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Gas measurement apparatus and the setting method of width of wavelength modulation in gas measurement apparatus
Gas measurement apparatus and the setting method of width of wavelength modulation in gas measurement apparatus
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机译:气体测定装置以及该气体测定装置中的波长调制宽度的设定方法
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摘要
A gas measurement apparatus measures a target gas. The gas measurement apparatus includes a light source, a first light receiving apparatus, a first phase-sensitive detection apparatus, an R calculation unit, and a setting unit. The light source oscillates a laser light that has a central wavelength determined by a main current and is modulated according to a modulation current, with the central wavelength being varied. The first light receiving apparatus outputs a detection signal according to an intensity of the laser light transmitted through a standard sample. The first phase-sensitive detection apparatus obtains a second harmonic component oscillated at a harmonic frequency ω2 twice as large as a modulation frequency ω1. The R calculation unit calculates a peak-bottom ratio R. The setting unit sets a width of wavelength modulation of the laser light so that the peak-bottom ratio R satisfies a predetermined condition.
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