Patent ID: 8237926
Filing Date: 2012-08-07
Classification: G01J,G01N

Abstract:
1. A density measuring method for detecting densities of at least one gaseous substance and particulate matter in a measurement object gas containing the at least one gaseous substance and the particulate matter on a basis of transmittance and attenuation of a laser measured by irradiating the laser including a wavelength equivalent to an absorption wavelength peculiar to the at least one gaseous substance through the measurement object gas, the method comprising: establishing a relation between laser attenuation and a density of each particulate matter in response to each absorption wavelength peculiar to each gaseous substance in advance; irradiating a laser having at least one wavelength equivalent to an absorption wavelength peculiar to each gaseous substance to be measured; and determining the density of each particulate matter by measuring the laser attenuation in response to the wavelength of the laser, and comparing the measured attenuation with the attenuation computed by use of the relation established in advance.