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Features of amplitude modulated detection. a. Weak signals below the sensor’s noise floor (SNR ~ 0.25) in the raw data Vd can be readily resolved in Ψ after being correlated with the correct mask (b). c. Multiple droplets in the detection region concurrently, which are not resolvable in the raw data Vd, can be separated and resolved in Ψ after being correlated with the correct mask (d).
