Abstract: Mechanisms for identifying a characteristic of a material. An X-ray signal is generated. The X-ray signal is modulated with at least two radio frequency modulation signals to form a modulated X-ray signal. The modulated X-ray signal is directed toward a target material. A backscatter signal is received from the target material, the backscatter signal including harmonic components generated by the target material in response to receiving the modulated X-ray signal. Based at least in part on the harmonic components, a characteristic of the target material is identified.

Abstract: Mechanisms for identifying a characteristic of a material. An X-ray signal is generated. The X-ray signal is modulated with at least two radio frequency modulation signals to form a modulated X-ray signal. The modulated X-ray signal is directed toward a target material. A backscatter signal is received from the target material, the backscatter signal including harmonic components generated by the target material in response to receiving the modulated X-ray signal. Based at least in part on the harmonic components, a characteristic of the target material is identified.

Abstract: The present disclosure presents, in various aspects and embodiments, a 3D X-ray microscopy imaging technique. Some aspects are directed to various embodiments of an apparatus for use in such a technique, such as an X-ray microscopy imaging system. Other aspects are directed to various embodiments of a method for use in such a technique, like a method for generating an X-ray image that has a grayscale response proportional to range. Some, though not all, aspects of the technique are computer-implemented, and so include encoded program storage media, programmed computing apparatuses, and computer-implemented methods.

Abstract: A method and apparatus for use in generating and imparting a low frequency, directed energy wavefield are disclosed. In a first aspect, the presently disclosed technique includes a low frequency directional array, comprising: a plurality of array elements capable of generating a low frequency, directed energy wavefront; and a canceling element capable of actively canceling a spurious lobe of the wavefront. In a second aspect, the presently disclosed technique includes a method, comprising: imparting a low frequency, directed wavefront; and actively canceling a spurious lobe of the wavefront.