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Improved electronic gate technique, for particle counting and sizing in liquids

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Abstract

Particle counting and measurements of particle size distributions in liquids can be based on pulse height analysis of signals obtained from a changing gate impedance, upon particle transition. Signal-to-noise ratio is markedly improved, making use of a four-electrode detector. An instrumentation amplifier with a high-pass filter is used as a preamplifier. Cylindrical electrodes and a coaxial aperture location result in a decreased detector capacitance, lowering the signal detection level and contributing to improved pulse shape. Volume sampling is flexible and accurate, making use of a stepping motor acutated digital sampling system. A newly developed baseline restorer, combined with a log-antilog amplifier circuit, allows for linearisation of the pulse height/particle size relationship.

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Authors and Affiliations

  1. Physics Laboratory, Faculty of Medicine, Ghent University, K. L. Legeganckstraat 35, B-9000, Ghent, Belgium

    F. De Bisschop

  2. Electronics & Metrology Laboratory, Ghent University, St Pietersnieuwstraat 41, B-9000, Ghent, Belgium

    H. Lambert & G. De Mey

Authors
  1. F. De Bisschop
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  2. H. Lambert
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  3. G. De Mey
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Additional information

Patents are pending on the devices described in this paper.

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De Bisschop, F., Lambert, H. & De Mey, G. Improved electronic gate technique, for particle counting and sizing in liquids. Med. Biol. Eng. Comput. 29, NS49–NS54 (1991). https://doi.org/10.1007/BF02446102

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  • DOI: https://doi.org/10.1007/BF02446102

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