Keyword: Acoustics

Application Briefs: Imaging
Learn about a membrane-free, broadband microphone for the highest ultrasound frequencies.
Briefs: Electronics & Computers
High-frequency sound waves can be used to build new materials, make smart nanoparticles, and even deliver drugs to the lungs for painless, needle-free vaccinations.
Briefs: Test & Measurement
The system uses infrasonic acoustics for weather monitoring and for drone or UAV activity.
Briefs: RF & Microwave Electronics
This system enables battery-free ocean exploration with applications ranging from marine conservation to aquaculture.
Briefs: Test & Measurement
A smart fiber being tested on the International Space Station could be used to develop space dust telescopes and allow astronauts to feel through their pressurized suits.
Briefs: Imaging
Empa researchers were able to demonstrate real-time acoustic monitoring of laser weld seams.
Briefs: Test & Measurement
Interaction of sound and light reveals new information of a crystal's quantum properties.
5 Ws: Mechanical & Fluid Systems
The biometric tool uses modified wireless earbuds to authenticate smartphone users
Briefs: Automotive
This multifunctional hybrid laminate composite can be used for residential and commercial construction.
Briefs: Test & Measurement

In the wake of recent developments that have reduced fan and jet noise contributions to overall jet-engine noise, aircraft designers are turning their attention toward reducing engine core...

Briefs: Photonics/Optics

Researchers have constructed a “metamirror” device capable of perfectly reflecting sound waves in any direction. The proof-of-principle demonstration is analogous to looking...

Briefs: Communications

The traditional approach for wireless sensors involves interrogators that communicate with each other (i.e., the two boxes “talk” to each other). In contrast, surface acoustic wave...

Briefs: Sensors/Data Acquisition

NASA Langley Research Center scientists have developed a microphone that detects infrasound, i.e., acoustic waves ranging from 20-Hz frequencies down to DC. Infrasound is emitted in a number of...

Briefs: Aerospace

NASA Langley Research Center has developed a new approach for designing aircraft liner cores for noise reduction. The cores are comprised of multiple honeycomb-shaped chambers,...

Articles: Motion Control

This column presents technologies that have applications in commercial areas, possibly creating the products of tomorrow. To learn more about each technology, see the contact information provided for that...

Briefs: Data Acquisition
Device for Providing Real-Time Rotorcraft Noise Abatement Information

Rotorcraft typically operate near the ground throughout the duration of the operation. For this reason, military rotorcraft are vulnerable to acoustic detection, and public acceptance of civil rotorcraft is limited by annoyance caused by rotor noise radiation. The purpose of...

Briefs: Mechanical & Fluid Systems

Most naturally occurring materials have a disordered atomic structure that interferes with the propagation of both sound and electromagnetic waves. When the waves come into contact with these...

Briefs: Mechanical & Fluid Systems

NASA's Langley Research Center, in collaboration with Michigan State University (MSU), has developed a microphone array that...

Briefs: Materials

A thin material was developed that can control the redirection and reflection of sound waves with almost perfect efficiency. While many theoretical approaches to...

Briefs: Electronics & Computers

Researchers have observed waves of atomic rearrangements, known as phasons, propagating supersonically through a vibrating crystal lattice — a discovery that may dramatically...

Briefs: Electronics & Computers

NASA's Glenn Research Center has developed a novel Double-acting Extremely Light Thermo-Acoustic (DELTA) converter that operates at high frequencies (>400 Hz) with greatly...

Briefs: Photonics/Optics

When testing composite structures, it is important to understand the response of the structure to the load. Of significance is the formation of damage and growth of that damage leading...

Briefs: Aerospace

Researchers at NASA’s Glenn and Langley Research Centers have developed a groundbreaking bio-mimicking acoustic liner for quieting noisy environments. Conventional approaches have not been able to absorb...

Briefs: Test & Measurement
Noncontact Sensor Measures Density and Speed of Sound of a Liquid in a Pipeline or Vessel

The need for non-invasive, real-time measurement of the density and speed of sound of a liquid led to the development of an ultrasonic sensing technique based upon the reflection of ultrasound at the solid-fluid interface.

Briefs: Materials

Metamaterials with zero, or even negative refractive index for sound offer new possibilities for acoustic imaging and for the control of sound at sub-wavelength scales. The...

Briefs: Sensors/Data Acquisition

Time of flight is an approach that gauges distance by measuring the time it takes light projected into a scene to bounce back to a sensor. In time-of-flight imaging, a short burst of light is fired...

Briefs: Medical
Methods for Characterizing Nonlinear Fields of a High-Intensity Focused Ultrasound Source

Minimally invasive and non-invasive therapeutic ultrasound treatments can be used to ablate, necrotize, and/or otherwise damage tissue. High-intensity focused ultrasound (HIFU), for example, is used to thermally or mechanically damage tissue. HIFU thermal...

Briefs: Software
Sound Lab (SLAB) Version 5

Interest in the simulation of acoustic environments has prompted a number of technology development efforts over the years for applications such as auralization of concert halls and listening rooms, spatial information displays in aviation, virtual reality, and better sound effects for video games. Each of these...

Briefs: Test & Measurement

The Container Screening Device (CSD) is a portable, benchtop measurement system for real-time sealed-container inspection, and content (liquid/ material) classification and discrimination. The technology uses...