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Standard for near-infrared reflectance measurement and method of making the same

  • US 4,761,552 A
  • Filed: 09/16/1986
  • Issued: 08/02/1988
  • Est. Priority Date: 09/16/1986
  • Status: Expired due to Fees
First Claim
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1. In combination with an analyzer for quantitative measurements for at least one constituent of interest in a sample by optical measurements, a calibration standard comprising, a calibration standared holder having a cup-shaped cavity closed at one end by an IR-quartz window, a pressed PTFE layer of a predetermined density and thickness in the cavity pressed onto and adjacent the IR-quartz window and having an upper surface substantially parallel to the surface against the IR-quartz window, and a sealing member in the cavity premanently sealing the pressed PTFE layer, the member being of a material which does not affect the optical characteristics of the standard.

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