Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1977-09-09
1979-01-09
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324241, 307228, 328185, G01R 3312, H03K 408
Patent
active
041340671
ABSTRACT:
A readily portable battery operated eddy current device is disclosed for detecting fissures, cracks or other defects in metal surfaces such as the walls of rivet holes in aircraft parts. Dual sensing transformer secondaries having a high-frequency energized common primary are embedded with pole faces peripherally exposed in a rotary detection probe insertable in a test hole. Differentially connected in a response circuit, these secondaries, constructed with slight mismatch between them, yield a composite response to the presence of a hole wall defect that when differentiated provides a uniquely definitive monopolar pulse of magnitude and relative phase position uniquely indicating on an oscilloscope screen the nature and the precise location of the defect. A stationary induction coil and a permanent magnet on the rotating probe produce cyclic pulses utilized to produce a cathode ray tube sweep that is both synchronized with probe rotation and that is maintained at substantially constant sweep magnitude despite variations in probe rotation speed and, for that matter, system operating voltage supplied by the battery.
REFERENCES:
patent: 2604515 (1952-07-01), McNulty
patent: 2924707 (1960-02-01), Chandler
patent: 2970256 (1961-01-01), Sazynski et al.
patent: 3617869 (1971-11-01), Germann et al.
patent: 3718855 (1973-02-01), Rogel et al.
Corcoran Robert J.
The Boeing Company
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