A method and apparatus for optically interrogating a particle comprising obtaining a plurality of optical interrogations from a plurality of orientations relative the particle. In one aspect, the particle is tumbled relative to optical interrogation direction and reflected or transmitted energy is collected and added into a single spectrum that represents a complete spectral composition of the sample.

 
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> High efficiency balanced detection interferometer

> Method or x-ray device for creating a series of recordings of medical x-ray images of a patient who might possibly be moving during the recording of the series of images
~ 00506