The work is devoted to an experimental study of the main parameters acoustic flow that occurs in a liquid under influence ultrasound source (US) with frequency 1.7 MHz. To type emerging currents, method tracer and fluorescence imaging was used; distribution relative pressure found using vibration sensor; measure intensity cavitation events, thermocouple measurements were used. Experiments have ...

The principles of operation and design immersion ultrasonic transducers developed by the authors for excitation reception elastic vibrations in moving filament-like plane-parallel materials, particular, polymer fibbers films, with an adjustable angle input (reception) probing signals into controlled object – films at normal high temperatures.
 technical characteristics installation are giv...

NASA exploration missions are increasingly including sampling tasks but with the growth in engineering experience (particularly, Phoenix Scout and MSL) it is now very much recognized that planetary drilling poses many challenges. The difficulties grow significantly with the hardness of sampled material, the depth of drilling and the harshness of the environmental conditions. To address the requ...

Developing technologies that would enable NASA to sample rock, soil, and ice by coring, drilling or abrading at a significant depth is of great importance for a large number of in-situ exploration missions as well as for earth applications. Proven techniques to sample Mars subsurface will be critical for future NASA astrobiology missions that will search for records of past and present life on ...

This study examined outstanding issues of sensitivity calibration methods for ultrasonic and acoustic emission transducers and provides workable solutions based on physically measureable quantities, laser-based displacement measurement in particular. This leads to mutually consistent determination of transmitting and receiving sensitivities of sensors and transducers. Methods of circumventing p...

When egg albumin in aqueous solution at the isoelectric point is subjected to the action of intense sound waves of audible frequency, a coagulum is produced (1). A previous investigation (2) indicated that such sound-denatured’ albumin is immunologically similar to denatured albumin prepared in other ways; e.g., by heat in acid, alkdme, or neutral solution, by alcohol, or by acid or alkali. Wu ...

For nocturnal insects, predation by bats can turn a moonlight flight into a nightmare. Moths have a way of avoiding bats, however, in the form of ultrasonic hearing. Because they have 'tympanal' ears, they can hear the echolocation calls of incoming bats and take evasive action. Butterflies, which are mainly diurnal, have not been known to have ultrasonic hearing. But these images from an unusu...

Actuators remain a limiting factor in robotics, especially in microrobotics where the power density of actuators is a problem. A 3 × 3 × 8.7 mm 3-axis piezoelectric ultrasonic micromotor system is described here in an effort to help solve this problem. Formed from 4 bulk lead zirconate titanate (PZT) thickness-polarized elements placed around the periphery of a rectangular rod, the stator is de...

Rodent ultrasonic vocalizations (USVs) are a vital tool for linking gene mutations to behavior in mouse models of communication disorders, such as autism [1]. However, we currently lack an understanding of how physiological and physical mechanisms combine to generate acoustic features of the vocalizations, and thus cannot meaningfully relate those features to experimental treatments. Here we te...

Abstract Ultrasonic welding of plastics has been used in a wide range industries and improving quality production speed are still important issues. This paper introduces method to evaluate the condition during welding. In this method, vibrations propagated were acquired using piezoelectric element. By fast fourier transform analysis, tracking calculation data, total harmonic distortion with tim...