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(1 - 3 of 3)
- Title
- Method of and an Apparatus for Counting Fibers
- Creator
- Davies, Reg, Karuhn, Richard F.
- Date
- 2009-05-09, 1974-10-24
- Description
-
A method and apparatus are provided for distinguishing microscopic size, elongated fiber-like particles from cubically shaped, irregularly...
Show moreA method and apparatus are provided for distinguishing microscopic size, elongated fiber-like particles from cubically shaped, irregularly shaped, or spherically shaped particles in a mixture suspended in an electrically conducting liquid medium and for counting the fiber-like particles. In accordance with the method, an electrical zone sensing apparatus is provided with a screen means having microscopic openings therein of predetermined size to filter from the suspension particles having an effective area larger than the size of screen openings. Particles passing through the screen and through the sensing aperture of the zone sensing apparatus are separately sized by volume characteristics of electrical signals generated. The electrical signals having predetermined volume characteristics associated with the maximum spherical particles for passing through the screen openings are counted as non-fiber particles; whereas signals having larger volume characteristics are separately counted and designated as fibers. By the use of screens of successively smaller sizes, the larger particles including fibers having larger transverse cross sections may be successively filtered from the suspension and from reaching the sensing aperture. Therefore, smaller fibers having smaller cross-sectional area may be distinguished from particles having diameters approximating that of the smaller screen size openings.
Sponsorship: IIT Research Institute
United States Patent
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- Title
- Method and Apparatus for Detecting and Sizing Microscopic Particles
- Creator
- Karuhn, Richard F., Davies, Reg, Clinch, John Michael
- Date
- 2009-04-30, 1973-06-12
- Description
-
Improved accuracy of size measurement and size distribution of particles in a fluid have been obtained in an electrical zone sensing apparatus...
Show moreImproved accuracy of size measurement and size distribution of particles in a fluid have been obtained in an electrical zone sensing apparatus by a flow control director means which directs the fluid in a more streamlined, less turbulent flow through an aperture at which the particles are electrically sensed. Also, the particles were directed and guided to flow substantially parallel to longitudinal axis for the aperture. The preferred flow control detector means comprises a contoured orifice having a smooth tapered inlet wall blended at an intersection with a central cylindrical wall defining a tubular shaped aperture.
Sponsorship: IIT Research Institute
United States Patent
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- Title
- Particle Sensing Apparatus, Method and Flow Direction Collar Therefor
- Creator
- Karuhn, Richard F., Davies, Reg, Kaye, Brian Howard
- Date
- 2009-04-30, 1973-06-12
- Description
-
A flow direction collar is positionable in an electrical zone sensing apparatus with an elongated bore therein disposed in substantial...
Show moreA flow direction collar is positionable in an electrical zone sensing apparatus with an elongated bore therein disposed in substantial alignment with an aperture through which particles carried by a liquid pass while being electrically sensed. The collar is positioned immediately upstream of the aperture to cause a directional flow of the liquid along a path substantially parallel to a longitudinal axis for the aperture. The flow through the collar directs the particles to flow along paths substantially parallel to the aperture axis thereby reducing the turbulence about the particle created by abrupt changes in velocity. Preferably, the collar includes a housing for telescoping on the bottom of a detection tube.
Sponsorship: IIT Research Institute
United States Patent
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