Southwest Research Institute

Other

Magnetus LLC

Stephen Anthony Cerwin

David B Chang

Jane F Emerson

James E Drummond

Thomas J Warnagiris

Kevin S Honeyager

Armando De Los Santos

Jerome A Helffrich

Robert E Martinez

Todd Hegert Goyen

Larry D Canady

Thomas C Untermeyer

Christopher B Catterson

Martin Gray Dennis

David Bing Jue Chang

Stuart McNaughton

Susan W Zogbi

A time-reversal mirroring electromagnetic acoustic treatment system is disclosed where electro-magnetic signals are directed to a region of interest in or on a patient. The EM signals induce an internally sourced acoustic signal due to variations in conductivity of the target tissue. Acoustic data representative of the induced acoustic signal are collected and analyzed to develop a model of a measured conductivity topology representing the conductivity topology of the target tissue. Measured parameters associated with the measured conductivity topology and derived from the acoustic data can be used to generate a time-reversed mirror acoustic treatment signal that can be used to apply a therapeutic treatment to a target tissue within the region of interest.

Time-reversed mirroring electro-magnetic acoustic treatment system

A microphone for use in windy environments. The microphone uses a transducer to flood the environment outside the microphone with a high frequency (such as an ultrasonic) acoustic field. The sounds desired to be detected are mixed with the high frequency carrier, and can then be received by the microphone with less wind noise. The microphone then demodulates the desired sound signals from the high frequency carrier. The microphone can be configured in a special emitter-receiver configuration that also reduces interference from engine noise.

Low noise microphone for use in windy environments and/or in the presence of engine noise

Methods and systems for using ground penetrating radar (GPR) to obtain subsurface images. The depression angle, frequency, and polarization can all be adjusted for the soil conditions at hand. In particular, the depression angle is set at the 'pseudo-Brewster angle' for improved ground penetration.

Signal processing methods for ground penetrating radar from elevated platforms

Methods for remotely detecting a gun muzzle flash, using frequency-optimized detection methods. Small explosive charges are best detected at I/R and visible wavelengths, using optical detectors, whereas large explosive charges may also be detected with antennas. Details of the time course and spectral properties of the flash can be used to distinguish gun muzzle flashes from other radiation.

Frequency-optimized detection of gun muzzle flashes

A sensitive photon detection system generates an electronic photon sensor signal as a K factor times a number N photons per unit time. The system is configured by combining a separate optical amplifier with a gain factor Kwith a photo detector with a gain factor Ksuch that K may be realized as the product of Kand K. The values of Kand Kare chosen to meet a predetermined K while optimizing a signal quality of the photon sensor signal. The optical amplifier may be preceded by a photon gathering device and/or a light chopping device to further optimize system performance. Further, the photon sensor signal may be further processed analog circuitry or may be digitized and processed using digital signal processing to generate an enhanced photon sensor signal with enhanced signal quality by adding gain and/or bandwidth limiting.

System and method for sensitive photon detection

Methods and systems are described for efficiently detecting an object. The system includes at least one electrode for measuring a displacement current. The at least one electrode is coupled to a floating ground configuration provided by an op-amp, where the inverting node of the op-amp is coupled to electrode and the non-inverting node is coupled to a signal generator. The system may include a single capacitance sensor for detecting an object. Systems may include a plurality of capacitance sensors in an array configuration for detecting an object.

Systems and methods for detection of dielectric change in material and structure

Ultrasound induced by RF irradiation within FDA exposure limits is produced with sufficient signal-to-noise ratio to allow acquisition of sub-millimeter resolution images within practical time frames.

Electromagnetic-acoustic imaging

A system that remotely measures displacement between two objects. A passive sensor is affixed between the objects. The internal sensor uses magnetic coupling between two sensor elements to measure their relative displacement. The sensors are either a) a permeable rod and a complimentary coil in parallel with a tuning capacitor; or b) two permeable rods, each having its own surrounding coil and a tuning capacitor. One of the sensor elements is affixed to each object which is to be monitored. When an interrogating device is placed near the sensors, a resonance can be measured whose frequency characteristics change in a reproducible manner with the relative displacement of the sensors. The resulting resonance characteristics can be calibrated in such a way as to enable the displacement of the objects to be determined.

Passive and wireless displacement measuring device

A method of two interferometric configurations to measure bending of an extended element. The measurement arm of each configuration is a long optical fiber. A first interferometric configuration has a segment of its measurement arm attached to one side of the element. The second interferometric configuration has a segment of its measurement arm attached to one side of the element and another segment of its measurement arm attached to an opposing side of the element. The two configurations are used to obtain two sets of interference fringe measurement values. If one set is subtracted from the other, the result is intensity differential values that indicate only the effects of bending and not of temperature or pressure. Variations of the method can be used for irregularly shaped elements.

Dual-interferometer method for measuring bending of materials

A waveguide designed to minimize bend-induced losses. The waveguide has three regions of varying indices of refraction. The indices of refraction are chosen so that the field is a trigonometric function in the core region, evanescent in the intermediate region, and trigonometric again in the outer region. The widths of each region are calculated to further reduce losses.

Optimization of curved waveguide design to reduce transmission losses

A pressure or temperature sensor array utilizing a combination of liquid crystal material and charge coupled device (CCD) sensor array. The device generally comprises a liquid crystal material enclosed in a planar capsule, one side of which has a flexible outer membrane which is placed on the surface whose pressure and/or temperature is to be measured; a light source used to illuminate the liquid crystal material; and a charge coupled device (CCD) array which detects the variations in the optical signature of the liquid crystal material due to changes in pressure or temperature. The device may further include an optical waveguide for controlling transmission of light from the light source to the liquid crystal material.

Growing community of inventors

Mico, TX, United States of America

Stephen Anthony Cerwin