Automated measurement system employing eddy currents to adjust probe position and determine metal hardness

Prince, James M; Dodson, Michael G; Lechelt, Wayne M

Title: Automated measurement system employing eddy currents to adjust probe position and determine metal hardness

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Abstract

A system for measuring the hardness of cartridge cases employs an eddy current probe for inducing and sensing eddy currents in each cartridge case. A first component of the sensed signal is utilized in a closed loop system for accurately positioning the probe relative to the cartridge case both in the lift off direction and in the tangential direction, and a second component of the sensed signal is employed as a measure of the hardness. The positioning and measurement are carried out under closed loop microprocessor control facilitating hardness testing on a production line basis.

Inventors:

Prince, James M ^[1]; Dodson, Michael G ^[2]; Lechelt, Wayne M ^[3]

Kennewick, WA
Richland, WA
Benton City, WA

Issue Date:: 1989-01-01

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

OSTI Identifier:: 867048

Patent Number(s):: 4849693

Assignee:: Battelle Memorial Institute (Richland, WA)

Patent Classifications (CPCs):: G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N27/9053 - {Compensating for probe to workpiece spacing}

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DOE Contract Number:: AC06-76RL01830

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: automated; measurement; employing; eddy; currents; adjust; probe; position; determine; metal; hardness; measuring; cartridge; employs; current; inducing; sensing; component; sensed; signal; utilized; closed; loop; accurately; positioning; relative; lift; direction; tangential; employed; measure; carried; microprocessor; control; facilitating; testing; production; line; basis; closed loop; eddy current; eddy currents; current probe; accurately positioning; production line; microprocessor control; employing eddy; accurately position; /324/

Citation Formats


                    Prince, James M, Dodson, Michael G, and Lechelt, Wayne M. Automated measurement system employing eddy currents to adjust probe position and determine metal hardness.  United States: N. p., 1989. 
        Web.

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                    Prince, James M, Dodson, Michael G, & Lechelt, Wayne M. Automated measurement system employing eddy currents to adjust probe position and determine metal hardness.  United States.

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                    Prince, James M, Dodson, Michael G, and Lechelt, Wayne M. Sun .  
        "Automated measurement system employing eddy currents to adjust probe position and determine metal hardness".  United States.  https://www.osti.gov/servlets/purl/867048.

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@article{osti_867048,

  title        = {Automated measurement system employing eddy currents to adjust probe position and determine metal hardness},

  author       = {Prince, James M and Dodson, Michael G and Lechelt, Wayne M},

  abstractNote = {A system for measuring the hardness of cartridge cases employs an eddy current probe for inducing and sensing eddy currents in each cartridge case. A first component of the sensed signal is utilized in a closed loop system for accurately positioning the probe relative to the cartridge case both in the lift off direction and in the tangential direction, and a second component of the sensed signal is employed as a measure of the hardness. The positioning and measurement are carried out under closed loop microprocessor control facilitating hardness testing on a production line basis.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1989},

  month        = {1}

}

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