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Method and apparatus for aligning microbeads in order to interrogate the same

  • US 7,399,643 B2
  • Filed: 09/12/2003
  • Issued: 07/15/2008
  • Est. Priority Date: 09/12/2002
  • Status: Active Grant
First Claim
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1. A method for aligning microbeads to be read by a code reading or other detection device, comprising:

  • providing microbeads to a positioning device, each microbead having an elongated body with a holographic code disposed thereon or therein, the code being oriented to extend along a longitudinal axis of the corresponding microbead and being defined at least in part by variation of a refractive index of the microbead, the refractive index varying in an axial direction along the longitudinal axis of the microbead; and

    aligning the microbeads with the positioning device so the codes, the variation in the refractive index of the codes, and the longitudinal axis of the microbeads are in a common fixed orientation relative to the code reading or other detection device.

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