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Apparatus and method for measuring dust

  • US 10,281,395 B2
  • Filed: 06/16/2017
  • Issued: 05/07/2019
  • Est. Priority Date: 06/16/2016
  • Status: Active Grant
First Claim
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1. An apparatus for measuring dust, comprising:

  • a flow channel unit for defining a flow channel allowing a fluid containing dust to move through;

    a light emitter for emitting light into the flow channel;

    a light detector for detecting light scattered from the dust in the flow channel and converting the detected light scattered from the dust in the flow channel into an electrical detection signal, the light detector comprising a plurality of detectors having different light detection ranges; and

    a controller for controlling the flow channel unit, the light emitter and the light detector,wherein the controller is configured to;

    receive detection signals from the plurality of detectors;

    compensate for an offset for the received detection signals; and

    measure a dust concentration based on the compensated detection signals,wherein, when the controller compensates for the offset for the received detection signals, the controller is further configured to;

    divide the detection signals into a low-concentration section, a discontinuous section and a high-concentration section according to dust concentrations;

    apply, in the low-concentration section, a first detection signal received from a detector having a first light detection range;

    apply, in the high-concentration section, a second detection signal received from a detector having a second light detection range, the second light detection range being narrower than the first light detection range; and

    apply a third detection signal in the discontinuous section, the third detection signal being obtained by increasing a weight of the first detection signal and decreasing a weight of the second detection signal as a concentration point moves toward the low-concentration section and by decreasing the weight of the first detection signal and increasing the weight of the second detection signal as the concentration point moves toward the high-concentration section.

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