Test & Measurement

Hydrometeor Size Distribution Measurements by Imaging the Attenuation of a Laser Spot

Measurement of the DSD’s second moment is made by way of the Beer-Lambert law. The optical extinction of a laser due to scattering of particles is a well-known phenomenon. In a laboratory environment, this physical principle is known as the Beer-Lambert law, and is often used to measure the concentration of scattering particles in a fluid or gas. This method has been experimentally shown to be a usable means to measure the dust density from a rocket plume interaction with the lunar surface. Using the same principles and experimental arrangement, this technique can be applied to hydrometeor size distributions, and for launch-pad operations, specifically as a passive hail detection and measurement system.

Posted in: Test & Measurement, Briefs, TSP


Victim Simulator for Victim Detection Radar

This simulator can be placed for long periods of time in environments that would be unsafe for a human subject. Testing of victim detection radars has traditionally used human subjects who volunteer to be buried in, or climb into a space within, a rubble pile. This is not only uncomfortable, but can be hazardous or impractical when typical disaster scenarios are considered, including fire, mud, or liquid waste. Human subjects are also inconsistent from day to day (i.e., they do not have the same radar properties), so quantitative performance testing is difficult. Finally, testing a multiple-victim scenario is difficult and expensive because of the need for multiple human subjects who must all be coordinated.

Posted in: Test & Measurement, Briefs, TSP


Hybrid and Electric Vehicle Test System

SAKOR Technologies, Inc. (Okemos, MI) designed and installed a complete turnkey Hybrid and Electric Vehicle Test System for UQM Technologies, Inc. (Longmont, CO), a manufacturer of high-efficiency electric propulsion systems. UQM will use the system to test inverters and traction motors for use in hybrid and electric vehicles for the automotive, commercial truck, bus, and military markets.

Posted in: Products, Batteries, Electronics, Power Management, Power Supplies, Energy Efficiency


Beat-to-Beat Blood Pressure Monitor

This invention is applicable to all segments of the blood pressure monitoring market, including ambulatory, home-based, and high-acuity monitoring. This device provides non-invasive beat-to-beat blood pressure measurements and can be worn over the upper arm for prolonged durations. Phase and waveform analyses are performed on filtered proximal and distal photoplethysmographic (PPG) waveforms obtained from the brachial artery. The phase analysis is used primarily for the computation of the mean arterial pressure, while the waveform analysis is used primarily to obtain the pulse pressure. Realtime compliance estimate is used to refine both the mean arterial and pulse pressures to provide the beat-to-beat blood pressure measurement.

Posted in: Bio-Medical, Test & Measurement, Briefs, Patient Monitoring, Measuring Instruments, Monitoring


Magnetic Testing Technique Helps Ensure Reliability of PV Cells

Making use of the force generated by magnetic repulsion, Georgia Tech researchers have developed a new technique for measuring the adhesion strength between thin films of materials used in microelectronic devices, photovoltaic cells, and microelectromechanical systems (MEMS).

Posted in: News, News, Renewable Energy, Solar Power


New 3D Designs Double Solar Power

A team of MIT researchers is building cubes or towers that extend solar cells upward in three-dimensional configurations. The results from the structures they’ve tested show power output ranging from double to more than 20 times that of fixed flat panels with the same base area.

Posted in: News, News, Computers, Energy Efficiency, Renewable Energy, Solar Power


PDC Drill Bits Open Up Options for Geothermal Energy

Nearly two-thirds of the oil we use comes from wells drilled using polycrystalline diamond compact (PDC) bits, originally developed 30 years ago to lower the cost of geothermal drilling. Sandia National Laboratories and the U.S. Navy recently brought the technology full circle, showing how geothermal drillers might use it.

Posted in: News, News, Geothermal Power, Renewable Energy, Machinery & Automation


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