公开(公告)号：DE69824627D1

公开(公告)日：2004-07-22

申请号：DE69824627

申请日：1998-12-04

Applicant: MEGGITT AVIONICS INC

Inventor： CUSACK E ,  JUBINVILLE LEO ,  PLIMPTON C ,  STEBBINGS KEITH

IPC: F01D17/02 ,  F01D21/00 ,  F02C9/00 ,  F23N5/08 ,  G01J5/00 ,  H05H1/00 ,  G01J3/443 ,  C21C5/46 ,  G02B6/22

Abstract: A method of detecting an amount of a contaminant in an enclosure, the method comprising: detecting (S7) a first amplitude of energy within a first wavelength band of a first width centered about an emission wavelength of the contaminant, the method characterized by: detecting (S8) a second amplitude of energy within a second wavelength band of a second width larger than the first width, the second wavelength band also centered about the emission wavelength of the contaminant; determining (218) a ratio of the first amplitude of energy to the second amplitude of energy; and comparing (220) the ratio to a known threshold to determine the amount of contaminant in the enclosure.