Acoustic interferometer

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

Acoustic Amplification Device

Abstract: An amplification device amplifies sound waves that emit from a portable electronic device. The portable electronic device joins the amplification device at a horizontal orientation that is efficacious for watching videos in wide screen format. A slot in the amplifying device engages a speaker in the portable electronic device. The amplifying device receives sound waves generated by the speaker at a narrow, speaker receiving end, passes the sound waves through an acoustic channel, and finally emits the sound waves from a wide, amplifying end. Increasing surface area at the wide end of the amplifying device lowers the acoustic impedance, and consequently amplifies the sound waves. The sound waves amplify because acoustic impedance is lowered and matched to the proximate air. A cone-shaped dispersion port positions within the acoustic channel to optimize sound wave dispersion. A housing contains the components and has a sloped surface for supporting chargers.

A Field Compensated Interferometer for Wavelength Comparison

Abstract: We have built at the Institut National de Metrologie (INM) a two beam interferometer, of Michelson type, for optical wave-length comparison. It is in vacuum and the separating plate works at Brewster’s angle. Its main quality is to give a flat field of interference at a path difference chosen for measurements (temporarily 250 mm), hence providing a large flux. The standard line of krypton provides a signal-to-noise ratio which allows us to work with a continuous scanning of path difference and a time constant less than 10−1 second.

Dynamics of Picosecond Laser-Generated Acoustic Waves in Solids

Abstract: Generation and propagation characteristics of picosecond laser-generated acoustic waves in solids were studied using an optical detection technique and a ZnO piezoelectric transducer. The propagation of laser-generated acoustic waves was directional. At the early stage of propagation, the propagation velocity of the wavefront exceeded the sound velocity in solids. The generation and propagation behavior of acoustic waves are very sensitive to the interaction conditions between laser pulses and solid surfaces. The formation and expansion of laser-generated plasmas affect the generation dynamics of acoustic waves.