Test & Measurement

High Precision Multi-channel PXIe Systems Realize More Efficient Wind Tunnel Testing

Wind tunnel testing is widely used in large-scale aerodynamic design projects. Even so, the requirement for large numbers of sensors over large areas of the devices to be tested presents major challenges in data acquisition and retrieval. The article discusses use of multi-channel PXIe systems to achieve fully synchronous, high-efficiency, highly precise measurement solutions. Attributes include: PXIe technology providing effective single-system integration with multiple combinations of a wide variety of sensors PXIe platforms’ PC-based structure delivering easily deployed superior computing power along with networking capability, minimizing development time and simplifying setup

Posted in: Test & Measurement, White Papers

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How to Maximize Temperature Measurement Accuracy

Thermocouples are the most versatile and widely used devices for temperature measurements. Most test engineers are aware of the measurement errors caused by thermocouples but not always about the errors caused by the measurement system itself. This technical note will focus on the lesser known and important aspect called "Self-Calibration" and how it can be used to overcome errors in temperature measurement.

Posted in: Test & Measurement, White Papers

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Universal Mechanical Testers for Tribology Testing in the Automotive Industry

Universal mechanical testers provide tribology testing for friction, wear, coatings, and lubrication in macro, micro, and nano regimes. Bruker Nano Surfaces, Tucson, Arizona Very few industries are as affected by strict test standards as the automotive sector. Nearly every automobile component (engine parts, accelerators, clutches, brakes, tires, seatbelts, etc.) must exhibit adequate tribological properties in accordance with ASTM, DIN, JIS, ISO, and other comprehensive international standards. Universal mechanical testers (UMTs) that are able to perform multiple tests in a single platform with interchangeable modules can help manufacturers meet test specifications quickly and economically. For example, crankshafts and camshafts have critical requirements for proper functioning under diverse service conditions. Tests include evaluation of base materials, heat-treated parts, surface coatings, and lubricants. Tests can be run with diverse loads, velocities, and temperatures that simulate actual service conditions using various lubricants and liquids.

Posted in: Mechanical Components, Test & Measurement, Briefs

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Photogrammetric Recession Measurement

This method can be used to measure the recession of ablative materials in insulation coatings, ceramics and composites, arc-jet systems, and soil erosion. Ames Research Center, Moffett Field, California The testing of materials that ablate as a design function requires detailed time history of the ablation process. The rate at which the surface recedes during testing is a critically important measure of the performance of thermal protection system (TPS) materials like heat shields for aerospace vehicles. Photogrammetric recession measurement (PRM) meets these needs by recording the surface of the ablating model during heating in hyperthermal test facilities (arc-jets), using two high-resolution digital cameras capable of recording simultaneously. The cameras are calibrated to yield three-dimensional object space measurement for each stereo pair of images, producing surface recession data over the portion of the model for which both cameras share a view.

Posted in: Physical Sciences, Test & Measurement, Briefs

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Tissue-Equivalent Radiation Dosimeteron-a-Chip with Plastic Scintillation Material

This innovation uses solid-state technology to create a compact, lightweight, personal space radiation monitor. Lyndon B. Johnson Space Center, Houston, Texas The complexity of spaceflight design requires reliable, fault-tolerant equipment capable of providing real-time dosimetry during a mission, which is not feasible with existing thermoluminescent dosimeter (TLD) technology. Real-time monitoring is important for low-Earth-orbiting spacecraft and interplanetary spaceflight to alert the crew when solar particle events (SPE) increase the particle flux of the spacecraft environment. In this innovation, the personal dosimeter is comprised of a tissue-equivalent scintillator coupled to a solid-state photomultiplier.

Posted in: Physical Sciences, Test & Measurement, Briefs

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Measurement of Cryogenic Fluid Level with Laser Propagation and Surface Floor Reflection

The current float sensing system can be augmented with this new development. Stennis Space Center, Mississippi The risks associated with introducing new hardware and methods into an operational environment have in part prohibited cryogen level measurement technology from advancing. In prior art, measurements have been made with invasive probes immersed in the cryogenic fluid. Implementing this approach would require physical retrofitting, as well as requiring the measuring instrument to make contact with the harsh cryogen fluid environment. However, an externally mounted optical measurement system would mitigate these concerns. Therefore, an optical approach was developed that uses and augments existing validated technology in a manner that does not interfere with the current infrastructure.

Posted in: Physical Sciences, Test & Measurement, Briefs

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Video Acuity Measurement System

The smallest letters that can be automatically identified are used to rate the video system. Ames Research Center, Moffett Field, California There is a widely acknowledged need for metrics to quantify the performance of video systems. Existing metrics are either difficult to measure or are largely theoretical. They do not reflect the full range of effects to which video may be subject, or do not relate easily to video performance in real-world tasks. The empirical Video Acuity metric is simple to measure and relates directly to task performance. Video acuity is determined by the smallest letters that can be automatically identified using a video system. It is expressed most conveniently in letters per degree of visual angle.

Posted in: Physical Sciences, Test & Measurement, Briefs

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White Papers

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Navigating the Intellectual Property Roadblocks to Open Innovation
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How to Choose the Right Sensor for Your Measurement System
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