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Method for determining the average radius and/or the average length of particles carried by a flowing medium

  • US 4,529,309 A
  • Filed: 09/28/1982
  • Issued: 07/16/1985
  • Est. Priority Date: 10/01/1981
  • Status: Expired due to Term
First Claim
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1. A method for determining the average radius and/or the average length of fibers carried by a flowing medium by using at least one radiation source for emitting and directing radiation through the medium in a direction having an angle different from 0°

  • to the direction of flow of the medium, the intensity of the radiation at least during a measuring operation being substantially constant and predetermined;

    first and second radiation detectors for receiving and indicating radiation emitted from respective radiation sources and passing straight through said medium, and for transforming the detected radiation into an electrical signal varying in dependence on the radiation intensity;

    optics disposed between said radiation source and said first detector for limiting the cross section of the radiation passing through the medium emitted by said radiation source and detected by said first detector, said second radiation detector receiving radiation of a larger cross-section then said first radiation detector, and a calculation unit connected to said detectors, which forms two signals DC and AC in accordance with the formulas ##EQU2## where V'"'"'DC and VDC are respectively the direct current voltage portion of the signal from said first detector during measuring of a medium with particles and during measuring of a medium without particles, V2RMS is the square of the true effective value (R.M.S.) of the alternating current voltage portion of the signal from said first detector during measuring of a medium with particles, and c2 is a constant, the determination of the average fiber radius being made by dividing the signal AC from said first radiation detector for radiation having a small cross section by the signal DC provided by said same detector and the determination of the average fiber length being made by dividing the signal AC from said second detector for radiation having a large cross section by the signal AC from said first detector for radiation having a small cross section.

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