Simultaneous Specific Absorption Rate Ratio Summation and Peak Location Separation
Exceeding simple SAR summation thresholds requires peak location separation ratios below 0.04 to avoid multi-thousand-dollar volumetric chamber testing.
Cartesian Coordinates
Meaning
Position tracking references define the spatial grid inside automated radiofrequency probe scanning systems during phantom exposure testing. Measurement systems rely on cartesian coordinates to position E-field probes along defined X, Y and Z axes within fluid-filled phantom shells. Axis alignment allows software to map localized absorption patterns with sub-millimeter precision.
Spatial resolution determines the accuracy of peak absorption modeling.
Spatial Grid
Three orthogonal axes establish a precise mechanical reference frame relative to the phantom shell boundary. System calibration maps mechanical zero points to match phantom geometric baselines. Automated positioners navigate along cartesian coordinates during coarse area scans and fine volume scans.
Probe Trajectory
Stepper motors translate probe tips through liquid media using deterministic spatial steps. Area scans locate general absorption hot spots across two-dimensional planes. Subsequent volume scans move probes along three-dimensional cartesian coordinates to capture spatial energy gradients surrounding peak absorption points.
Extrapolation algorithms calculate field strengths near phantom boundaries where mechanical probes cannot physically reach. Precision optical encoders verify probe position accuracy along each axis during scan routines.
System Calibration
Mechanical drift or axis misalignment introduces spatial errors into power density calculations. Periodic robot re-calibration verifies movement accuracy against certified reference gauges. Precise cartesian coordinates ensure repeatable spatial measurements across different test laboratories.