Sensors/Data Acquisition

Compact Active Vibration Control System

This system provides active damping of flexible structures using a simple and compact actuator, sensor, and control system.

NASA Langley Research Center has developed a point sensor and piezoelectric actuator system to actively sense and reduce vibrations in flexible structures. The system uses a directional piezoelectric actuator that couples to an underlying structure like four point forces acting normal to the structure. Four miniature accelerometers are located coincident with the piezoelectric point forces to create a matched actuator/sensor pair. This matched pair enables feedback control to be implemented using simple, robust, negative feedback that requires no knowledge of the dynamics of the structure, and can be implemented using analog electronics. When attached to a flexible structure, this active damping system can reduce vibrations in a variety of applications. Compared to other systems, this approach offers good performance with a simple and compact control system.

Posted in: Briefs, Sensors

Self-Assembling, Reversible, Reagentless Biosensor

Applications include pathogen detection, industrial monitoring, chemical detection, and healthcare and drug discovery.

Recognition-based biosensors capable of specifically detecting chemicals, toxins, and bio-agents in their environment are of increasing importance. An important goal in biosensor evolution is production of nanoscale assemblies capable of continuously monitoring concentrations of target species in a simple, reliable manner. This is accomplished by designing sensor components to carry out analyte recognition and binding while simultaneously producing useful output signals via an integrated signal transduction system. Optically addressed biosensors of this type often employ fluorescence resonance energy transfer (FRET) in signal transduction. FRET has been employed in carefully designed sensing systems for proteins, peptides, nucleic acids, and other small molecules.

Posted in: Briefs, Sensors

Chip-Based Power Measurement Sensor

These sensors could be deployed in bulk, both on land and in space.

Phone signals spend at least some time traveling over fiber-optic cables. To ensure that the information gets where it needs to go, and to help researchers find better ways to ferry this information around, it’s necessary to reliably measure radiation power through these fibers. In order to calibrate a radiation power meter, researchers currently have to use a bulky cryogenic system and transfer the measurements to at least one other intermediate system. Each of these transfers increases uncertainties in the measurements, and the cryogenic systems are relatively rare and expensive to use and maintain.

Posted in: Briefs, Sensors

Space Radiation Detector with Spherical Geometry

This technology enables in-situ studies of the impact of Galactic Cosmic Radiation ions on Earth and in space.

NASA’s Glenn Research Center has developed and patented the Compact Full-Field Ion Detector System (CFIDS), a radiation particle detection system that provides information on the kinetic energies, directions, and electric charges of subatomic particles. The integrated package consists of a spherical Cherenkov detector, a compact detector stack, and low-noise, large-area detectors based on silicon carbide. The detectors and configuration can be modified to suit specific applications. The technology is an improvement over more conventional gas ionization detectors because the higher density of the solid media provides higher sensitivity to radiation. Originally developed to measure the properties of cosmic rays in outer space, the technology could be adapted for use on Earth for radiation dosimetry aboard high-altitude aircraft and in proton radiation therapy for cancer treatment.

Posted in: Briefs, Sensors

Active Remote Sensing Radiometer

This technology can be used for security screening and security imaging, as well as automotive navigation in dust and fog conditions where machine vision performs poorly.

Posted in: Briefs, Sensors, Imaging and visualization, Radar, Remote sensing, Thermodynamics

AutoSurvey™ Software System

The U.S. Navy has developed a software system that optimizes the collection of data for hydrographic surveys. The autonomous survey system, called AutoSurvery, is an easy-to-implement, real-time adaptive software system for the collection of swath-type data that minimizes survey time while maintaining data quality and ensuring the desired coverage.

Posted in: Briefs, Sensors, Computer software and hardware, Data acquisition and handling, Sensors and actuators, Defense industry, Marine vehicles and equipment

Authenticated Sensor Interface Device

Researchers at the Savannah River National Laboratory (SRNL) have developed a device to read data, encrypt the information, and distribute it electronically to multiple locations, providing a one-way data pathway that segregates each destination to prevent cross-party data manipulation. Previous “data diode” devices employ computer-based communication channels such as fiber-connected data cards between the sender and receiver. No integrated data authentication is performed, and data is sensitive to external attack and manipulation.

Posted in: Briefs, Sensors, Cyber security, Data acquisition and handling, Data exchange, Sensors and actuators

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, Chemicals, Vibration, Hazardous materials, Test equipment and instrumentation

Ultra-High-Speed Fiber Optic Sensor Detects Structural Damage in Real Time

A research group including members from Tokyo Institute of Technology (Tokyo Tech) and Japan Society for the Promotion of Science has developed a real-time, fiber-optic, distributed sensing system for strain and temperature. The system requires light injection from only one end of the fiber, and can achieve a sampling rate of 100 kHz, an improvement of more than 5,000 times the conventional rate.

Posted in: Briefs, Sensors, Body structures, Fiber optics, Sensors and actuators, Diagnostics

Piezoelectric Field Disturbance Sensing System and Method

This technology provides a lightweight, cost-effective solution for structural measurements.

The invention developed is a piezoelectric stimulus-response quantification-based gravimeter (PEG). The PEG takes a completely innovative approach towards utilization of the piezoelectric element — quantifying the gravitational effects on them. In this way, the piezoelectric element can: (1) generate an electric charge in response to mechanical deformation, and (2) be mechanically deformed by applying electric charges. This is known as the converse-piezoelectric effect. Piezoelectric elements can be used to precisely inject energy for exciting vibratory frequencies within the element and housing, enabling the element to be used for quantifying subsequently produced electrical output. The gravimeter is capable of measuring numerous other types of physical quantities such as thermal, magnetic, electrical, electromotive, electromagnetic,and electro-static fields, and provide static and structural information.

Posted in: Briefs, Sensors, Measurements, Vibration, Test equipment and instrumentation

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