LASER OXYGEN GAS ANALYSER

• Main Authors: KANAI HIDEO, HIGASHI RYOICHI
• Format: Patent
• Language: English; Japanese
• Published: 25.12.2014
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a laser oxygen gas analyser which performs concentration measurement using a wavelength indicating sensitivity to a high-temperature oxygen gas contained in a measuring object gas and which does not require heating a gas and a correction gas cell to a high temperature at 400°C or higher in correction and further does not require maintaining the high temperature of the gas and the correction gas cell in field work.SOLUTION: Oxygen concentration can be measured only by a wavelength indicating sensitivity to only a high-temperature measurement gas used in concentration measurement and a wavelength having an absorption intensity sufficient for an adjacent normal temperature oxygen gas. This allows indirect correction of a deviation of the wavelength having sensitivity only to the high-temperature oxygen gas by correcting a deviation caused by a secular change of the wavelength having an absorption intensity sufficient for the normal temperature oxygen gas. Thus, a correction gas and a correction gas cell are not required to be heated to a high temperature, and correction can be made at a normal temperature. 【課題】測定対象ガスに含まれる高温の酸素ガスのみに感度を示す波長を用いて濃度測定を行うレーザ式酸素ガス分析計において、補正時にガスや補正用ガスセルを４００℃以上の高温に熱する必要がなく、かつ、現地作業時にガスや補正用ガスセルを高温に維持にする必要がない、レーザ式酸素ガス分析計を提供する。【解決手段】濃度測定に使用する高温の測定ガスのみに感度を示す波長と、隣接した常温の酸素ガスに対し十分な吸収強度をもつ波長と、による酸素濃度を測定できるようにする。これにより、常温の酸素ガスに対し十分な吸収強度をもつ波長の経時変化によるズレを補正することで高温の酸素ガスのみに感度を示す波長のズレを間接的に補正できるため、補正用のガスや補正用ガスセルを高温に熱する必要なく、常温で補正することが可能になる。【選択図】図５