Test & Measurement

Nanofabricated Devices Detect Ultrasound with Light

Tiny, soft, transparent, nanofabricated devices can be integrated into a contact lens.

The Micro-ring resonator detector can determine the speed of blood flow and the oxygen metabolic rate at the back of the eye. This information could help diagnose such common and debilitating diseases as macular degeneration and diabetes. The tiny, transparent device can fit into a contact lens, and could help a range of scientific endeavors from biomedicine to geology.

Posted in: Briefs, Test & Measurement, Optics, Sensors and actuators, Optics, Sensors and actuators, Diagnosis, Medical equipment and supplies, Fabrication, Nanotechnology

Bio-Detection System is a Handheld Chemistry Lab

The device miniaturizes bench-scale analyses in a handheld, low-power device.

Devices for manipulating fluids on the microscale have been developed to store, hold, and manipulate small amounts of fluids, and have been applied to the detection of analytes in sample fluids. Manipulating fluids and performing capillary electrophoresis in microfluidic devices promises advantages of small size, high throughput, low sample volumes, and low cost.

Posted in: Briefs, Test & Measurement, Sensors and actuators, Sensors and actuators, Bacteria, Biological sciences, Chemicals, Materials identification

Impedance Measurement Box

This tool provides single-point measurement of batteries.

The dependability of energy storage devices — particularly batteries — is becoming increasingly important to consumers, industry, and the military. As battery technology becomes more complex and users' expectations become more pronounced, there is a pressing need for highly accurate assessment techniques that can give state-of-health readings in conditions approaching real time.

Posted in: Briefs, Test & Measurement, Measurements, Energy storage systems, Energy storage systems, Electric power, Test equipment and instrumentation, Test procedures

Transducer-Actuator Systems for On-Machine Measurements and Automatic Part Alignment

These systems have applications in machine shops, and in automotive and aircraft parts and manufacturing.

When performing machine tool setup and maintenance operations, it is frequently necessary to use a position transducer to “sweep” a surface and establish its relationship to a machine. A machine operator or maintenance technician typically attaches a position indicator to one portion of a machine, and then sweeps the position transducer over the object of interest, while observing the indicator run-out. If necessary, multiple adjustments and re-checks are made to the position of the object to obtain the desired alignment condition.

Posted in: Briefs, Test & Measurement, Measurements, Sensors and actuators, Sensors and actuators, Automation, Manufacturing equipment and machinery, Parts

Paper-Based Electrochemical Test Strip Detects Harmful Bacteria

This test could eliminate the need for more expensive follow-up tests.

Borrowing concepts from medical diagnostic devices, researchers have created a simple, inexpensive set of handheld tests that can detect the presence of many water- or food-borne pathogens. If applied in the field, such tests could greatly reduce the number of expensive follow-up tests needed to keep the food supply safe from fecal contamination.

Posted in: Briefs, Test & Measurement, Sensors and actuators, Sensors and actuators, Bacteria, Human factors

In-Situ Load System for Calibrating and Validating Aerodynamic Properties of Scaled Aircraft in Ground-Based Aerospace Testing Applications

ILS improves testing accuracy, repeatability, time in tunnel, and many aspects of the calibration process.

The in-situ load system (ILS) provides the ground-testing community with a comprehensive tool that permits system-level calibration and validation of force measurement systems in a test-like environment. It was developed to improve testing accuracy, repeatability, time in tunnel, and many aspects of the calibration process. The key innovations are that ILS enables a system calibration (rather than independent subsystem and component calibrations) by using the one-force-vector calibration approach and a statistically defensible estimate total force measurement uncertainty. ILS may be applied in any wind tunnel facility, private or government.

Posted in: Briefs, Aerospace, Test & Measurement, Calibration, Test equipment and instrumentation, Wind tunnel tests, Aerodynamics

Photo-Acoustic Chemical Detector

This technology could be used for the detection of explosives and hazardous or toxic chemicals.

NASA's Langley Research Center has developed a photo-acoustic sensing-based laser vibrometer for the measurement of ambient chemical species. The technology allows for detection of sub-part-per-billion (ppb) levels of ambient trace gases and chemical species, with an order of magnitude more sensitivity than similar technologies. Among other applications, the technology could be used for the detection of explosives and hazardous or toxic chemicals.

Posted in: Briefs, Sensors, Instrumentation, Test & Measurement, Lasers, Lasers, Chemicals, Vibration, Vibration, Hazardous materials, Test equipment and instrumentation

Reliability Testing of High-Power Devices

Before a new high-power semiconductor device can be used for industrial applications, it must be thoroughly tested to determine if it will survive environmental stresses and continue to meet specifications. This is especially true for the latest wide-bandgap semiconductor materials such as silicon carbide (SiC) and gallium nitride (GaN) to ensure they can withstand high voltage and temperatures.

Posted in: Briefs, Test & Measurement, High voltage systems, High voltage systems, Semiconductors, Reliability, Reliability, Test procedures, Thermal testing

Electronic Device Monitors the Heart and Recognizes Speech

Researchers from the University of Colorado Boulder and Northwestern University have developed a tiny, soft, and wearable acoustic sensor that measures vibrations in the human body, allowing them to monitor human heart health and recognize spoken words. The stretchable device captures physiological sound signals from the body, has physical properties matched with human skin, and can be mounted on nearly any surface of the body. The sensor resembles a small Band-Aid®, weighs less than one-hundredth of an ounce, and can gather continuous physiological data.

Posted in: Briefs, Test & Measurement, Measurements, Cardiovascular system, Prostheses and implants, Acoustics, Vibration, Acoustics, Vibration

Split Laser System for Environmental Monitoring

Environmental monitoring — the assessment of air, water, and soil quality — is highly important to oil and gas exploration companies, landowners, regulatory agencies, municipalities, and any organization measuring emissions and pollutants. The majority of monitoring technologies, however, are expensive and labor intensive, often requiring sample collection and preparation (i.e., external lab analysis) that can dramatically alter the sample and its inherent components. Of those technologies that do allow for in-situ analysis, few are amenable to measurements under harsh conditions, such as high temperature and/or pressure.

Posted in: Briefs, Test & Measurement, Lasers, Lasers, Environmental testing, Test equipment and instrumentation, Test procedures

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