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Title: Metal Resistivity Measuring Device

Abstract

An eddy current device is designed for detecting discontinuities in metal samples. Alternate short and long duration pulses are inductively applied to a metal sample via the outer coil of a probe. The lorg pulses give a resultant signal from the metal sample responsive to probe-tosample spacing and discontinuities with the sample, and the short pulses give a resultant signal responsive only to probe-to-sample spacing. The inner coil of the probe detects the two resultant signals and transmits them to a separation network where the two signals are separated. The two separated signals are then transmitted to a compensation network where the detected signals due to the short pulses are used to compensate for variations due to probeto-sample spacing contained in the detected signals from the long pulses. Thus a resultant signal is obtained responsive to discontinuities within the sample and independent of probe-to- sample spacing.

Inventors:
;
Issue Date:
OSTI Identifier:
4099505
Patent Number(s):
2965840
Assignee:
U.S. Atomic Energy Commission
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
NSA Number:
NSA-15-009162
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-61
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING AND EQUIPMENT; CIRCUITS; COILS; EDDY CURRENTS; ELECTRIC CONDUCTIVITY; MATERIALS TESTING; METALS; PULSES; SIGNALS; DETECTION; MEASURED VALUES; SAMPLING

Citation Formats

Renken, Jr, C. J., and Myers, R. G. Metal Resistivity Measuring Device. United States: N. p., 1960. Web.
Renken, Jr, C. J., & Myers, R. G. Metal Resistivity Measuring Device. United States.
Renken, Jr, C. J., and Myers, R. G. Tue . "Metal Resistivity Measuring Device". United States. https://www.osti.gov/servlets/purl/4099505.
@article{osti_4099505,
title = {Metal Resistivity Measuring Device},
author = {Renken, Jr, C. J. and Myers, R. G.},
abstractNote = {An eddy current device is designed for detecting discontinuities in metal samples. Alternate short and long duration pulses are inductively applied to a metal sample via the outer coil of a probe. The lorg pulses give a resultant signal from the metal sample responsive to probe-tosample spacing and discontinuities with the sample, and the short pulses give a resultant signal responsive only to probe-to-sample spacing. The inner coil of the probe detects the two resultant signals and transmits them to a separation network where the two signals are separated. The two separated signals are then transmitted to a compensation network where the detected signals due to the short pulses are used to compensate for variations due to probeto-sample spacing contained in the detected signals from the long pulses. Thus a resultant signal is obtained responsive to discontinuities within the sample and independent of probe-to- sample spacing.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1960},
month = {12}
}