Akobuije Chijioke

Publications

CHARACTERIZATION OF LASER DOPPLER VIBROMETERS USING ACOUSTO-OPTIC MODULATORS

December 31, 2020

Author(s)

Michael Gaitan, Jon C. Geist, Benjamin J. Reschovsky, Akobuije Chijioke

We report on a new approach to characterize the performance of a laser Doppler vibrometer (LDV). The method uses two acousto-optic modulators (AOMs) to

Error Quantification in Dynamic Applications of Weakly Nonlinear Transducers

November 3, 2020

Author(s)

Lautaro D. Cilenti, Akobuije Chijioke, Balakumar Balachandran

Characterization and quantification of dynamic measurements is an ongoing area of research in the metrological community as new calibration methods are being

Design Considerations to Improve Charpy Instrumented Strikers

March 16, 2020

Author(s)

Nicholas Vlajic, Akobuije Chijioke, Enrico Lucon

Instrumented impact testing allows the applicability of conventional Charpy tests to be extended toward assessing mechanical properties such as dynamic fracture

Investigations on SI-Traceable Dynamic Calibration of Instrumented Charpy Strikers - Activities performed at NIST in FY2019

January 3, 2020

Author(s)

Nicholas Vlajic, Akobuije Chijioke, Enrico Lucon, Lance Einfeld

In recent years, investigations have been conducted at NIST (as a collaboration between the Fatigue and Fracture Group in Boulder, CO and the Force and Mass

Generalized source-conditions and uncertainty bounds for deconvolution problems

October 1, 2018

Author(s)

Jake D. Rezac, Andrew M. Dienstfrey, Nicholas A. Vlajic, Akobuije D. Chijioke, Paul D. Hale

Many problems in time-dependent metrology can be phrased mathematically as deconvolution problems. In such cases, measured data is modeled as the convolution of

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Patents (2018-Present)

CALIBRATION APPARATUS AND CALIBRATING A LASER DOPPLER VIBROMETER

NIST Inventors

Michael Gaitan , Benjamin Reschovsky and Akobuije Chijioke

patent description Our results show that this approach is immediately useful as a tool for characterizing the bandwidth of an LDV as a system together with its acquisition and control electronics and amplifiers. Our future work is focused on further improvements on the system design and carrying out

Dynamic Force Contactor, Providing a Dynamic Force, and Calibrating a Force Sensor to be Traceable to the International System of Units

NIST Inventors

Akobuije Chijioke

Patent Description A longstanding and thorny problem in force metrology is that of accurately measuring rapidly changing forces. A key part of the problem is that the dynamic response of force sensors changes depending on the system in which the sensor is used, meaning that an external calibration

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Akobuije Chijioke (Fed)

Publications

Patents (2018-Present)