Terahertz frequency (THz) radiation lies in between the microwave and infrared ranges.
While it is strongly absorbed by water, it is nonionizing and has low possibility of causing …

Imaging of sound aids the understanding of the acoustical phenomena such as propagation,
reflection, and diffraction, which is strongly required for various acoustical applications. The …

In this Letter, simultaneous imaging of flow and sound by using parallel phase-shifting
interferometry and a high-speed polarization camera is proposed. The proposed method …

This paper presents a method of significantly improving the previously proposed simple,
flexible, and accurate phase retrieval algorithm for the random phase-shifting interferometry …

High-speed train noise remains a wayside environmental issue. For accurate noise
prediction, the characteristics of a moving sound source must be revealed. In this work, the …

Phase extraction from single interferogram is of high significance and increasingly interest in
optical metrology. In this contribute we propose an advanced Pixel-level Lissajous Ellipse …

Sound fields radiated from the castanet, a Spanish percussive instrument comprising two
shells, were optically visualized. A measurement system, which used parallel phase-shifting …

The phase-shifting interferometry has been intensively studied for more than half a century,
and is still actively investigated and improved for more demanding precision measurement …

Aerodynamic sound is one of the causes of noise in high-speed trains, automobiles, and
wind turbines. To investigate the characteristics of aerodynamic sound generation …

Optical interferometric measurement methods for sound fields have garnered considerable
attention owing to their contactless nature. The capabilities of non-invasive measurement …