A Detector for Sub-Surface Cracks (open access)

A Detector for Sub-Surface Cracks

From abstract: "An instrument was developed to detect cracks within 1/8 inch of the surface of cylindrical uranium fuel slugs. The instrument measures changes in eddy currents that are induced at a frequency of 2 KC."
Date: August 1954
Creator: Goodwin, L. E.
System: The UNT Digital Library
Ultrasonic Fusion Joining of Sintered Aluminum Powder Materials to Aluminum Alloys (open access)

Ultrasonic Fusion Joining of Sintered Aluminum Powder Materials to Aluminum Alloys

From abstract: "Essentially void-free fusion-type joints of high strength were produced between small specimens of Type M-276 sintered aluminum powder plate and 1100 Hl4 wrought plate, using a technique consisting of controlled and brief exposure of the ends of both materials to an ultrasonically active coupler face in a bath of molten 1100 aluminum, followed immediately by butt joining and fast cooling. With further development, the process should be adaptable to other types of sintered aluminum powder materials and to other joint geometries."
Date: August 1958
Creator: Thomas, John G. & Meyer, Florence R.
System: The UNT Digital Library
Nonlinear Analogue to Digital Converter (open access)

Nonlinear Analogue to Digital Converter

Technical report. From Abstract: "An electromagnetical instrument is described which produces a shaft rotation which is a linear function of the quantity being measured from a non-linear input signal. The instrument was used to convert the output function of the Nuclear Test Gage (NTG) which is nonlinear with respect to fuel concentration to a form that will directly drive an automatic production recorder (APR). The output shaft is also geared to a Veeder Root counter so that the value of the independent variable is given to the NTG operator in digital form. A rate-of-change detector automatically trips the APR when the reading has come sufficiently close to equilibrium."
Date: August 1959
Creator: Goodwin, Leslie E.
System: The UNT Digital Library