Test & Measurement

Estimation of Algae Growth Stage, Growth Rate, and Lipid Content

Applications include diesel fuel production, renewable energy, biofuels, and pharmaceuticals.

This invention provides a method using light of different wavelengths to estimate freshwater and marine algae growth stage and algae growth rates as well as lipid content in standard media. Light absorption by the algae is measured for a specified light intensity in each of two or more narrow wavelength ranges, correcting for absorption in the medium without algae. The net light absorption is compared with a reference set of absorption values for the algae at different growth stages.

Posted in: Briefs, Test & Measurement, Measurements, Biomaterials, Materials properties, Test procedures, Marine vehicles and equipment

Isotopic Biomarkers for Rapid Assessment of Bone Mineral Balance in Biomedical Applications

Advanced isotope tracer techniques are explored.

Lyndon B. Johnson Space Center, Houston, Texas

Development of new treatments for metabolic bone disease, and evaluation of the effectiveness of existing therapies in individual patients, are severely hampered by the lack of any reliable tool for quickly measuring changes in bone mineral balance in response to treatment. A new tracerless calcium isotope biomarker of bone mineral balance fills this need. When properly applied, the calcium isotope biomarker reveals changes in bone mineral balance with unprecedented speed and detail, and has the potential to dramatically improve the treatment for diseases such as osteoporosis. A complementary strontium isotope biomarker provides, with equal rapidity, information on the speed of exchange of calcium between soft tissue and mineralized compartments.

Posted in: Briefs, Test & Measurement, Measurements, Biological sciences, Diseases, Medical equipment and supplies, Calcium

Optically Modulated Miniature Magnetometer

This instrument may replace two separate instruments that are often needed together to study magnetic fields.

Goddard Space Flight Center, Greenbelt, Maryland

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 alkali vapor scalar magnetometer. For all vector instruments, the scalar data is necessary for calibrating the vector data.

Posted in: Briefs, TSP, Test & Measurement, Optics, Magnetic materials, Test equipment and instrumentation

Rapid Infrared Pixel Grating Response Testbed

A test array has been developed to measure the response of pixel-integrated infrared gratings over a wavelength range from 3 to 13 μm for multiple grating geometries. This array allows for testing and for determining the performance of an infrared focal plane array camera before resources have been committed to the design and fabrication of the final array.

Posted in: Briefs, TSP, Test & Measurement, Optics, Test equipment and instrumentation

JWST Integrated Simulation and Test (JIST) Core

Modeling techniques and hardware models have potential commercial applications for projects that deploy similar solutions.

The James Webb Space Telescope (JWST) Integrated Simulation and Test (JIST) environment is a software-only system simulator that provides an environment to exercise JWST flight software subsystems and interfaces. JIST is capable of executing the unmodified flight software binaries in an operational environment that can be configured on a single personal computer. JIST utilizes the JWST ground system, ground system command and telemetry databases, simulated flight computers, instrument simulators, and environment simulators. Some of the capabilities provided by JIST include the ability to load and run any version of the flight software, inject errors (faults) from ground system test procedures, save simulation state (processor and simulators), and simulate external hardware devices. Many components are potentially reusable on future missions. In addition, the modeling techniques and models have potential commercial applications for projects that deploy similar hardware solutions.

Posted in: Briefs, TSP, Test & Measurement, Computer simulation, Flight control systems, Test equipment and instrumentation

JWST IV&V Simulation and Test (JIST) Solid State Recorder (SSR) Simulator

Dynamic analysis capabilities are provided with no hardware in the loop.

As described in “JWST Integrated Simulation and Test (JIST) Core” (GSC-16739-1) on page 25, the JIST system is a software-based simulator that uses the James Webb Space Telescope (JWST) operational ground system, ground system command/telemetry databases, simulated flight computers, and unmodified flight software binaries to provide dynamic analysis capabilities. There is no hardware in the loop; the flight software communicates over a simulated MIL-STD-1553 and Spacewire port. The JIST SSR Simulator is a reusable component of the JIST system, and is responsible for simulating basic SSR functionality.

Posted in: Briefs, TSP, Test & Measurement, Computer simulation, Flight control systems, Test equipment and instrumentation

Temperature Measurement and Stabilization in a Birefringent Whispering Gallery Resonator

Applications include optical clocks, spectroscopy, and optical transponders.

Whispering gallery mode (WGM) res- onators have been suggested for use as reference cavities for laser stabilization. Because of their unique properties (small size, high stability, narrow line width), such application appears to hold great promise. It is expected to allow for the exceptionally high optical frequency stability.

Posted in: Briefs, TSP, Test & Measurement, Optics, Sensors and actuators, Thermal management

Automation in Display Testing

This method reduces time and effort, and solves limitations involved in testing multiple displays.

Display devices play a vital role as the man-machine interface in most embedded domains. Display systems provide information regarding the health of safety-critical subsystems and the general status of the machine. Accuracy and precision of the information displayed is a key factor in proper machine operation. Hence, display systems need to be tested meticulously before they are delivered to the customer.

Posted in: Briefs, Test & Measurement, Computer simulation, Human machine interface (HMI), Displays, Test procedures

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.