Low-frequency in-plane vibration monitoring/measurement using circular grating Talbot interferometer

An application of circular grating Talbot interferometer for measurement of low-frequency vibrations in a plate is demonstrated. Experiments were conducted to measure/monitor the in-plane low-frequency vibration from 1 to 25 Hz in a plate object. The measurement system is advantageous over accelerometer, because it is easy to construct, less expensive, and robust. This method can be implemented conveniently to quantitatively measure temporal and continual displacements of the vibration object with variable sensitivity and also applicable to shallow curved objects.