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Accession Number
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ADA566269
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Title
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Probe Array Correction With Strong Target Interactions.
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Publication Date
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Aug 2012
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Media Count
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47p
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Personal Author
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J. Schindler
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Abstract
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We analyze technical problems associated with using an array of probes to measure simultaneously the near fields scattered by a target to decrease collection times. Array-target coupling distorts the fields to be measured. Element mutual coupling modifies measurements. To minimize coupling, active loading at array elements with strong target interaction is analyzed numerically. Loading minimizes perturbations in the target currents. There is little advantage to using in-situ mutual impedances to determine loads. We provide a probe array compensation theory based on the Lorentz reciprocity theorem giving the open circuit probe array voltages. Voltage corrections are developed from array calibration and measurements of the incident plane wave. Numerical study shows that (a) corrections to the measured voltages due to the presence of the array are small and (b) corrections due to the other elements of the array can be important but corrected with calibration. Errors introduced by the use of realizable calibration sources and loads and experimental errors are estimated. Results of this study suggest a hybrid measurement process.
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Keywords
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Arrays
Bistatic scattering
Calibration
Collection
Corrections
Coupling(Interaction)
Currents
Electromagnetic near field measurements
Errors
Hybrid systems
Interactions
Lorentz reciprocity
Measurement
Near field
Numerical analysis
Perturbations
Plane waves
Probes
Scattering
Sources
Targets
Theorems
Voltage
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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49 - Electrotechnology
94K - Laboratory & Test Facility Design & Operation
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Corporate Author
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Air Force Research Lab., Wright-Patterson AFB, OH. Sensors Directorate.
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Document Type
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Technical report
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Title Note
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Interim rept. 1 May 2011-31 May 2012.
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NTIS Issue Number
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1306
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Contract Number
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N/A
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