# Fresnel-zone clearance
# Scope: First Fresnel-zone radius at a supplied path point.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

wavelength = 0.125 m
distanceA = 50 m
distanceB = 50 m
clearance = 2 m

radius := sqrt(wavelength*distanceA*distanceB/(distanceA+distanceB)) [m]
required := 0.6*radius [m]

check Fresnel clearance example: clearance >= required

scenario alternative: wavelength = 0.1 m