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7 results on '"Koffman, Andrew D."'

1. Eddy current rail inspection using AC bridge techniques

Author

Liu, Ze, Koffman, Andrew D., Waltrip, Bryan C., and Wang, Yicheng

Subjects
Railroads -- Electric properties, Electric measurements -- Methods, Electric currents -- Measurement, Chemistry, Physics, Science and technology
Abstract

AC bridge techniques commonly used for precision impedance measurements have been adapted to develop an eddy current sensor for rail defect detection. By using two detection coils instead of just [...]

Published
2013

2. Evaluation of a capacitance scaling system

Author

Avramov-Zamurovic, Svetlana, Koffman, Andrew D., Waltrip, Bryan Cristopher, and Yicheng Wang

Subjects
Calibration -- Analysis, Induction, Electromagnetic -- Research, Scaling laws (Statistical physics) -- Analysis
Published
2007

4. Improved 1-kHz capacitance calibration uncertainty

Author

Jeffery, Anne-Marie and Koffman, Andrew D.

Subjects
United States. National Institute of Standards and Technology -- Research, United States. National Institute of Standards and Technology -- Standards, Testing and measuring equipment industry -- Research, Testing and measuring equipment industry -- Conferences, meetings and seminars, Calibration -- Research
Published
2003

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