首页>
外国专利>
Gas measurement apparatus and method for setting the width of wavelength modulation in a gas measurement apparatus
Gas measurement apparatus and method for setting the width of wavelength modulation in a gas measurement apparatus
展开▼
机译:气体测量设备和用于设定气体测量设备中的波长调制宽度的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
A gas measurement apparatus measures a target gas. The gas measurement apparatus comprises 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.
展开▼