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X-ray thickness gauge

  • US 5,619,548 A
  • Filed: 08/11/1995
  • Issued: 04/08/1997
  • Est. Priority Date: 08/11/1995
  • Status: Expired due to Term
First Claim
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1. A device for measuring properties of a thin-film disposed on a layered structure using scattering X-rays, said device comprising:

  • a source adapted to produce X-rays;

    a curved surface positioned between said source and said thin-film, with the surface being in fixed orientation with respect to the layered structure and adapted to focus the X-rays onto a first focal area of the layered structure with one point of said area having X-rays impinging thereon at varying angles of incidence, with a reflected X-ray being associated with each of said plurality of X-rays;

    a detector positioned to sense said reflected X-rays, said detector adapted to produce a signal corresponding to an angle of reflection and an intensity of each of the reflected X-rays sensed; and

    a processor means, connected to receive signals produced by the detector, for determining properties of the thin-film based upon a comparison of the intensity and the angle of reflection of the reflected X-rays sensed, the properties including thin-film thickness.

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