Acoustic interferometer

About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.

Acoustic Waves in Bulk Blasts in Opencasts

Abstract: This paper reports results from experimental studies of acoustic waves with amplitudes of 1–100 Pa from bulk blasts in opencasts. The wave shape, amplitude, duration, and pulse, and their dependences on the mass of the explosive at epicentral distances of 1–10 km are obtained. It is shown that the vibration amplitudes excited by acoustic waves acting on the frontage of multi‐storey buildings are several times larger than those produced by seismic waves.

The Nature of Sound

Abstract: This chapter summarizes the physical properties of sound waves that will be relevant in the later chapters. A simple elastic gas model can explain how the propagation speed of sound depends only on the bulk modulus and density of the air. We then introduce the homogeneous linear wave equation, from which the superposition of harmonic solutions (standing waves and traveling waves), and the concept of Fourier series are derived. As an example, we discuss the fundamental problem of spectral–temporal resolution. We then describe how inhomogeneities in the medium may change the wave equation and lead to nonharmonic spatial waves. We introduce the concept of acoustic impedance, and how this defines the conditions for transmission and reflection at boundaries between different media. We illustrate these ideas for the middle-ear transfer of acoustic energy from air to the fluid-filled cochlea. Finally, we discuss how the dispersion relation for homogeneous and inhomogeneous media relates to the phase and group velocities of the acoustic signals.

Experimental investigation of the acoustooptic interaction in a waveguide interferometer

Abstract: An experimental investigation was made of the transfer characteristics and signal readout efficiency of devices utilizing surface acoustic waves. The investigation was carried out using a strip optical waveguide interferometer. A prototype of this interferometer was made from a YZ-cut lithium niobate substrate. Electrodes were used for electrooptic correction of ihe initial phase shift between the optical waves in the interferometer arms and an opposed-comb transducer was employed to excite acoustic waves. The results should be useful in the development of signal

One-dimensional model for laser generated elastic waves in a solid layer : the illuminated surface of which is constrained by a transparent liquid medium

Abstract: TABLE OF CONTENTS-Continued vi Page 4. DISPLACEMENT S O L U T IO N ........................................................................26 Displacement S o lu tion .................................................................... .... . . . 26 5. OBSERVATIONS AND R E SU L T S................................................................... 43 Waveform Generated at the Back Surface of the S o l id ................................43 Physical Interpretation .................................................................... 48 6. C O N C L U S IO N ........................ 57 REFERENCES C I T E D ....................................................... 59 A P P E N D IC E S ........................ 62 Appendix A: Program to calculate the temperature distribution in the solid medium ............................................................................................63 Appendix B: Program to calculate the waveform generated at the back surface of the solid m e d iu m ................................................................. 6 8