Sensors/Data Acquisition

Wireless Sensing System Using Open-Circuit, Electrically Conductive Spiral-Trace Sensor

This low-profile inductance-capacitance sensor is suitable for small packaging.NASA Langley Research Center researchers have developed a wireless, low-profile sensor that uses a magnetic field response measurement acquisition system to provide power to the sensor and to acquire physical property measurements from it. Unique to this sensor is the shape of the electrical trace that eliminates the need for separate inductance, capacitance, and connection circuitry. This feature gives the sensor a smaller circuit footprint to enable a smaller, flexible, and easy-to-fabricate sensor package. The shape of the electrical trace can be readily modified to sense different physical properties. Also, arranging multiple low-profile sensors together can permit the wireless data acquisition system to read the responses from all the sensors by powering just one of them.

Posted in: Briefs, Sensors

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Variable Permeability Magnetometer Systems and Methods for Aerospace Applications

This technology exploits the varying permeability of a magnetic material with ambient magnetic fields.NASA's Langley Research Center has developed a magnetometer that takes advantage of the unique variable permeability properties of Metglas 2714A magnetic material. By measuring directly the inductive reactance of a simple right circular cylindrical search coil through the application of current from a high-output-impedance current source driven with a 10-kHz sinusoidal voltage, a magnetic field sensor having a 700-Hz bandwidth, good linearity, and excellent noise performance with sensitivity at least as good as the 0.1 nTesla range was produced.

Posted in: Briefs, Sensors

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Farzin Amzajerdian, Principal Investigator, Langley Research Center, Hampton, VA

Since 2003, Farzin Amzajerdian has worked on the Navigation Doppler Lidar (NDL), a sensor designed to support safe and precise vehicle landings on Mars and other destinations. The breadbox-sized NDL contains three lasers, a small electronics box, and lenses connected by fiber-optic cables. Amzajerdian will soon oversee the testing of the technology in California's Mojave Desert.

Posted in: Who's Who, Sensors

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Eddy Current System and Method for Crack Detection

This probe can identify outer surface damage from within the interior of installed hardware.NASA's Langley Research Center has developed a new eddy current inspection device that probes for cracks in parts of metal structures that are often inaccessible without extensive disassembly. The probe is specially designed for insertion into the cavity of a part to inspect the surrounding structure in an outward direction. For example, the probe may be held inside a large, thick tube and pointed outward to inspect the outer diameter of the tube. NASA used the probe to test for stress corrosion cracking in the relief radius of Space Shuttle thrusters without having to dismantle the hardware, reducing inspection time while ensuring the health of the structure. NASA Langley is seeking organizations that would like to license the probe to test for cracks in rocket thrusters and other metallic structures with hard-to-reach inspection areas.

Posted in: Briefs, Sensors

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Optical Fiber Sensors vs. Conventional Electrical Strain Gauges for Infrastructure Monitoring Applications

Public infrastructure, including bridges, pipelines, tunnels, foundations, roadways, dams, etc., is subject to factors that can degrade it or lead to malfunctions. These structural problems can be the result of deterioration, improper construction methods, seismic activity, nearby construction work, etc. Although electrical strain gauges have long been used for monitoring structural changes, they sometimes lack the durability and integrity necessary to provide accurate, actionable information over extended periods. The applications in this white paper demonstrate how optical fiber sensors can offer a variety of economic and performance advantages.

Posted in: White Papers, Fiber Optics, Optics, Sensors

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Radar Waveforms for A&D and Automotive Radar

There are many similarities between commercial radar and those used in defense electronics applications. The same technology used in high-end automobiles may be considered for autonomous vehicles and unmanned systems. However, one similarity that transcends the sensor application is choosing the right radar waveform.

Posted in: White Papers, Aerospace, Defense, Electronics, Electronics & Computers, Sensors

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Branimir Blagojevic, Technologist, Goddard Space Flight Center, Greenbelt, MD

During his time with former employer Science and Engineering Services, LLC, Branimir Blagojevic helped build a remote-sensing device that detected biological agents. The technology, originally made for the Department of Defense (DoD), may soon find a place on Mars. Blagojevic currently leads the development of the Bio-Indicator Lidar Instrument (BILI), a device that could be used to spot organic molecules and signs of life on Mars.

Posted in: Who's Who, Detectors

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