| 摘要 |
A gas permeable probe for use in an optical analyzer for an exhaust gas stream flowing through a duct or chimney comprises: an elongate hollow structure having first and second ends and a side wall, with an optical cavity defined between said first and second ends within said side wall, a mounting structure at said first end and adapted for mounting said elongate hollow structure within said duct or chimney, a support member at said second end, a connecting structure connecting said mounting structure at said first end to said support member at said second end, an optical window at said first end permitting a beam of light originating from an optical analyzer to enter into said optical cavity to travel from said first end to said second end, a filter forming a part of said side wall, and a retroreflector provided at said second end for returning said light beam to said first end of said hollow structure, said optical window being releasably mounted at said first end of said elongate hollow structure and/or said retroreflector being releasably mounted at said second end of said elongate hollow structure.
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