Test & Measurement

Instrumentation for Sensitive Gas Measurements

Measurements are based on cavity-enhanced absorption.

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Apparatus for Testing Flat Specimens of Thermal Insulation

An improved design affords flexibility for testing under diverse conditions.

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Quadrupole Ion Mass Spectrometer for Masses of 2 to 50 Da

H2, He, O2, and Ar can be quantitated at low concentrations in N2

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Miniature Laser Doppler Velocimeter for Measuring Wall Shear

Interference fringes are configured for sensitivity to a velocity gradient.

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Integrated Structural Analysis and Test Program

An integrated structural-analysis and structure-testing computer program is being developed in order to: • Automate repetitive processes in testing and analysis; • Accelerate pre-test analysis; • Accelerate reporting of tests; • Facilitate planning of tests; • Improve execution of tests; • Create a vibration, acoustics, and shock test database; and • Integrate analysis and test data.

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Synchrotron High-Speed Magnet Monitoring Using Ethernet-Based System

Synchrotron monitoring instruments that interface to Ethernet data communication systems can reduce cost and improve accuracy. Since the 1930s, synchrotrons have become essential in the widely diverse fields of scientific research and engineering development, including chemistry, biology, material science, and microelectronic engineering. Some synchrotron radiation applications include:

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Program Calculates Forces in Bolted Structural Joints

A FORTRAN 77 computer program calculates forces in bolts in the joints of structures. This program is used in conjunction with the NASTRAN finite-element structural-analysis program. A mathematical model of a structure is first created by approximating its load-bearing members with representative finite elements, then NASTRAN calculates the forces and moments that each finite element contributes to grid points located throughout the structure. The user selects the finite elements that correspond to structural members that contribute loads to the joints of interest, and identifies the grid point nearest to each such joint. This program reads the pertinent NASTRAN output, combines the forces and moments from the contributing elements to determine the resultant force and moment acting at each proximate grid point, then transforms the forces and moments from these grid points to the centroids of the affected joints. Then the program uses these joint loads to obtain the axial and shear forces in the individual bolts. The program identifies which bolts bear the greatest axial and/or shear loads. The program also performs a “fail-safe” analysis in which the foregoing calculations are repeated for a sequence of cases in which each fastener, in turn, is assumed not to transmit an axial force.

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