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Retro-reflector assembly and opacity monitor incorporating same

  • US 7,429,112 B2
  • Filed: 05/08/2006
  • Issued: 09/30/2008
  • Est. Priority Date: 06/16/2005
  • Status: Active Grant
First Claim
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1. A retro-reflector assembly for incorporation in an opacity monitor, said assembly comprising several corner-cube prisms each of which is of glass and each of which has a cylindrical external surface by which said prisms are embedded in closely spaced relationship in a metal substrate, which metal substrate either imparts, by its high thermal conductivity, compared with the thermal conductivity of said glass prisms, thermal stability to said assembly, and/or which metal substrate is thermally controlled to attain thermal stability.

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