An irradiance-floor scan lowers irradiance across three rows toward a detection floor, showing how the pressure and force fall with it row by row. The arithmetic is exact only for the stated irradiances, areas, and rows in the ideal uniform-beam model. Real measurements add beam profile, alignment, reflectivity/absorption, detector calibration, timing/area calibration, surface geometry, and uncertainty.
Source power is scanned below, at, and above an irradiance floor. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Irradiance is scanned against a useful floor
Beam area stays 6 square meters while source power is 12 W. The rendered quotient gives 2 watts per square meter which is below the 4 watts per square meter floor.
I=P/A=12/6=2W/m2
Irradiance is scanned against a useful floor
Beam area stays 6 square meters while source power is 24 W. The rendered quotient gives 4 watts per square meter which is at the 4 watts per square meter floor.
I=P/A=24/6=4W/m2
Irradiance is scanned against a useful floor
Beam area stays 6 square meters while source power is 36 W. The rendered quotient gives 6 watts per square meter which is above the 4 watts per square meter floor.