×

Method and apparatus for eliminating the effects of varying sample distance on optical measurements

  • US 5,801,817 A
  • Filed: 05/05/1997
  • Issued: 09/01/1998
  • Est. Priority Date: 05/05/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for eliminating effects of varying sample distance on optical measurements, comprising the steps of:

  • a) placing a measurement sample at an actual position, wherein said actual position may differ from a desired, nominal position;

    b) providing a light source in front of the measurement sample;

    c) providing a source lens assembly between the light source and the measurement sample, wherein a source focal point of the source lens assembly lies on one side of the measurement sample;

    d) providing a light detector in front of the measurement sample; and

    e) providing a detector lens assembly between the detector and the measurement sample, wherein a detector focal point of the detector lens assembly lies on another side of the measurement sample.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×