MAGNETIC DENSITOMETER

Patent · Tue Aug 15 04:00:00 EDT 1961

OSTI ID:4022436

McCann, J A; Jones, R H

A magnetic densitometer for locating defects and metallic inclusions in materials is described. The apparatus consists of two primary coils connected in series opposition and adapted te be placed in inductive relation to the material under test, a source of constant frequency alternating current coupled across the primary coil combination, a pick-up coil disposed in symmetrical inductive relationship with said primary coils, a phase-shifter coupled to the output of the energizing source. The output of the phase-shifter is coupled in series with the pick-up coil. An amplifier is provided selective to the third harmonic of the energizing source frequency. The series combination of the pick-up coil and the phase-shifter output are connected across the input of the amplifier, and an amplitude comparitor is coupled to the output of the amplifier and the energizing source for comparing the instantaneous amplitude of the amplifier output and the instantaneous output of the energizing source and producing an output proportional to the difference in amplitude. A recorder is coupled to the output of the amplitude comparison means to give an indication of the amplitude difference, thereby providing a permanent presentation of the character of the changes in characteristics exhibited by the material under test. (AEC)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-025017
• Assignee: U.S. Atomic Energy Commission
• Patent Number(s): US 2996662
• OSTI ID: 4022436
• Country of Publication: United States
• Language: English

Related Subjects

AMPLIFIERS
BATTERIES
DENSITY
ENGINEERING AND EQUIPMENT
IMPURITIES
INSTRUMENTS
MAGNETIC FIELDS
MATERIALS TESTING
METALS
POWER PLANTS
POWER SUPPLIES
RECORDING SYSTEMS