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

Patent · Sun Jan 01 00:00:00 EST 1989

OSTI ID:867048

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

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1. Kennewick, WA
2. Richland, WA
3. Benton City, WA

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.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 4849693
• OSTI ID: 867048
• Country of Publication: United States
• Language: English

Related Subjects

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
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