| 摘要 |
This invention provides a dust particle analyzer comprising: A laser producing a light beam polarized in a first plane including said light beam; Means to convert said light beam into a cone light beam of a first small angle; Means to convey a volume of sample air containing dust particles under surveillance onto a highly illuminated region at the apex of said cone light beam; Means to collect light beams scattered forward from said dust particles in a first solid angle surrounded by the inner cone of a second small angle larger than said first small angle and the outer cone of a third small angle, the cosine of which is substantially equal to unity; Means to collect light beams scattered backward from said dust particle in a second solid angle surrounded by the inner cone of said second small angle and the outer cone of said third small angle; Means to produce a first signal which is proportional to the component of said forward scattered light beams polarized in said first plane and in said first solid angle; Means to produce a second signal which is proportional to the component of said scattered light beams polarized in said first plane and in said second solid angle; and Means to count the number of dust particles contained in a volume of said sample air and belonging to the respective groups defined according to the refractive index and the diameter of dust particles determined by said first and second signals.
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