Test & Measurement

Briefs : Test & Measurement
Live-Cell Microscopy and Traction Force Measurements with Simulated Microgravity “Clinochip”

The deleterious effects of microgravity are undeniable: reduced bone mineral density, muscle atrophy, vascular remodeling, etc. These health issues may derive from both systemic factors, and from direct alterations to intracellular components and in...

Briefs : Test & Measurement
Comparison of Three Methods for Measuring Distortion in Optical Windows

The primary function of a window is to allow observation of, and protection from, a potentially hazardous environment. Yet, from the window designer’s point of view, ensuring protection from weather conditions in home windows; from wind, temperature, and airborne debris in...

Briefs : Test & Measurement
Improved Combustion Products Monitor for the ISS

Fire safety in space vehicles is of utmost importance, especially for manned flight. On the International Space Station (ISS), events that may lead to fires, especially smoldering, must be detected quickly and their location found. The analyzer used on the ISS must be automated, portable, and...

Briefs : Test & Measurement
Vector Network Analyzer Calibration for Quasi-Optical Dual Ports

It is desirable to measure the electromagnetic properties of devices and materials in the millimeter part of the spectrum. For guided wave-based devices and materials (waveguides, coaxial devices), a vector network analyzer (VNA) is an excellent tool for this purpose since it...

Briefs : Test & Measurement
Optically Modulated Miniature Magnetometer

The optically modulated miniature magnetometer (OMMM) is intended to replace two separate instruments (each with their respective mass and power allotments) that are commonly needed together for scientific studies of magnetic fields — a triaxial fluxgate vector magnetometer and an optically pumped...

Briefs : Test & Measurement
Quantitative Analysis of Failure Mode in Adhesively Bonded Test Specimens

After adhesively bonded mechanical test specimens have been tested to failure, the failure mode must be interpreted and quantified. Areas of the adherent that are bare (no residual adhesive remains) have undergone adhesive failure. The remainder of the surface has...

Briefs : Test & Measurement
Neutron Spectrometer for Inner Radiation Belt Studies

The Earth’s magnetosphere offers a wealth of information on particle dynamics, acceleration, and trapping. Fast neutrons, produced in the Earth’s atmosphere by the impact of galactic cosmic rays (GCRs) and solar energetic particles (SEPs), are an important but poorly measured component of...

Briefs : Test & Measurement
Variable Acceleration Force Calibration System

A variable acceleration calibration system combines an innovative mechanical system and a statistical design of experiments to calibrate multi-axis force transducers. This system can reduce calibration time, allow for improved calibration of large-scale transducers, provide mobility for on-site...

Briefs : Test & Measurement
A Synthetic Quadrature Phase Detector/ Demodulator for Fourier Transform Spectrometers

Fourier transform spectroscopy works by measuring a spectral/light signal through a Michelson interferometer. In order to know the wavelength of the signal, one must use a stable reference, which is typically a metrology laser. In a standard Fourier transform...

Briefs : Data Acquisition
Sampling Mechanism for a Comet Sample Return Mission

Sample return missions have the ability to vastly increase scientific understanding of the origin, history, current status, and resource potential of solar system objects including...

Briefs : Test & Measurement
Low Er-Doped Yttrium Gallium Garnet (YGG) as Active Media for Solid-State Lasers at 1651 nm

The typical approach for producing laser output at the 1651-nm wavelength is via nonlinear frequency conversion. Lasers based on nonlinear conversion are complex, and it is very difficult to provide stability over time and over a wide range of operating...

Briefs : Test & Measurement
Dual-Cavity Rayleigh Scattering Measurement System

Molecular-based optical diagnostics techniques capable of obtaining simultaneous measurements of multiple fluid properties are critically important for characterizing hypersonic air-breathing engines, such as scramjet engines and scramjet-rocket combined cycle engines. Correlations between those...

Briefs : Test & Measurement
Miniature Laser Magnetometer

Space missions using magnetometers have been very successful. However, science missions now require higher levels of accuracy and stability in order to refine existing understanding and improve modeling. In most space missions that require high-accuracy vector measurement of magnetic fields, a separate scalar...

Briefs : Test & Measurement
Negative-Ion Time Projection Chamber Polarimeter for Measuring Polarization of Bright Transient Astrophysical Sources

A negative ion time projection chamber (NI-TPC) was developed that is suitable for measuring the polarization of bright transient events. The polarization of the astrophysical source is determined by imaging photoelectron tracks...

Briefs : Photonics/Optics
Nonlinear Swept Frequency Technique for CO2 Measurements Using a CW Laser System

The U.S. National Research Council recently identified the need for a near-term space mission of Active Sensing of CO2 Emissions over Nights, Days, and Seasons (ASCENDS). The primary objective of the ASCENDS mission is to make CO2 column...

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