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Light transmittance type analytical system and variable transmittance optical component and test device for use therein

  • US 5,431,880 A
  • Filed: 12/23/1991
  • Issued: 07/11/1995
  • Est. Priority Date: 07/06/1987
  • Status: Expired due to Fees
First Claim
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1. A light transmittance type analytical system for rapid detection of minute amounts of an insoluble substantially opaque colored light absorptive product, said system comprising an optical component comprising a fluid and light permeable matrix of compacted reflective granules which have a light scattering coefficient of at least about eighty that is reducible by contact of said granules by said product, said granules having a light absorption coefficient of substantially zero, there being interstices between adjacent granules of said matrix;

  • means for causing the formation of an insoluble substantially opaque colored light absorptive product in the interstices of at least a portion of said matrix;

    means for subjecting said matrix to incident light; and

    means for monitoring the change in the light transmittance of said matrix caused by the combined effect of direct absorption of light by said product and concomitant reduction of the light scattering coefficient of granules in said matrix contacted by particles of said product.

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