Test & Measurement

A Brief History of Modern Digital Shaker Controllers

This article discusses four generations of digital vibration exciter control systems developed by U.S. companies over a period of 40 years. The controllers are categorized as standalone, PC-based, PC-tethered, and fully networked.

Posted in: Test & Measurement, White Papers, White Papers

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Improving Fidelity of Noise Repetitive Signals with Signal Averaging Technology

For many high-speed data acquisition applications requiring extraction of small repetitive signals from noisy environments, such as LIDAR or optical fiber testing, minimizing the effects of noise is a challenge for system design. Signal averaging provides dependable and efficient results. The article illustrates how FPGA-based signal averaging technology processes signals and reduces noise effects, improving signal-to-noise ratio (SNR) without occupying valuable CPU bandwidth.

Posted in: White Papers

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Enabling Microliquid Chromatography by Microbead Packing of Microchannels

The microbead packing is the critical element required in the success of onchip microfabrication of critical microfluidic components for in-situ analysis and detection of chiral amino acids. In order for microliquid chromatography to occur, there must be a stationary phase medium within the microchannel that interacts with the analytes present within flowing fluid. The stationary phase media are the microbeads packed by the process discussed in this work. The purpose of the microliquid chromatography is to provide a lightweight, low-volume, and lowpower element to separate amino acids and their chiral partners efficiently to understand better the origin of life.

Posted in: Imaging & Diagnostics, Materials / Adhesives / Coatings, Monitoring & Testing, Optics/Photonics, Bio-Medical, Briefs, TSP, Briefs, TSP, Diagnostics, Fluid Handling, Measuring Instruments

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Cogging Torque Analysis of a Permanent Magnet Machine in a Wind Turbine

Finite element analysis is used to analyze the effects of different designs on the reduction of cogging torque. Permanent magnet machines are used in many industrial applications because of their ability to produce high power densities. The market for such machines has been expanding due to the availability of affordable magnet materials, technological improvements, and advances in design and control. While still a relatively new phenomenon in wind turbines, permanent magnet generators are increasingly the focus of R&D in that field.

Posted in: Test & Measurement, Briefs

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Fast, High-Precision Readout Circuit for Detector Arrays

The GEO-CAPE mission described in NASA’s Earth Science and Applications Decadal Survey requires high spatial, temporal, and spectral resolution measurements to monitor and characterize the rapidly changing chemistry of the troposphere over North and South Americas. High-frame-rate focal plane arrays (FPAs) with many pixels are needed to enable such measurements.

Posted in: Test & Measurement, Briefs, TSP

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A System for Measuring the Sway of the Vehicle Assembly Building

Tests have shown that the existing facility is safe. A system was developed to measure the sway of the Vehicle Assembly Building (VAB) at Kennedy Space Center. This system was installed in the VAB and gathered more than one total year of data. The building movement was correlated with measurements provided by three wind towers in order to determine the maximum deflection of the building during high-wind events.

Posted in: Test & Measurement, Briefs, TSP

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ISS Ammonia Leak Detection Through X-Ray Fluorescence

An astrophysics instrument can be used to detect and localize ISS ammonia leaks. Ammonia leaks are a significant concern for the International Space Station (ISS). The ISS has external transport lines that direct liquid ammonia to radiator panels where the ammonia is cooled and then brought back to thermal control units. These transport lines and radiator panels are subject to stress from micrometeorites and temperature variations, and have developed small leaks. The ISS can accommodate these leaks at their present rate, but if the rate increased by a factor of ten, it could potentially deplete the ammonia supply and impact the proper functioning of the ISS thermal control system, causing a serious safety risk.

Posted in: Test & Measurement, Briefs, TSP

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White Papers

Aqueous Critical Cleaning: A White Paper
Sponsored by Alconox
Free Guide to High Performance Switching
Sponsored by Keithley
3D Printing and the Future of Manufacturing
Sponsored by Stratasys
Performance Characteristics of Digital Frequency Discriminators
Sponsored by Wide Band Systems
How Lean Manufacturing Adds Value to PCB Production
Sponsored by Sunstone Circuits
Adhesives, Sealants & Coatings for the Aerospace Industry
Sponsored by master bond

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