Johns Hopkins University

Kevin C Baldwin

Wayne E Shanks

David W Blodgett

Donald D Duncan

David M Brown

Andrea M Brown

Randall T Hanna

A holography sensor system is provided that includes an illuminator, a backscatter array, an array controller, and processing circuitry. The illuminator may be configured to output an illumination signal into a target volume. The backscatter array may comprise a plurality of backscatter elements. The array controller operably coupled to the backscatter elements, and the array controller may be configured to activate selected backscatter elements to enable the selected backscatter elements to transmit a backscatter signal in response to receipt of the illumination signal. The receiver may be configured to receive the backscatter signals from the selected backscatter elements. The processing circuitry may be configured to receive the backscatter data based on the backscatter signals from the receiver, aggregate the backscatter data with other backscatter data to form a holographic field measurement data set, and generate an image of the target volume based on the holographic field measurement data set.

Large volume holographic imaging systems and associated methods

An optical turbulence measurement system may include a camera assembly, a first optics assembly, a second optics assembly, and processing circuitry. The first optics assembly and the second optics assembly may be configured to magnify and direct a portion of a source beam received by a respective aperture to the camera assembly to be received as a two portions of a received beam. The processing circuitry may be configured to receive, from the camera assembly, a data representation of a first received beam from the first optics assembly and a second received beam from the second optics assembly, determine a focal spot displacement variance based on motion of a first focal spot corresponding to the first received beam relative to a second focal spot corresponding to the second received beam, and measure optical turbulence along a path of the source beam based on the focal spot displacement variance.

Optical turbulence measurement

A means of assessing the internal structure of teeth based upon use of high frequency, highly localized ultrasound (acoustic waves) generated by a short laser pulse is presented. In contrast to traditional contact transducer methods, laser-generated ultrasound is non-contact and non-destructive in nature and requires no special tooth surface preparation. Optical interferometric detection of ultrasound provides a complementary non-destructive, non-contact means for obtaining data with a very small detection footprint. The combination of laser-generated ultrasound and optical interferometric detection allows for in-vivo diagnostics of tooth health that is sensitive to the enamel/dentin, dentin/pulp, and dentin/cementum interfaces as well as a region of dead tracts in the dentin within a tooth.

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Sykesville, MD, United States of America

Kevin C Baldwin