Amount: $48,651.00
Phase: Phase I
Program: SBIR
Awards Year: 1986
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Rt 3 - Box 212, Stillwater, OK, 74074
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 JAMES N LANGE
 (405) 377-0826
Business Contact
Phone: () -
Research Institution
N/A
Abstract
SURFACE ROUGHNESS AFFECTS BOTH THE SHAPE OF AN ULTRASONIC IMPULSE TRANSMITTED THROUGH AN INTERFACE AND ITS POWER SPECTRUM. TO FULLY APPLY ADVANCED SIGNAL ANALYSIS TECHNIQUES TO DETERMINING QUANTITATIVE INFORMATION ABOUT DEFECTS AND IMPERFECTIONS IT IS NECESSARY TO COMPENSATE FOR THE FREQUENCY DEPENDENT EFFECTS INTRODUCED BY SURFACE ROUGHNESS. THIS PROJECT PROPOSES TO MODEL SURFACE ROUGHNESS TO OBTAIN A MEANS OF NUMERICALLY EVALUATING ITS EFFECT ON BOTH THE POWER SPECTRUM OF A TRANSMITTED IMPULSE AND THE TEMPORAL TRANSMITTED SIGNAL. THE ROUGHNESS IS SCALED RELATIVE TO AN ACOUSTIC WAVELENGTH AND IS DIVIDED INTO FINE GRAINED AND LARGE SCALE IRREGULARITIES. THE FINE GRAINED ROUGHNESS IS MODELED BY AN INTERVENING LAYER WITH EFFECTIVE PHYSICAL PROPERTIES. THE SOLUTION TO THE MODEL ROUGHNESS CONFIGURATION PROVIDES A TRANSFER FUNCTION WHICH YIELDS THE FOURIER SPECTRUM OF THE TRANSMITTED IMPULSE FROM WHICH THE POWER SPECTRUM IS DETERMINED. BY COMPENSATING FOR THE EFFECT OF SURFACE ROUGHNESS, A MORE DETAILED QUANTITATIVE ANALYSIS OF DEFECT STRUCTURE IS POSSIBLE.

* Information listed above is at the time of submission. *

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