×

Method of identifying fluorescent materials

  • US 4,105,333 A
  • Filed: 10/04/1976
  • Issued: 08/08/1978
  • Est. Priority Date: 10/17/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. In a method of identifying fluorescent materials which are excited into fluorescence with light of respectively differently damped spectral radiant intensities, and in which a wide-band-radiating light source whose spectrum is selectively damped over a wide band and partially is used to irradiate the fluorescent materials, the different radiant intensities emitted by the fluorescent materials are compared, and such comparison is used for identification of a selected fluorescent material;

  • the improvement comprising the steps of providing a neutral filter uniformly damping the radiation of said light source;

    providing a respective partially absorbing filter damping only the wavelengths necessary to excite the fluorescence of a selected fluorescent material;

    interposing said filters in the path of light rays directed from said light source onto a sample to be checked for the presence of a selected fluorescent material;

    measuring the respective intensities of radiation of the sample effected by said neutral filter and by each partially absorbent filter; and

    converting the measured intensities of radiation into output signals indicative of the presence or absence of the selected fluorescent material.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×