Dust measurement

Details Dust measurement Dust measurement

G - Physics

01

N

73/53

G01N 15/02 (2006.01)

Patent

CA 1135074

ABSTRACT A method for measuring substantially spherical particles, such as dust. Two signals arc formed, one of which is an approximately linear function of the particle concentrat- ion independently of the particle diameter and the second one is an approximately linear function of the particle diameter independently of the particle concentration. In order to obtain these signals the particles are illumin- ated with light in a direction different from their direct- ion of flow. At least two detectors are arranged in such a way that the light in the beam path from the light source (3) to the first detector (6) is substantially only in- fluenced by scattering and by light absorption of the particles and that the light in the beam path from the light source to the second detector (7) passes substant- ially only via reflections against the particles. The two signals are formed by definite relations between the d.c. voltage components of the output signals of the detectors and the average value of the squared R.M.S. value of the a.c. voltage component of the output signal from one of the detectors.

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