Patent ID: 6201245
Filing Date: 2001-03-13
Classification: G01N

Abstract:
An Infrared Gas Analyzer comprising a U-like, tubular optical housing having smooth, highly reflective inner walls for transmitting an infrared beam along the length of the inner walls thereof by internal reflections of the infrared beam entered at one end of the U-like housing and exiting at the other other end of the U-like housing,the U-like housing having open ends at opposite sides of the housing from entry and exits of the housing,a reflective mirror, individually mounted in each of said open ends of the U-like housing for closing said open ends and reflecting an impinging infrared beam through approximately 90 degrees and maintaining the infrared beam wholly within the U-like housing from the entry end of the infrared beam to the exit end of the infrared beam,an infrared source mounted in the entry end the U-like housing and projecting an infrared beam along said housing,an infrared detector mounted in the exit end of the U-like housing for receiving the infrared beam transmitted within said housing providing an electrical output signal representative of the infrared beam impinging thereon, said infrared detector comprises a detector carrying an infrared filter for transmitting a narrow band of the infrared beam to the detector and reflecting the remaining portion thereof, and a second detector mounted in a tubular, reflective arm extending inwardly of the first detector for receiving the reflected infrared portion from the filter of said first detector within said tubular arm whereby multiple gases may be detected with said U-like housing.