Quasar International, Inc.

Electric Power Research Institute Incorporated

Quatro Corporation

David E Thomas

James J Schwarz

Ming Lei

George Rhodes

Gary H Shapiro

Ronald Karaskiewicz

Frank S Nickel

Stephen J Halko

Thomas M Salas

Carl M Wiggins

Methods for the prediction of the frequency of high order resonant ultrasound spectroscopy (RUS) diagnostic modes are used to limit the band width of diagnostic testing at high order mode frequencies. Testing of parts at low order frequency modes is used to calculate part dimensions, and then these calculated part dimensions are used to predict high order diagnostic mode frequencies. Lower order mode frequencies are used to predict high order diagnostic mode frequencies.

Detection of defects using resonant ultrasound spectroscopy at predicted

A method for temperature compensation of resonant frequency measurements of parts uses Temperature Functions which are mathematical relationships between measured resonant frequencies and temperature. The Temperature Function is used to adjust frequencies measured at any temperature to a resonant frequency at a pre-determined reference temperature. The temperature of a surrogate part or specimen can be measured to eliminate the need to touch a part being tested where the surrogate part has essentially the same dimensions and material properties and is positioned and mounted such that its temperature is essentially the same as the part being tested. The temperature function may be in the form of

Temperature compensation of resonant frequency measurements for the

A method is provided for detecting resonant ultra sound (RUS) Spectroscopy peaks which is based upon taking the second derivative of the RUS spectrum. The second derivative provides a more sensitive analysis tool, and makes it possible to separate and distinguish peaks in the spectrum which are not readily discernable by other analyses of the spectrum. Analysis criteria such as cut off heights and Z-widths provide judgment criteria for identification of resonant peaks.

Second derivative resonant ultrasound response analyzer

A simple and inexpensive device which is suited for real-time location of a fault occurring anywhere in a residential distribution system by analysis of the propogating fault signal considering the predetermined propagating velocity of the cable.

Advanced cable fault location

Growing community of inventors

Peralta, NM, United States of America

David E Thomas