FIELD: physics.
SUBSTANCE: proposed method consists in emission of light pulses by two LEDs and reception of said pulses reflected from boards by photo receiver comprising one detector. For comparison, one more channel is introduced with pre-applied substance sample that represents maximum possible concentration of dry substance per unit area for certain volume. Photo receiver registers both reflected light fluxes coming at angle to emission optical axis and compares it by subtraction to reveal maximum dust concentration level.
EFFECT: indication of tolerable level of dust concentration that causes leak currents.
2 dwg
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