Method and apparatus for identifying conductive objects by monitoring the true resistive component of impedance change in a coil system caused by the object
Patent
·
OSTI ID:863867
- Vienna, VA
- McLean, VA
- Falls Church, VA
- Arlington, VA
The type of conductor, its property, and if a metal, its type and cross-sectional area can be obtained from measurements made at different frequencies for the amount of unbalance created in a previously balanced stable coil detection system. The true resistive component is accurately measured and thus reflects only the voltage loss attributable to eddy currents caused by introduction of the test sample to the coil system. This voltage divided by corresponding applied frequency gives a curve which peaks at a frequency dependent upon type of conductor. For a metal this peak frequency is proportional to the samples resistivity divided by its cross-sectional area.
- Research Organization:
- Georgetown Univ., Washington, D.C. (USA)
- Assignee:
- Georgetown University (Washington, DC)
- Patent Number(s):
- US 4263551
- OSTI ID:
- 863867
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/324/
accurately
accurately measure
accurately measured
amount
apparatus
applied
attributable
balanced
caused
change
coil
component
conductive
conductor
corresponding
created
cross-sectional
currents
curve
dependent
detection
divided
eddy
eddy current
eddy currents
frequencies
frequency
identifying
impedance
impedance change
introduction
loss
measured
measurements
metal
method
monitoring
obtained
peak
peaks
previously
property
proportional
reflects
resistive
resistive component
resistivity
sample
samples
stable
true
type
unbalance
voltage
accurately
accurately measure
accurately measured
amount
apparatus
applied
attributable
balanced
caused
change
coil
component
conductive
conductor
corresponding
created
cross-sectional
currents
curve
dependent
detection
divided
eddy
eddy current
eddy currents
frequencies
frequency
identifying
impedance
impedance change
introduction
loss
measured
measurements
metal
method
monitoring
obtained
peak
peaks
previously
property
proportional
reflects
resistive
resistive component
resistivity
sample
samples
stable
true
type
unbalance
voltage