The theoretical and experimental analysis of SNR in frequency-translated holography that is applied to the detection of small vibration amplitude is presented in this paper. The feature of the experiments lies on the usage of acoustic surface waves as the vibrating test object, since the acoustic surface waves give the reliable vibration amplitude and the easiness of the measurement of SNR. Furthermore the detectable smallest amplitude is estimated as 2.7 × 10-4 λ, which is several tenths smaller than the previously presented estimations, and the dependences of the detectable smallest vibration amplitude on the experimental arrangements are also made clear.
Mitsuhiro Ueda, Sumio Miida, and Takuso Sato, "Signal-to-noise ratio and smallest detectable vibration amplitude in frequency-translated holography: an analysis," Appl. Opt. 15, 2690-2694 (1976)