Phasor adder
A
B
A+B
amp A
1.00
phase A
0.00
amp B
1.00
phase B
1.57
Detected intensity I =
0.00
I = A^2 + B^2 + 2 A B cos(phiB - phiA)
=
Equal phasors in phase give (A+B)^2 (maximum); opposite phases give (A-B)^2 (minimum).