Patent ID: 6661011
Filing Date: 2003-12-09
Classification: G01N

Abstract:
A gas analyzer comprising:a light source system including an infrared light source and a reflector for providing a parallel infrared light beam; a cassette-type light path system including a cassette, an optical absorption chamber, and a set of concave mirrors, wherein: the cassette includes a first surface, a second surface, a first side having a first section and a second section, a second side, a third side, and a fourth side, and a vent hole set including a plurality of vent holes, alternately disposed on the first surface and the opposite second surface and enclosed by an O-ring that is provided for sealing a gas component contained in the cassette, for uniformly distributing the gas component to be tested, wherein an inlet and an outlet are provided respectively in the first and the second sections of the first side for respectively inputting and outputting the parallel infrared light beam; the optical absorption chamber is for guiding the gas component to be tested and for providing an extended space for contact between the gas component and the parallel infrared light beam, an inner wall of the optical absorption chamber being coated with a highly reflective coating film; and the set of concave mirrors includes a first concave mirror, a second concave mirror, and a third concave mirror alternately disposed on the first side and the opposite second side for guiding the parallel infrared light beam and extending a light path of the parallel infrared light beam; an optical folding system including a beam splitter and a deflector for guiding the parallel infrared light beam, wherein each of the beam splitter and the deflector is coated with a highly reflective coating film; and an infrared detecting system including a reference detector and a measuring detector, each of which includes a filter and a sensor, wherein since the filter in the reference detector and the filter in the measuring detector induce infrared light beams having close but distinct frequencies, they are distinct detectors while the sensor in the reference detector and the sensor in the measuring detector are identical.