This tool calculates the Specific Absorption Rate (SAR) and Incident Power Density for a given electric field, conductivity, and material density. It helps estimate how much electromagnetic energy is absorbed by a material, particularly in human tissue exposure assessments.
Formulas
SAR = (σ * E²) / md
Incident Power Density = E² / 377
Formula Explanation
- σ = Conductivity of the material (S/m)
- E = Electric field strength (V/m)
- md = Mass density (kg/m³)
- 377 Ω represents the impedance of free space
Example
Input: σ = 1.5 S/m, E = 50 V/m, md = 1000 kg/m³
Result: SAR = 0.00375 W/kg, Power Density = 6.63 W/m²
Who uses it
Essential for RF engineers and safety analysts evaluating electromagnetic exposure levels in wireless communication and biomedical applications.