Meaning
Numerical algorithms adjust for electromagnetic field distortion caused by the physical proximity of a probe sensor to a phantom boundary. When an electric field sensor approaches a dielectric interface, the secondary reflection from the boundary alters the local field distribution, requiring boundary effect compensation to maintain measurement linearity. This corrective mechanism relies on the known physical offsets of the dipole sensors from the tip of the probe to compute the true field strength.
Standard procedures dictate that this process must be applied during automated specific absorption rate scans.
Mathematical Correction
Formulations for these corrections use the ratio of the measured field at multiple distances from the boundary to determine the decay rate. This boundary effect compensation uses a dual-point or multi-point extrapolation technique. The algorithm calculates the exponential decay of the field as a function of depth to subtract the reflection factor.
Probe calibration certificates specify the valid distance range for these corrections.
Calibration Verification
Testing laboratories evaluate these compensation routines using reference liquids and flat phantoms to verify measurement consistency. During a system verification run, the boundary effect compensation must keep the deviation under the limits set by standard committees. If the probe moves closer than the minimum mechanical distance, the correction error increases, making it necessary to limit the scan height.
Technical standards establish the threshold where the mathematical correction becomes invalid.
Measurement Margin
Safety assessments require highly stable readings to prevent false compliance reporting. Because boundary effect compensation reduces the uncertainty budget of the system, it directly influences the reproducibility of localized power density tests.
