Engineering topics

Thompson, Zachary J

Publications and source records attributed to Thompson, Zachary J.

4 records

DOE OSTI2019

Digital Radiography and Computed Tomography (DRCT) of Recovered Chemical Warfare Materiel

The Digital Radiography and Computed Tomography (DRCT) of recovered chemical warfare material (RCWM) project is an ongoing effort to provide the following to the U.S. Army Chemical Materiel Activity (CMA): 1. Development of field-portable and transportable digital x-ray inspection capabilities including radiography and computed tomography. 2. Continuous maintenance and product development to maintain state of the art in x-ray inspection. 3. Evaluation and incorporation of advanced technologies. 4. Deployment of capabilities to selected U.S. Army designated sites. 5. Training of personnel in the use of x-ray inspection equipment. 6. Development of user guides and related documentation for inspection systems. 7. Operations support to field personnel to assess and resolve problems in the field. Support includes both remote (from Idaho) and on-site depending on the problem. These systems have been used to inspect thousands of containers ranging from bare and overpacked munitions to drums and ton containers. This in-progress program review showcases prospective efforts and updates to project systems that are in the developmental stage.

36 MATERIALS SCIENCE↗

DOE OSTI2019

Materials Characterization and Interrogation using Terahertz Radiation

Terahertz (THz) radiation is a powerful tool for characterizing materials and interrogating complex systems. The low-energy, non-ionizing nature of THz photons make it ideal for use as a non-destructive, non-contacting probe. Identification of materials by their unique THz response is possible through various absorption mechanisms, including vibrational (phonon) and rotational spectra. The Drude-like response of materials allows for non-contact electrical conductivity measurements as well. In the additive and advanced manufacturing realm, high sampling rates (kHz) and ability to extract electrical conductivity and composition makes in-situ THz imaging and spectroscopy a prime candidate for monitoring melt-pool dynamics in metal 3D printers. The fiberization of pulsed lasers systems enables the use of THz radiation to monitor oxide layer growth and characterize microstructure in challenging environments, whether ex-situ (e.g. post irradiation hot-cells) or in-situ (e.g. Transient Test Reactor, TREAT), through time of flight measurements and unique vibrational spectra of materials, providing crucial data on previously out of reach processes. While security imaging using THz radiation is already employed in airport body scanners, further miniaturization and ruggedization of THz systems enables materials characterization during field operations, adding a necessary and complementary tool to the arsenal of spectroscopic technologies available to the military and first responders. Cybersecurity is also a major focus for the coming decades; the use of THz interrogation methods to monitor integrated circuit operations provides a non-contacting, undetectable probe for system verification.

36 MATERIALS SCIENCE↗

DOE OSTI2019

Non-Destructive Terahertz Imaging and Spectroscopy

Terahertz (THz) science is a rapidly expanding field. Imaging and spectroscopy in this frequency region has only recently been realized. This presentation will cover applications of plasmonic induced transparency antenna arrays, the transiently excited insulator to metal phase transition in vanadium dioxide, interrogation of integrated circuits using terahertz radiation, and possible future applications of THz radiation.

36 MATERIALS SCIENCE↗

DOE OSTI2019

Terahertz (THz) Future Application Slides

The attached slides represent future applications for terahertz (THz) technology. These slides are to be used in a presentation at MFC on Thursday, 21 Feb, 2019.

36 MATERIALS SCIENCE↗