SPAD Single-Photon Detection
Dark Counts & SNR
Photon-counting signal-to-noise ratio from signal counts, dark counts and integration time.
SNR = S / √(S + D)
Fill the inputs from a real part
Every number is read from that part's datasheet entry: peak power and pulse energy as rated, pulse width at the part's rated maximum.
Solve for
Inputs
Result
Live diagram
Drawn from the values above, redrawn as you type - the same physical schematic the mini-program shows.