Modulation contrast microscope.

@article{Hoffman1975ModulationCM,
  title={Modulation contrast microscope.},
  author={Robert Hoffman and L M Gross},
  journal={Applied optics},
  year={1975},
  volume={14 5},
  pages={1169-76}
}
A new microscope imaging system, modulation contrast, has been devised that reveals phase gradients; the image intensity is proportional to the first derivative of the optical density in the object. The modulator, a special filter, is placed in the Fourier plane, a plane conjugate with a slit aperture. The image of the slit aperture is registered within a gray region of the modulator; on one side of the gray region is a region of low transmittance and on the other side, a region of maximum… CONTINUE READING
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