| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately detect the collection distribution of particulate matter for absorbing electromagnetic waves such as PM. <P>SOLUTION: Multiple kinds of electromagnetic waves of different frequencies with their transmittances in passing through a filter different to each other are radiated at two or more radiation angles for detecting the intensities of the electromagnetic waves having passed through the filter. Coefficients α, β are set for the multiple kind of electromagnetic waves each for the two or more radiation angles so that the transmittances of the electromagnetic waves having passed through the filter before collection of the PM are the same between the two or more radiation angles. The intensity of an electromagnetic wave with a higher filter transmittance before collection of the PM is selected out of the intensities of the detected multiple electromagnetic waves. The PM collection amount is calculated each for the two or more radiation angles by multiplying the difference between the intensity of the selected electromagnetic wave and the intensities of the electromagnetic waves having passed through the filter before collection of the PM by the coefficients α, β. <P>COPYRIGHT: (C)2011,JPO&INPIT |
