Friction Tester

Paul N. Gardner Co. (Pompano Beach, FL) offers a compact CFT friction tester that provides detailed information of the slip characteristics of packaging material. Surface slip is a key factor when printing, erecting, or filling packaging materials on an automatic line. The CFT measures both static and dynamic coefficients of friction. A sample of 2.5 × 2.5" with a weight acting over the entire surface area is moved over another sample at a given speed. Static and dynamic coefficients of friction (COF) are automatically calculated and displayed on-screen. Features include graphical representation of forces during test, and pre-loaded ISO/ASTM/TAPPI test methods.

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Posted in: Products, Manufacturing & Prototyping, Test & Measurement

Signal Analyzer

The MS2840A signal analyzer from Anritsu (Richardson, TX) features frequency coverage of 9 kHz to 44.5 GHz and close-in SSB phase noise performance. Frequency coverage can be extended to the millimeter wave (mmWave) range. The analyzer can conduct wideband and narrowband measurements on next-generation 4G/5G designs, micro wave and mmWave wireless backhaul, 79 GHz band automobile radar, satellite communications, and VHF/UHF Private Mobile Radio (PMR). The unit’s oscillator achieves phase noise performance of –123 dBc/Hz at 1 GHz measurement frequency, and 10 kHz offset frequency.

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Posted in: Products, Manufacturing & Prototyping, Test & Measurement

Using PXI to Build a High-Performance MEMS Microphone Testing System

The demand for increasing microphone signal quality from handheld mobile devices has led to the development of microphone signal processing technologies such as: HD audio, noise cancellation, active noise cancellation, beam forming, directional reception, stereo sound field reconstruction, and speech recognition. As well, devices incorporating multiple microphones are becoming more and more popular. Several newly released smart phones now integrate multiple MEMS (Micro Electrical-Mechanical System) microphones for improved background noise cancellation. All flagship smart phone models in introduced in 2015 featured three or more MEMS microphones to support HD audio, ambient noise cancellation, noise filtering, directional reception and speech recognition. Popularity of MEMS microphones is expected to grow.

Posted in: White Papers, Electronics, Data Acquisition, Sensors, Test & Measurement

Hermetic Seal Leak Detection Apparatus with Variable Size Test Chamber

A streamlined, cost-effective, sensitive approach to detecting leaks in hermetic seals.

NASA’s Marshall Space Flight Center has developed a unique apparatus ideal for use in nondestructive testing (NDT) of hermetic seals of containers or instrumentation. The device is capable of detecting both large and small leaks and can be calibrated to characterize the relative leak rate. Its simple design does not require specialized gases for pressurization and detection, and eliminates the need for expensive instrumentation such as a mass spectrometer to analyze leaks and achieve high sensitivity. Low in cost and simple to manufacture, the patent-pending technology is ideal for use in many industries, from aerospace applications to food packaging and commercial goods.

Posted in: Briefs, Test & Measurement, Containers, Seals and gaskets, Non-destructive tests, Test equipment and instrumentation

Extreme Low Frequency Acoustic Measurement System

This system detects and locates atmospheric clear air turbulence and severe weather.

NASA’s Langley Research Center has developed a system to detect and locate atmospheric clear air turbulence (CAT) by means of a ground-based infrasonic array to serve as an early warning system for aircraft. This system could augment existing systems such as pilot reports (PIREPs), airborne lidar, and airborne radar. The NASA system offers a benefit since the existing electromagnetic methods lack targets at 30,000-40,000 feet and will not detect CAT. Because CAT and severe storms emit infrasound that propagates over vast distances through the Earth’s atmosphere, the Langley system offers an excellent early warning opportunity. The system has been able to detect known events — such as detection of the launch of the Space Shuttle in Florida all the way from Virginia. It also has correlated data with NOAA’s PIREPs information.

Posted in: Briefs, Test & Measurement, Measurements, Weather and climate, Acoustics, Turbulence

Low-Temperature Radiometer

This technology can look for heat leaks and reflected flux in low-temperature thermal vacuum systems.

Many present and future NASA missions require high-performance, large-scale cryogenic systems, such as the sunshields and cold instruments for the James Webb Space Telescope (JWST). Testing these systems is problematic because of both the size and the low heat loads allowed. The heat loads can be greatly influenced by non-ideal blackbody characteristics of the test chamber, and by stray heat from warmer parts of the system and ground support equipment. Previously, stray thermal energy was not directly measured, but inferred from deviations in the expected results, which leads to errors in thermal modeling and in lack of knowledge of the thermal performance of the item under test. Technologists at NASA Goddard Space Flight Center have developed a radiometer to help identify the sources of stray heat and to make non-contact thermal emission measurements of such materials as vapor-deposited aluminum on Kapton and multilayer insulation blankets, as well as background measurements of non-ideal chamber effects such as light leaks and radiation bounces.

Posted in: Briefs, Test & Measurement, Optics, Radiation, Thermal testing, Satellites

Lightweight Internal Device to Measure Tension in Hollow-Braided Cordage

This device has applications in industries commonly using cordage, such as shipping, sailing, and lifting.

The suspension system of parachutes is typically made from ropes (referred to as cordage). Measuring loads in the suspension system cordage has thus far proven very challenging because of the dynamic nature of the parachute. The suspension lines must be deployed along with the parachute, and experience rapid acceleration and dynamic motion as the parachute inflates. The addition of bulky load cells to the suspension lines would change the dynamics of the system and corrupt the data.

Posted in: Briefs, Test & Measurement, Suspension systems, Measurements, Fibers, Tensile Strength

Improved Method to Quantify Leak Rates

This method improves the quality and reliability of leak rate test results.

One existing method to quantify the gas loss from a closed system is the mass point leak rate method. This traditional empirical method is capable of quantifying the loss of a known type of gas from a volume of known size. Using this method, measurement devices quantify the gas pressure and temperature within a closed system throughout the duration of the test. At the onset of the test, the operator establishes boundary conditions to create a pressure differential across the test article that is higher than the pressure differential of interest. During the test, the pressure differential decreases due to leakage. When the operator subjectively determines that the desired pressure differential has been achieved and sufficient data has been collected, the test is stopped. Subsequently, the data analyst identifies a subset of the collected data to be used for mass loss computations. A typical computation utilizes a linear fit of the mass-time data set, wherein the slope of the line is the mass loss rate. It is common to use the largest data subset to minimize the measurement uncertainty; however, the data set must not be so large that the curve fit is nonlinear.

Posted in: Briefs, Test & Measurement, Mathematical analysis, Gases, Test procedures

Flight Test System for Accurately Predicting Flutter

Traditional methods of flight flutter testing analyze system parameters such as damping levels that vary with flight conditions to monitor aircraft stability. In the past, the actual flight envelope developed for aircraft operation was essentially determined only by flight testing. The edges of the envelope are points where either the aircraft cannot fly any faster because of engine limitations, or, with a 15% margin for error, where the damping trends indicate a flutter instability may be near. After flight testing, the envelope empirically determined is used for regular operations.

Posted in: Briefs, Test & Measurement, Vibration, Flight tests, Performance tests

TestEVAL Software to Assist in Mechanical Testing

Typically, mechanical test data has been reviewed and processed using a combination of Excel, PDF Viewer, MATLAB, and other tools. TestEVAL provides a central tool for all these tools, and enhances their capability. Having been developed in Python, it is expendable and portable. It uses no proprietary software and an all open-source code base.

Posted in: Briefs, Test & Measurement, Computer software and hardware, Data management, Test equipment and instrumentation

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