Bbnt Solutions Llc.

Raytheon Bbn Technologies Corp.

Velcro Industries B.v.

Oil States Industries Limited

Bolt Beranek and Newman Inc.

Gte Internetworking Incorporated

Richard Madden

Daniel Joseph McCarthy

Gary L Thomas

James Edwin Barger

Bruce Stuart Murray

Jonathan Edmund Ludlow

Paul James Remington

Ronald Bruce Coleman

Martin E Smirlock

George Woods Shepard

David H Whittemore

John Scott Knight

Douglas S Hanna

Alan R Curtis

Methods and systems of parasitic sensing are shown and described. The method includes, measuring, at a first time using one or more electrical elements native to a domain, a parameter of a circuit within the domain and measuring, at a second time using the one or more electrical elements native to the domain, the parameter. The method also includes, comparing the parameter measurement from the first time to the parameter measurement at the second time and determining, in response to the comparison, that an activity occurred within the domain.

Methods and systems for parasitic sensing

A variable reluctance load cell for measuring the static or slowly fluctuating load, or tension, on devices is contained in a support tube. A sensor in the tube utilizes opposing C and I shaped magnetic cores attached to opposing ends of the support tube. A magnetic circuit is formed having an inductance defined by the size of the gap between the magnetic cores with the reluctance dominated by the gap. The sensor inductance is coupled with a fixed, predetermined capacitance in a resonant LC circuit, and the resonant frequency is a function of the gap. The sensor is in a cavity within the tube, and the cavity is sealed in a manner that prevents water or other damaging agents from entering the sensor. In this manner, mounting the sensor and tube to a static device and measuring the AC voltage at the sensor, the amount of load, or stress can be determined.

Load measurement device

A mechanical amplifier includes first and second amplifier mounting pads () and first and second sensor mounting pads (). At least one of the first and second amplifier mounting pads () receives a load or displacement. The first and second sensor mounting pads () connect to the first and second amplifier mounting pads () via flexible connecting members. A sensor () may connect to the first and second sensor mounting pads to measure the amount of load or displacement.

Mechanical amplifier systems and methods

A system ( ) monitors a load associated with a load carrying member. The system ( ) may include a voltage divider ( ) and a computer device ( ). The voltage divider ( ) measures inductance associated with load sensing elements ( ) that monitor the load carrying member. The computer device ( ) determines displacements of the load sensing elements ( ) based on the inductance associated with the load sensing elements ( ) and determines the load associated with the load carrying member based on the displacements of the load sensing elements ( ). The system may be designed to be portable and/or DC powered.

Load monitoring systems and methods

The present invention is noise attenuation system and related method for suppressing noise generated by a noise source, such as a jet engine, contained in a housing. An impedance device is positioned in the housing to attenuate the amplitude of sound waves generated by the noise source propagating in one direction and to create a reflected sound wave. The reflected sound wave is out of phase with the sound waves propagating from the noise source away from the impedance device. The reflected sound wave destructively interferes with this sound wave to attenuate the amplitude.

Sound attenuation system and related method

In the load cell disclosed herein, relative displacement between bridging members or end caps mounted at different points along the axis of an elastic hollow cylinder is sensed by means of a variable reluctance transducer employing a pair of magnetically permeable core elements. One of the core elements is mounted on one of the bridging members and the other core element is C-shaped and mounted on the other bridging member with the ends of the C-shape in close proximity to the first core member thereby providing magnetic gaps whose widths are aligned with the cylinder axis. Windings around the ends of the C-shaped core provide electrical connection for an inductance which is variable as a function of the widths of the gaps and thus also of the axial displacement between the bridging members.

Load cell

Silent touch fastener material adapted to releasably engage a mating surface and adapted to produce reduced sound during rapid separation of the touch fastener material from the mating surface. The material comprises a planar backing material having an engaging surface thereon contacting the backing material at discrete points and adapted to releasably engage the mating surface and means for reducing the coupling of noise-producing vibration from the backing material into the surrounding air. Various embodiments disclose the backing material as having a high mass relative to the mass of the engaging surface; a planar high mass supplemental backing material bonded to the backing material; a flexible, high mass material incorporated into the backing material; means disposed at the discrete points of attachment of the engaging surface to the backing material for suppressing the coupling of vibrations produced in the engaging surface into the backing material; and, the backing material comprising a lattice structure having low ability for transferring vibrations induced therein into the air surrounding it.

Growing community of inventors

Groton, MA, United States of America

Richard Madden