USA As Represented by Secretary of the Navy

Nathan Johnnie

Francis J O'Brien, Jr

Joseph W Robicheau

Helene B Anderson

Lynn T Antonelli

Aimee M Ross

Susan E Maloney

A computer-implemented method to characterize a signal structure is provided. The method may receive a first set of time-dependent data vectors; select a sample size of data vectors; determine a minimum number of lags to process to characterize the first set of data vectors; calculate a cross-product term for each data vector in the sample size for each lag, a mean value and a variance value based on the sum of the cross-product term for each lag; calculate a circular correlation function for each lag; determine an upper and a lower correlation bound for the circular correlation based on the mean value, the variance value, and a desired false alarm rate; and characterize the signal structure based on the number of calculated circular correlation functions that exceed the upper or lower correlation bounds so as to generate a signal characterization data signal.

System and method of use for non-parametric circular autocorrelation for signal processing

A device is provided with integrated hardware and software components for measuring and monitoring abnormalities on animal and human tissue and other surfaces. The device includes a display panel and a control panel secured to the upper surface of a housing and a plurality of sensor arrays attached to the lower surface on two scanner belts. A processor receives input from the sensor arrays to create data objects which are stored in an image object database. A retrieval component retrieves the image objects and identifies attributes to display image and quantitative values on a the display panel. A hardware processing component runs at least one algorithm to determine the area of a surface abnormality. Another hardware processing component is provided to receive user input to update images and to select a deformation region for area calculation.

Surface deformation image analyzer

An electrolyte detector is provided that includes two micrometers which slide relative to each other along a frame to adjust the electrolyte detector to a size of the battery. A transmitter rod and a receiver rod support an acoustic transmitter and an acoustic receiver, respectively, and are slidably mounted with respect to the micrometers. The micrometers measure the position of the transmitter and receiver for placement on the side of the battery at a desired level of electrolyte. A transmitter director and receiver director concentrates the transmission and receipt of acoustic energy to locate the electrolyte level. An electronic circuit analyzes the received signal to determine whether the signal is transmitted through air or through an electrolyte.

Battery electrolyte level detector apparatus

A method for locating defects in a target includes subjecting the target to an ultrasonic vibration. A first laser beam is then transmitted to the target and a reflection is received. A vibration signal is produced from the reflection that gives the target's response to the ultrasonic vibration. A digital image is produced of the target that includes the region of the first laser beam reflection. The digital images are overlaid with the vibration signal to provide overlaid data. The overlaid data is tested to determine a probability of the overlaid data being non-random. The probability is compared against a threshold to indicate a potential area of concern that may include defects.

Method of laser vibration defect analysis

A device for recovery of physical objects includes a chain having two ends and a retriever attached to one of the ends. The retriever is configured to locate the object to be recovered and to grasp and retrieve that object once located. The retriever includes transducers that detect acoustic frequencies propagating in a fluid medium. Independent transponders, which can be deployed from the retriever; are provided for deployment in an area to be searched. Each transponder emits a predetermined acoustic frequency that is detectable by the transducers. The transducers signal movement of the recovery device for retrieval of the object.

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Middletown, RI, United States of America

Nathan Johnnie