High resolution device and method for imaging concealed objects within an obscuring medium

Abstract

A method and apparatus are provided for imaging and identifying concealed objects within an obscuring medium using radiation (optical, photo-acoustic, ionizing, and/or acoustic) optimized for imaging (e.g. temporal properties, spectral bandwidth, directionality, polarization, etc.). Radiation propagates through, interacts with, exits the medium and the object, and is detected/imaged. Image quality can be improved if radiation is collimated and/or if transmission and/or backscattered measurements from a number of perspectives are used to improved image reconstruction. Coupling materials can be employed during image acquisition to enhance radiation coupling as well as providing desirable absorption and scattering properties. Contrast materials and agents can also aid in the detection of concealed objects. Adaptive methods, e.g. using reference objects, including implementations based on the concept of guide stars, can improve the imaging process. The surface can be monitored and groomed to enhance the imaging process. Tomosynthesis techniques can be used to reconstruct images. Acousto-optic effects may be observed when both optical radiation and acoustic radiation are introduce into the medium. A laser vibrometry, speckle, or holographic interferometry imaging technique can be used to readout the acoustic waveform exiting the medium surface directly or after interacting with a deformable mirrored or reflective layer coupled to the medium. The medium may be prepared prior to imaging in order to reduce surface irregularities and roughness. Multilayer mirrors and capillary optics can be used to enhance imaging systems which use ionizing radiation. Resistance images can be obtained using probes to penetrate the medium.

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