Patent ID: 9007592
Filing Date: 2015-04-14
Classification: G01J,G01N

Abstract:
1. A gas analyzer comprising: an irradiation means for irradiating a laser beam onto a gas to be measured; a laser control means for controlling said laser irradiation means so that the emission wavelength of said laser beam changes over a predetermined wavelength range that includes the center wavelength of the absorption spectrum of a specific gas that is included in said gas to be measured; and a light-receiving means for receiving the laser beam that has been transmitted through said gas to be measured; and further comprising: a) a spectrum creation means for creating an absorption spectrum from detection signals of the laser beam received by said light-receiving means; b) an amount-of-spread measurement means for measuring the amount of spread of a peak of said absorption spectrum; and c) a determination means for determining whether or not said amount of spread falls within a predetermined range which in turn determines whether or not pressure of said gas to be measured falls within a high vacuum region where the absorption spectrum depends solely on temperature and not on pressure.