USA As Represented by Secretary of the Navy

Douglas M Photiadis

Brian H Houston

Joseph A Bucaro

Maxim K Zalalutdinov

Jeffrey W Baldwin

Bernard R Matis

Joseph F Vignola

Nicholas T Gangemi

Steven W Liskey

Aaron D Edmunds

William B Wilson

Angie Sarkissian

An article having: an elastomeric jacket; a gel within the jacket; and a plurality of gas-filled, polymerically-encapsulated microbubbles suspended in the gel. The microbubbles have a Gaussian particle size distribution. The largest microbubble has a diameter at least 10 times the diameter of the smallest microbubble. The article may exhibit Anderson localization at at least one frequency of sound waves impacting the article.

Soft matter having an Anderson transition to a localized phase

Systems and methods are provided for sensing acoustic signals using a floating base vector sensor. A vector sensor according to an embodiment of the present disclosure can be used to detect and characterize low frequency sound wave(s) in a viscous medium (e.g., air, water, etc.) by detecting a periodic motion of the media particles associated with the sound wave(s). The orientation of the particle velocity deduced from such measurements can provide information regarding the wave vector of the sound wave(s), can define the direction of arrival (DOA) for the acoustic signal, and can assist locating the source of the sound of interest.

Floating base vector sensor

A mechanical oscillator is provided for use in micro-electromechanical systems (MEMS) for application in radio frequency filters and oscillators, motion and pressure sensors and other micro applications. The oscillator is of monolithic construction and has a high Q with little energy loss because of teeth attached to the oscillating member which contain energy and prevent losses.

Monolithic vibration isolation and an ultra-high Q mechanical resonator

An apparatus for measuring the amount of motion of the surface of a microscopic object includes a light source, an optical fiber for transmitting the light, and a collection objective. The optical fiber emits the light output through an aperture tapered to a diameter in the range of from 20 nm to 200 nm. The collection objective is positioned to receive both the direct component of the fiber light output and the Doppler-shifted reflected light of the fiber light output from the surface of the object. The direct component and the Doppler-shifted reflected light combine in the collection objective to form an interfered light signal that is output to a photo-receiver. The intensity of the interfered light signal is modulated by the relative phase shift between the two interfering beams and is proportional to the out-of-plane displacement caused by the surface motion of the object surface. The photo-receiver receives the interfered light signal and converts it to an electrical signal that is proportional to the light intensity and representative of the amount of the surface motion of the object. A signal processor processes the electrical signal and outputs the amount of surface motion of the object's surface. A tip altitude control system positions the output end of the optical fiber relative to the surface of the sample. A movable stage receives and secures the object in order to enable measurements to be taken at a plurality of locations on the surface of the object. In addition to measuring surface motion and detecting small mass changes on an object's surface, the invention may be used to measure high frequency surface phonons.

Nanoscale vibrometric measurement apparatus and method

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Falls Church, VA, United States of America

Douglas M Photiadis