Enhancing the sensitivity to small phase changes in double-exposure stroboscopic television holography

摘要: We present a new technique for enhancing the sensitivity of double-exposure stroboscopic television holography (TVH) to detect and measure vibrations small amplitude. The is based in modulation phase reference beam synchronism with vibration measurand derives from former that we originally contrived evaluation. propose two variants, characterized by demodulation process used generate secondary correlograms, different behaviors terms sign ease detecting presence shape vibration. have implemented this an electronic speckle-pattern interferometer compared its performance standard TVH techniques; amplitudes as 8 nm been observed setup.