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

Patent · Tue Jul 18 00:00:00 EDT 1989

OSTI ID:7266869

Prince, J M; Dodson, M G; Lechelt, W M

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. 14 figs.

• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Inst., Richland, WA (United States)
• Patent Number(s): US 4849693; A
• Application Number: PPN: US 7-162020
• OSTI ID: 7266869
• Resource Relation: Patent File Date: 29 Feb 1988
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CONTAINERS
EDDY CURRENT TESTING
HARDNESS
PROBES
POSITIONING
AMMUNITION
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
ELECTROMAGNETIC TESTING
MATERIALS TESTING
MECHANICAL PROPERTIES
NONDESTRUCTIVE TESTING
ON-LINE CONTROL SYSTEMS
ON-LINE SYSTEMS
TESTING
420500* - Engineering- Materials Testing